/*******************************************************************************************
NSString
*******************************************************************************************/
//一、NSString
/*----------------创建字符串的方法----------------*/
//1、创建常量字符串。
NSString *astring = @"This is a String!";
//2、创建空字符串，给予赋值。
NSString *astring = [[NSString alloc] init];
astring = @"This is a String!";
[astring release];
NSLog(@"astring:%@",astring);
//
NSString *astring = [[NSString alloc] init];
NSLog(@"0x%.8x", astring);
astring=@"This is a String!";
NSLog(@"0x%.8x", astring);
[astring release];
NSLog(@"astring:%@",astring);
//3、在以上方法中，提升速度:initWithString方法
NSString *astring = [[NSString alloc] initWithString:@"This is a String!"];
NSLog(@"astring:%@",astring);
[astring release];
//4、用标准c创建字符串:initWithCString方法
char *Cstring = "This is a String!";
NSString *astring = [[NSString alloc] initWithCString:Cstring];
NSLog(@"astring:%@",astring);
[astring release];
//5、创建格式化字符串:占位符（由一个%加一个字符组成）
int i = 1;
int j = 2;
NSString *astring = [[NSString alloc] initWithString:[NSString stringWithFormat:@"%d.This is %i string!",i,j]];
NSLog(@"astring:%@",astring);
[astring release];
//6、创建临时字符串
NSString *astring;
astring = [NSString stringWithCString:"This is a temporary string"];
NSLog(@"astring:%@",astring);
/*----------------从文件读取字符串:initWithContentsOfFile方法----------------*/
NSString *path = @"astring.text";
NSString *astring = [[NSString alloc] initWithContentsOfFile:path];
NSLog(@"astring:%@",astring);
[astring release];
/*----------------写字符串到文件:writeToFile方法----------------*/
NSString *astring = [[NSString alloc] initWithString:@"This is a String!"];
NSLog(@"astring:%@",astring);
NSString *path = @"astring.text";
[astring writeToFile: path atomically: YES];
[astring release];
/*----------------比较两个字符串----------------*/
//用C比较:strcmp函数
char string1[] = "string!";
char string2[] = "string!";
if(strcmp(string1, string2) = = 0)
{
NSLog(@"1");
}
//isEqualToString方法
NSString *astring01 = @"This is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 isEqualToString:astring02];
NSLog(@"result:%d",result);
//compare方法(comparer返回的三种值)
NSString *astring01 = @"This is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 compare:astring02] = = NSOrderedSame;
NSLog(@"result:%d",result);
//NSOrderedSame判断两者内容是否相同
NSString *astring01 = @"This is a String!";
NSString *astring02 = @"this is a String!";
BOOL result = [astring01 compare:astring02] = = NSOrderedAscending;
NSLog(@"result:%d",result);
//NSOrderedAscending判断两对象值的大小(按字母顺序进行比较，astring02大于astring01为真)
NSString *astring01 = @"this is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 compare:astring02] = = NSOrderedDescending;
NSLog(@"result:%d",result);
//NSOrderedDescending判断两对象值的大小(按字母顺序进行比较，astring02小于astring01为真)
//不考虑大小写比较字符串1
NSString *astring01 = @"this is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 caseInsensitiveCompare:astring02] = = NSOrderedSame;
NSLog(@"result:%d",result);
//NSOrderedDescending判断两对象值的大小(按字母顺序进行比较，astring02小于astring01为真)
//不考虑大小写比较字符串2
NSString *astring01 = @"this is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 compare:astring02
options:NSCaseInsensitiveSearch | NSNumericSearch] = = NSOrderedSame;
NSLog(@"result:%d",result);
//NSCaseInsensitiveSearch:不区分大小写比较 NSLiteralSearch:进行完全比较，区分大小写 NSNumericSearch:比较字符串的字符个数，而不是字符值。
/*----------------改变字符串的大小写----------------*/
NSString *string1 = @"A String";
NSString *string2 = @"String";
NSLog(@"string1:%@",[string1 uppercaseString]);//大写
NSLog(@"string2:%@",[string2 lowercaseString]);//小写
NSLog(@"string2:%@",[string2 capitalizedString]);//首字母大小
/*----------------在串中搜索子串----------------*/
NSString *string1 = @"This is a string";
NSString *string2 = @"string";
NSRange range = [string1 rangeOfString:string2];
int location = range.location;
int leight = range.length;
NSString *astring = [[NSString alloc] initWithString:[NSString stringWithFormat:@"Location:%i,Leight:%i",location,leight]];
NSLog(@"astring:%@",astring);
[astring release];
/*----------------抽取子串 ----------------*/
//-substringToIndex: 从字符串的开头一直截取到指定的位置，但不包括该位置的字符
NSString *string1 = @"This is a string";
NSString *string2 = [string1 substringToIndex:3];
NSLog(@"string2:%@",string2);
//-substringFromIndex: 以指定位置开始（包括指定位置的字符），并包括之后的全部字符
NSString *string1 = @"This is a string";
NSString *string2 = [string1 substringFromIndex:3];
NSLog(@"string2:%@",string2);
//-substringWithRange: //按照所给出的位置，长度，任意地从字符串中截取子串
NSString *string1 = @"This is a string";
NSString *string2 = [string1 substringWithRange:NSMakeRange(0, 4)];
NSLog(@"string2:%@",string2);
//扩展路径
NSString *Path = @"~/NSData.txt";
NSString *absolutePath = [Path stringByExpandingTildeInPath];
NSLog(@"absolutePath:%@",absolutePath);
NSLog(@"Path:%@",[absolutePath stringByAbbreviatingWithTildeInPath]);
//文件扩展名
NSString *Path = @"~/NSData.txt";
NSLog(@"Extension:%@",[Path pathExtension]);
/*******************************************************************************************
NSMutableString
*******************************************************************************************/
/*---------------给字符串分配容量----------------*/
//stringWithCapacity:
NSMutableString *String;
String = [NSMutableString stringWithCapacity:40];
/*---------------在已有字符串后面添加字符----------------*/
//appendString: and appendFormat:
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
//[String1 appendString:@", I will be adding some character"];
[String1 appendFormat:[NSString stringWithFormat:@", I will be adding some character"]];
NSLog(@"String1:%@",String1);
*/
/*--------在已有字符串中按照所给出范围和长度删除字符------*/
/*
//deleteCharactersInRange:
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
[String1 deleteCharactersInRange:NSMakeRange(0, 5)];
NSLog(@"String1:%@",String1);
/*--------在已有字符串后面在所指定的位置中插入给出的字符串------*/
//-insertString: atIndex:
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
[String1 insertString:@"Hi! " atIndex:0];
NSLog(@"String1:%@",String1);
/*--------将已有的空符串换成其它的字符串------*/
//-setString:
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
[String1 setString:@"Hello Word!"];
NSLog(@"String1:%@",String1);
/*--------按照所给出的范围，和字符串替换的原有的字符------*/
//-setString:
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
[String1 replaceCharactersInRange:NSMakeRange(0, 4) withString:@"That"];
NSLog(@"String1:%@",String1);
/*-------------判断字符串内是否还包含别的字符串(前缀，后缀)-------------*/
//01：检查字符串是否以另一个字符串开头- (BOOL) hasPrefix: (NSString *) aString;
NSString *String1 = @"NSStringInformation.txt";
[String1 hasPrefix:@"NSString"] = = 1 ? NSLog(@"YES") : NSLog(@"NO");
[String1 hasSuffix:@".txt"] = = 1 ? NSLog(@"YES") : NSLog(@"NO");
//02：查找字符串某处是否包含其它字符串 - (NSRange) rangeOfString: (NSString *) aString，这一点前面在串中搜索子串用到过;
/*******************************************************************************************
NSArray
*******************************************************************************************/
/*---------------------------创建数组------------------------------*/
//NSArray *array = [[NSArray alloc] initWithObjects:
@"One",@"Two",@"Three",@"Four",nil];
self.dataArray = array;
[array release];
//- (unsigned) Count;数组所包含对象个数；
NSLog(@"self.dataArray cound:%d",[self.dataArray count]);
//- (id) objectAtIndex: (unsigned int) index;获取指定索引处的对象;
NSLog(@"self.dataArray cound 2:%@",[self.dataArray objectAtIndex:2]);
/*--------------------------从一个数组拷贝数据到另一数组(可变数级)----------------------------*/
//arrayWithArray:
//NSArray *array1 = [[NSArray alloc] init];
NSMutableArray *MutableArray = [[NSMutableArray alloc] init];
NSArray *array = [NSArray arrayWithObjects:
@"a",@"b",@"c",nil];
NSLog(@"array:%@",array);
MutableArray = [NSMutableArray arrayWithArray:array];
NSLog(@"MutableArray:%@",MutableArray);
array1 = [NSArray arrayWithArray:array];
NSLog(@"array1:%@",array1);
//Copy
//id obj;
NSMutableArray *newArray = [[NSMutableArray alloc] init];
NSArray *oldArray = [NSArray arrayWithObjects:
@"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
NSLog(@"oldArray:%@",oldArray);
for(int i = 0; i < [oldArray count]; i++)
{
obj = [[oldArray objectAtIndex:i] copy];
[newArray addObject: obj];
}
//
NSLog(@"newArray:%@", newArray);
[newArray release];
//快速枚举
//NSMutableArray *newArray = [[NSMutableArray alloc] init];
NSArray *oldArray = [NSArray arrayWithObjects:
@"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
NSLog(@"oldArray:%@",oldArray);
for(id obj in oldArray)
{
[newArray addObject: obj];
}
//
NSLog(@"newArray:%@", newArray);
[newArray release];
//Deep copy
//NSMutableArray *newArray = [[NSMutableArray alloc] init];
NSArray *oldArray = [NSArray arrayWithObjects:
@"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
NSLog(@"oldArray:%@",oldArray);
newArray = (NSMutableArray*)CFPropertyListCreateDeepCopy(kCFAllocatorDefault, (CFPropertyListRef)oldArray, kCFPropertyListMutableContainers);
NSLog(@"newArray:%@", newArray);
[newArray release];
//Copy and sort
//NSMutableArray *newArray = [[NSMutableArray alloc] init];
NSArray *oldArray = [NSArray arrayWithObjects:
@"b",@"a",@"e",@"d",@"c",@"f",@"h",@"g",nil];
NSLog(@"oldArray:%@",oldArray);
NSEnumerator *enumerator;
enumerator = [oldArray objectEnumerator];
id obj;
while(obj = [enumerator nextObject])
{
[newArray addObject: obj];
}
[newArray sortUsingSelector:@selector(compare:)];
NSLog(@"newArray:%@", newArray);
[newArray release];
NSString
*******************************************************************************************/
//一、NSString
/*----------------创建字符串的方法----------------*/
//1、创建常量字符串。
NSString *astring = @"This is a String!";
//2、创建空字符串，给予赋值。
NSString *astring = [[NSString alloc] init];
astring = @"This is a String!";
[astring release];
NSLog(@"astring:%@",astring);
//
NSString *astring = [[NSString alloc] init];
NSLog(@"0x%.8x", astring);
astring=@"This is a String!";
NSLog(@"0x%.8x", astring);
[astring release];
NSLog(@"astring:%@",astring);
//3、在以上方法中，提升速度:initWithString方法
NSString *astring = [[NSString alloc] initWithString:@"This is a String!"];
NSLog(@"astring:%@",astring);
[astring release];
//4、用标准c创建字符串:initWithCString方法
char *Cstring = "This is a String!";
NSString *astring = [[NSString alloc] initWithCString:Cstring];
NSLog(@"astring:%@",astring);
[astring release];
//5、创建格式化字符串:占位符（由一个%加一个字符组成）
int i = 1;
int j = 2;
NSString *astring = [[NSString alloc] initWithString:[NSString stringWithFormat:@"%d.This is %i string!",i,j]];
NSLog(@"astring:%@",astring);
[astring release];
//6、创建临时字符串
NSString *astring;
astring = [NSString stringWithCString:"This is a temporary string"];
NSLog(@"astring:%@",astring);
/*----------------从文件读取字符串:initWithContentsOfFile方法----------------*/
NSString *path = @"astring.text";
NSString *astring = [[NSString alloc] initWithContentsOfFile:path];
NSLog(@"astring:%@",astring);
[astring release];
/*----------------写字符串到文件:writeToFile方法----------------*/
NSString *astring = [[NSString alloc] initWithString:@"This is a String!"];
NSLog(@"astring:%@",astring);
NSString *path = @"astring.text";
[astring writeToFile: path atomically: YES];
[astring release];
/*----------------比较两个字符串----------------*/
//用C比较:strcmp函数
char string1[] = "string!";
char string2[] = "string!";
if(strcmp(string1, string2) = = 0)
{
NSLog(@"1");
}
//isEqualToString方法
NSString *astring01 = @"This is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 isEqualToString:astring02];
NSLog(@"result:%d",result);
//compare方法(comparer返回的三种值)
NSString *astring01 = @"This is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 compare:astring02] = = NSOrderedSame;
NSLog(@"result:%d",result);
//NSOrderedSame判断两者内容是否相同
NSString *astring01 = @"This is a String!";
NSString *astring02 = @"this is a String!";
BOOL result = [astring01 compare:astring02] = = NSOrderedAscending;
NSLog(@"result:%d",result);
//NSOrderedAscending判断两对象值的大小(按字母顺序进行比较，astring02大于astring01为真)
NSString *astring01 = @"this is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 compare:astring02] = = NSOrderedDescending;
NSLog(@"result:%d",result);
//NSOrderedDescending判断两对象值的大小(按字母顺序进行比较，astring02小于astring01为真)
//不考虑大小写比较字符串1
NSString *astring01 = @"this is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 caseInsensitiveCompare:astring02] = = NSOrderedSame;
NSLog(@"result:%d",result);
//NSOrderedDescending判断两对象值的大小(按字母顺序进行比较，astring02小于astring01为真)
//不考虑大小写比较字符串2
NSString *astring01 = @"this is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 compare:astring02
options:NSCaseInsensitiveSearch | NSNumericSearch] = = NSOrderedSame;
NSLog(@"result:%d",result);
//NSCaseInsensitiveSearch:不区分大小写比较 NSLiteralSearch:进行完全比较，区分大小写 NSNumericSearch:比较字符串的字符个数，而不是字符值。
/*----------------改变字符串的大小写----------------*/
NSString *string1 = @"A String";
NSString *string2 = @"String";
NSLog(@"string1:%@",[string1 uppercaseString]);//大写
NSLog(@"string2:%@",[string2 lowercaseString]);//小写
NSLog(@"string2:%@",[string2 capitalizedString]);//首字母大小
/*----------------在串中搜索子串----------------*/
NSString *string1 = @"This is a string";
NSString *string2 = @"string";
NSRange range = [string1 rangeOfString:string2];
int location = range.location;
int leight = range.length;
NSString *astring = [[NSString alloc] initWithString:[NSString stringWithFormat:@"Location:%i,Leight:%i",location,leight]];
NSLog(@"astring:%@",astring);
[astring release];
/*----------------抽取子串 ----------------*/
//-substringToIndex: 从字符串的开头一直截取到指定的位置，但不包括该位置的字符
NSString *string1 = @"This is a string";
NSString *string2 = [string1 substringToIndex:3];
NSLog(@"string2:%@",string2);
//-substringFromIndex: 以指定位置开始（包括指定位置的字符），并包括之后的全部字符
NSString *string1 = @"This is a string";
NSString *string2 = [string1 substringFromIndex:3];
NSLog(@"string2:%@",string2);
//-substringWithRange: //按照所给出的位置，长度，任意地从字符串中截取子串
NSString *string1 = @"This is a string";
NSString *string2 = [string1 substringWithRange:NSMakeRange(0, 4)];
NSLog(@"string2:%@",string2);
//扩展路径
NSString *Path = @"~/NSData.txt";
NSString *absolutePath = [Path stringByExpandingTildeInPath];
NSLog(@"absolutePath:%@",absolutePath);
NSLog(@"Path:%@",[absolutePath stringByAbbreviatingWithTildeInPath]);
//文件扩展名
NSString *Path = @"~/NSData.txt";
NSLog(@"Extension:%@",[Path pathExtension]);
/*******************************************************************************************
NSMutableString
*******************************************************************************************/
/*---------------给字符串分配容量----------------*/
//stringWithCapacity:
NSMutableString *String;
String = [NSMutableString stringWithCapacity:40];
/*---------------在已有字符串后面添加字符----------------*/
//appendString: and appendFormat:
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
//[String1 appendString:@", I will be adding some character"];
[String1 appendFormat:[NSString stringWithFormat:@", I will be adding some character"]];
NSLog(@"String1:%@",String1);
*/
/*--------在已有字符串中按照所给出范围和长度删除字符------*/
/*
//deleteCharactersInRange:
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
[String1 deleteCharactersInRange:NSMakeRange(0, 5)];
NSLog(@"String1:%@",String1);
/*--------在已有字符串后面在所指定的位置中插入给出的字符串------*/
//-insertString: atIndex:
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
[String1 insertString:@"Hi! " atIndex:0];
NSLog(@"String1:%@",String1);
/*--------将已有的空符串换成其它的字符串------*/
//-setString:
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
[String1 setString:@"Hello Word!"];
NSLog(@"String1:%@",String1);
/*--------按照所给出的范围，和字符串替换的原有的字符------*/
//-setString:
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
[String1 replaceCharactersInRange:NSMakeRange(0, 4) withString:@"That"];
NSLog(@"String1:%@",String1);
/*-------------判断字符串内是否还包含别的字符串(前缀，后缀)-------------*/
//01：检查字符串是否以另一个字符串开头- (BOOL) hasPrefix: (NSString *) aString;
NSString *String1 = @"NSStringInformation.txt";
[String1 hasPrefix:@"NSString"] = = 1 ? NSLog(@"YES") : NSLog(@"NO");
[String1 hasSuffix:@".txt"] = = 1 ? NSLog(@"YES") : NSLog(@"NO");
//02：查找字符串某处是否包含其它字符串 - (NSRange) rangeOfString: (NSString *) aString，这一点前面在串中搜索子串用到过;
/*******************************************************************************************
NSArray
*******************************************************************************************/
/*---------------------------创建数组------------------------------*/
//NSArray *array = [[NSArray alloc] initWithObjects:
@"One",@"Two",@"Three",@"Four",nil];
self.dataArray = array;
[array release];
//- (unsigned) Count;数组所包含对象个数；
NSLog(@"self.dataArray cound:%d",[self.dataArray count]);
//- (id) objectAtIndex: (unsigned int) index;获取指定索引处的对象;
NSLog(@"self.dataArray cound 2:%@",[self.dataArray objectAtIndex:2]);
/*--------------------------从一个数组拷贝数据到另一数组(可变数级)----------------------------*/
//arrayWithArray:
//NSArray *array1 = [[NSArray alloc] init];
NSMutableArray *MutableArray = [[NSMutableArray alloc] init];
NSArray *array = [NSArray arrayWithObjects:
@"a",@"b",@"c",nil];
NSLog(@"array:%@",array);
MutableArray = [NSMutableArray arrayWithArray:array];
NSLog(@"MutableArray:%@",MutableArray);
array1 = [NSArray arrayWithArray:array];
NSLog(@"array1:%@",array1);
//Copy
//id obj;
NSMutableArray *newArray = [[NSMutableArray alloc] init];
NSArray *oldArray = [NSArray arrayWithObjects:
@"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
NSLog(@"oldArray:%@",oldArray);
for(int i = 0; i < [oldArray count]; i++)
{
obj = [[oldArray objectAtIndex:i] copy];
[newArray addObject: obj];
}
//
NSLog(@"newArray:%@", newArray);
[newArray release];
//快速枚举
//NSMutableArray *newArray = [[NSMutableArray alloc] init];
NSArray *oldArray = [NSArray arrayWithObjects:
@"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
NSLog(@"oldArray:%@",oldArray);
for(id obj in oldArray)
{
[newArray addObject: obj];
}
//
NSLog(@"newArray:%@", newArray);
[newArray release];
//Deep copy
//NSMutableArray *newArray = [[NSMutableArray alloc] init];
NSArray *oldArray = [NSArray arrayWithObjects:
@"a",@"b",@"c",@"d",@"e",@"f",@"g",@"h",nil];
NSLog(@"oldArray:%@",oldArray);
newArray = (NSMutableArray*)CFPropertyListCreateDeepCopy(kCFAllocatorDefault, (CFPropertyListRef)oldArray, kCFPropertyListMutableContainers);
NSLog(@"newArray:%@", newArray);
[newArray release];
//Copy and sort
//NSMutableArray *newArray = [[NSMutableArray alloc] init];
NSArray *oldArray = [NSArray arrayWithObjects:
@"b",@"a",@"e",@"d",@"c",@"f",@"h",@"g",nil];
NSLog(@"oldArray:%@",oldArray);
NSEnumerator *enumerator;
enumerator = [oldArray objectEnumerator];
id obj;
while(obj = [enumerator nextObject])
{
[newArray addObject: obj];
}
[newArray sortUsingSelector:@selector(compare:)];
NSLog(@"newArray:%@", newArray);
[newArray release];
/*---------------------------切分数组------------------------------*/
//从字符串分割到数组－ componentsSeparatedByString:
NSString *string = [[NSString alloc] initWithString:@"One,Two,Three,Four"];
NSLog(@"string:%@",string);
NSArray *array = [string componentsSeparatedByString:@","];
NSLog(@"array:%@",array);
[string release];
//从数组合并元素到字符串- componentsJoinedByString:
NSArray *array = [[NSArray alloc] initWithObjects:@"One",@"Two",@"Three",@"Four",nil];
NSString *string = [array componentsJoinedByString:@","];
NSLog(@"string:%@",string);
/*******************************************************************************************
NSMutableArray
*******************************************************************************************/
/*---------------给数组分配容量----------------*/
//NSArray *array;
array = [NSMutableArray arrayWithCapacity:20];
/*--------------在数组末尾添加对象----------------*/
//- (void) addObject: (id) anObject;
//NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
[array addObject:@"Four"];
NSLog(@"array:%@",array);
/*--------------删除数组中指定索引处对象----------------*/
//-(void) removeObjectAtIndex: (unsigned) index;
//NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
[array removeObjectAtIndex:1];
NSLog(@"array:%@",array);
/*-------------数组枚举---------------*/
//- (NSEnumerator *)objectEnumerator;从前向后
//NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
NSEnumerator *enumerator;
enumerator = [array objectEnumerator];
id thingie;
while (thingie = [enumerator nextObject]) {
NSLog(@"thingie:%@",thingie);
}
//- (NSEnumerator *)reverseObjectEnumerator;从后向前
//NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
NSEnumerator *enumerator;
enumerator = [array reverseObjectEnumerator];
id object;
while (object = [enumerator nextObject]) {
NSLog(@"object:%@",object);
}
//快速枚举
//NSMutableArray *array = [NSMutableArray arrayWithObjects:
@"One",@"Two",@"Three",nil];
for(NSString *string in array)
{
NSLog(@"string:%@",string);
}
/*******************************************************************************************
NSDictionary
*******************************************************************************************/
/*------------------------------------创建字典------------------------------------*/
//- (id) initWithObjectsAndKeys;
//NSDictionary *dictionary = [[NSDictionary alloc] initWithObjectsAndKeys:@"One",@"1",@"Two",@"2",@"Three",@"3",nil];
NSString *string = [dictionary objectForKey:@"One"];
NSLog(@"string:%@",string);
NSLog(@"dictionary:%@",dictionary);
[dictionary release];
/*******************************************************************************************
NSMutableDictionary
*******************************************************************************************/
/*------------------------------------创建可变字典------------------------------------*/
//创建
NSMutableDictionary *dictionary = [NSMutableDictionary dictionary];
//添加字典
[dictionary setObject:@"One" forKey:@"1"];
[dictionary setObject:@"Two" forKey:@"2"];
[dictionary setObject:@"Three" forKey:@"3"];
[dictionary setObject:@"Four" forKey:@"4"];
NSLog(@"dictionary:%@",dictionary);
//删除指定的字典
[dictionary removeObjectForKey:@"3"];
NSLog(@"dictionary:%@",dictionary);
/*******************************************************************************************
NSValue（对任何对象进行包装）
*******************************************************************************************/
/*--------------------------------将NSRect放入NSArray中------------------------------------*/
//将NSRect放入NSArray中
NSMutableArray *array = [[NSMutableArray alloc] init];
NSValue *value;
CGRect rect = CGRectMake(0, 0, 320, 480);
value = [NSValue valueWithBytes:&rect objCType:@encode(CGRect)];
[array addObject:value];
NSLog(@"array:%@",array);
//从Array中提取
value = [array objectAtIndex:0];
[value getValue:&rect];
NSLog(@"value:%@",value);
/*******************************************************************************************
从目录搜索扩展名为jpg的文件
*******************************************************************************************/
//NSFileManager *fileManager = [NSFileManager defaultManager];
NSString *home;
home = @"../Users/";
NSDirectoryEnumerator *direnum;
direnum = [fileManager enumeratorAtPath: home];
NSMutableArray *files = [[NSMutableArray alloc] init];
//枚举
NSString *filename;
while (filename = [direnum nextObject]) {
if([[filename pathExtension] hasSuffix:@"jpg"]){
[files addObject:filename];
}
}
//快速枚举
//for(NSString *filename in direnum)
//{
// if([[filename pathExtension] isEqualToString:@"jpg"]){
// [files addObject:filename];
// }
//}
NSLog(@"files:%@",files);
//枚举
NSEnumerator *filenum;
filenum = [files objectEnumerator];
while (filename = [filenum nextObject]) {
NSLog(@"filename:%@",filename);
}
//快速枚举
//for(id object in files)
//{
// NSLog(@"object:%@",object);
//}
//1、创建常量字符串。
NSString *astring = @"This is a String!";
//2、创建空字符串，给予赋值。
NSString *astring = [[NSString alloc] init];
astring = @"This is a String!";
[astring release];
NSLog(@"astring:%@",astring);
//
NSString *astring = [[NSString alloc] init];
NSLog(@"0x%.8x", astring);
astring=@"This is a String!";
NSLog(@"0x%.8x", astring);
[astring release];
NSLog(@"astring:%@",astring);
//3、在以上方法中，提升速度:initWithString方法
NSString *astring = [[NSString alloc] initWithString:@"This is a String!"];
NSLog(@"astring:%@",astring);
[astring release];
//4、用标准c创建字符串:initWithCString方法
char *Cstring = "This is a String!";
NSString *astring = [[NSString alloc] initWithCString:Cstring];
NSLog(@"astring:%@",astring);
[astring release];
//5、创建格式化字符串:占位符（由一个%加一个字符组成）
int i = 1;
int j = 2;
NSString *astring = [[NSString alloc] initWithString:[NSString stringWithFormat:@"%d.This is %i string!",i,j]];
NSLog(@"astring:%@",astring);
[astring release];
//6、创建临时字符串
NSString *astring;
astring = [NSString stringWithCString:"This is a temporary string"];
NSLog(@"astring:%@",astring);
//7、从文件创建字符串
NSString *path = [[NSBundlemainBundle] pathForResource:@"astring.text"ofType:nil];
NSString *astring = [[NSString alloc] initWithContentsOfFile:path];
NSLog(@"astring:%@",astring);
[astring release];
//8、用字符串创建字符串，并写入到文件
NSString *astring = [[NSString alloc] initWithString:@"This is a String!"];
NSLog(@"astring:%@",astring);
NSString *path = @"astring.text";
[astring writeToFile: path atomically: YES];
[astring release];
//9、用C比较:strcmp函数
char string1[] = "string!";
char string2[] = "string!";
if(strcmp(string1, string2) == 0)
{
NSLog(@"1");
}
//10、isEqualToString方法
NSString *astring01 = @"This is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 isEqualToString:astring02];
NSLog(@"result:%d",result);
//11、compare方法(comparer返回的三种值)
//
NSString *astring01 = @"This is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 compare:astring02] == NSOrderedSame; //NSOrderedSame判断两者内容是否相同
NSLog(@"result:%d",result);
//
NSString *astring01 = @"This is a String!";
NSString *astring02 = @"this is a String!";
BOOL result = [astring01 compare:astring02] == NSOrderedAscending; //NSOrderedAscending判断两对象值的大小(按字母顺序进行比较，astring02大于astring01为真)
NSLog(@"result:%d",result);
//
NSString *astring01 = @"this is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 compare:astring02] == NSOrderedDescending; //NSOrderedDescending判断两对象值的大小(按字母顺序进行比较，astring02小于astring01为真)
NSLog(@"result:%d",result);
//12、不考虑大小写比较字符串
//1.
NSString *astring01 = @"this is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 caseInsensitiveCompare:astring02] == NSOrderedSame; //NSOrderedDescending判断两对象值的大小(按字母顺序进行比较，astring02小于astring01为真)
NSLog(@"result:%d",result);
//2.
NSString *astring01 = @"this is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 compare:astring02
options:NSCaseInsensitiveSearch | NSNumericSearch] == NSOrderedSame; //NSCaseInsensitiveSearch:不区分大小写比较 NSLiteralSearch:进行完全比较，区分大小写 NSNumericSearch:比较字符串的字符个数，而不是字符值。
NSLog(@"result:%d",result);
//13、输出大写或者小写字符串
NSString *string1 = @"A String";
NSString *string2 = @"String";
NSLog(@"string1:%@",[string1 uppercaseString]);//大写
NSLog(@"string2:%@",[string2 lowercaseString]);//小写
NSLog(@"string2:%@",[string2 capitalizedString]);//首字母大小
//14、-rangeOfString: //查找字符串某处是否包含其它字符串
NSString *string1 = @"This is a string";
NSString *string2 = @"string";
NSRange range = [string1 rangeOfString:string2];
int location = range.location;
int leight = range.length;
NSString *astring = [[NSString alloc] initWithString:[NSString stringWithFormat:@"Location:%i,Leight:%i",location,leight]];
NSLog(@"astring:%@",astring);
[astring release];
//15、-substringToIndex: 从字符串的开头一直截取到指定的位置，但不包括该位置的字符
NSString *string1 = @"This is a string";
NSString *string2 = [string1 substringToIndex:3];
NSLog(@"string2:%@",string2);
//16、-substringFromIndex: 以指定位置开始（包括指定位置的字符），并包括之后的全部字符
NSString *string1 = @"This is a string";
NSString *string2 = [string1 substringFromIndex:3];
NSLog(@"string2:%@",string2);
//17、-substringWithRange: //按照所给出的位置，长度，任意地从字符串中截取子串
NSString *string1 = @"This is a string";
NSString *string2 = [string1 substringWithRange:NSMakeRange(0, 4)];
NSLog(@"string2:%@",string2);
//18、-stringWithCapacity: //按照固定长度生成空字符串
NSMutableString *String;
String = [NSMutableString stringWithCapacity:40];
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
[String1 appendString:@", I will be adding some character"];
[String1 appendFormat:[NSString stringWithFormat:@", I will be adding some character"]];
NSLog(@"String1:%@",String1);
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
[String1 insertString:@"Hi! " atIndex:0];
NSLog(@"String1:%@",String1);
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
[String1 setString:@"Hello Word!"];
NSLog(@"String1:%@",String1);
NSMutableString *String1 = [[NSMutableString alloc] initWithString:@"This is a NSMutableString"];
[String1 replaceCharactersInRange:NSMakeRange(0, 4) withString:@"That"];
NSLog(@"String1:%@",String1);
NSString *String1 = @"NSStringInformation.txt";
[String1 hasPrefix:@"NSString"] = = 1 ? NSLog(@"YES") : NSLog(@"NO");
[String1 hasSuffix:@".txt"] = = 1 ? NSLog(@"YES") : NSLog(@"NO");
//24、扩展路径
NSString *Path = @"~/NSData.txt";
NSString *absolutePath = [Path stringByExpandingTildeInPath];
NSLog(@"absolutePath:%@",absolutePath);
NSLog(@"Path:%@",[absolutePath stringByAbbreviatingWithTildeInPath]);
//25、文件扩展名
NSString *Path = @"~/NSData.txt";
NSLog(@"Extension:%@",[Path pathExtension]);
要把 “2011-11-29” 改写成 “2011/11/29”一开始想用ios的时间格式，后来用NSString的方法搞定。
[string stringByReplacingOccurrencesOfString:@"-"withString:@"/"]; 一句话搞定。 发现NSString还是很值得研究下，于是做做笔记。
看了天梯梦的博客觉得相当不错，于是懒得写了直接粘贴转载。原文地址 http://justcoding.iteye.com/blog/1405951
1.创建NSString字符串
NSString 与 char* 最大的区别就是 NSString是一个objective对象,而char* 是一个字节数组。@+" 字符串 " 这个符号为objective-c NSString 字符串常量的标准用法，char* 创建的时候 无需添加@
- - (void)viewDidLoad
- [super viewDidLoad];
- //经典的字符串赋值
- NSString *str0 = @"my name is justcoding !";
- //字符串格式化合并分别包括
- //NSString*类型 int类型 char*类型
- NSString *str1 = [NSString stringWithFormat:@"我的名字：%@ 我的年龄：%d 我的邮箱：%s",@"justcoding", 25,"justcoding@gmail.com"];
- //字符串赋值 参数中只可以写一个字符串 和第一种很像
- NSString *str2 = [NSString stringWithString:@"我是字符串"];
- //字符串转换为utf-8格式 参数为char*类型
- NSString *str3 = [NSString stringWithUTF8String:"字符串转换utf-8格式"];
- //字符串合并
- int i = 100;
- char*c = "xuanyusong";
- NSString *temp = @"我是临时字符串";
- //在字符串temp的基础继续添加 int i 与 char* c 组成一个新的字符串
- NSString *str4 = [temp stringByAppendingFormat:@"整型： %d 字符型 ：%s",i,c];
- //在字符串temp的基础继续添加temp 并组成一个新的字符串
- NSString *str5 = [temp stringByAppendingString:temp];
- //字符串输出
- NSLog(@"str0 = %@", str0);
- NSLog(@"str1 = %@", str1);
- NSLog(@"str2 = %@", str2);
- NSLog(@"str3 = %@", str3);
- NSLog(@"str4 = %@", str4);
- NSLog(@"str5 = %@", str5);
- (void)viewDidLoad
{
[super viewDidLoad];
//经典的字符串赋值
NSString *str0 = @"my name is justcoding !";
//字符串格式化合并分别包括
//NSString*类型 int类型 char*类型
NSString *str1 = [NSString stringWithFormat:@"我的名字：%@ 我的年龄：%d 我的邮箱：%s",@"justcoding", 25,"justcoding@gmail.com"];
//字符串赋值 参数中只可以写一个字符串 和第一种很像
NSString *str2 = [NSString stringWithString:@"我是字符串"];
//字符串转换为utf-8格式 参数为char*类型
NSString *str3 = [NSString stringWithUTF8String:"字符串转换utf-8格式"];
//字符串合并
int i = 100;
char*c = "xuanyusong";
NSString *temp = @"我是临时字符串";
//在字符串temp的基础继续添加 int i 与 char* c 组成一个新的字符串
NSString *str4 = [temp stringByAppendingFormat:@"整型： %d 字符型 ：%s",i,c];
//在字符串temp的基础继续添加temp 并组成一个新的字符串
NSString *str5 = [temp stringByAppendingString:temp];
//字符串输出
NSLog(@"str0 = %@", str0);
NSLog(@"str1 = %@", str1);
NSLog(@"str2 = %@", str2);
NSLog(@"str3 = %@", str3);
NSLog(@"str4 = %@", str4);
NSLog(@"str5 = %@", str5);
}
2.字符串的遍历
每一个字符串其实是由若干个char字符组成，字符串的遍历实际上就是将字符串中的每一个字符提取出来。
- - (void)viewDidLoad
- [super viewDidLoad];
- //经典的字符串赋值
- NSString *str = @"YUSONGMOMO";
- //字符串的长度
- int count = [str length];
- NSLog(@"字符串的长度是%d",count);
- //遍历字符串中的每一个字符
- for(int i =0; i < count; i++)
- char c = [str characterAtIndex:i];
- NSLog(@"字符串第 %d 位为 %c",i,c);
- (void)viewDidLoad
{
[super viewDidLoad];
//经典的字符串赋值
NSString *str = @"YUSONGMOMO";
//字符串的长度
int count = [str length];
NSLog(@"字符串的长度是%d",count);
//遍历字符串中的每一个字符
for(int i =0; i < count; i++)
{
char c = [str characterAtIndex:i];
NSLog(@"字符串第 %d 位为 %c",i,c);
}
}
3.字符串的比较
isEqualToString 比较字符串是否完全相等，大小写不一样也无法完全匹配。
hasPrefixe 匹配字符串头
haSuffix 匹配字符串的尾巴
- - (void)viewDidLoad
- [super viewDidLoad];
- NSString *str0 = @"justcoding";
- NSString *str1 = @"justcoding";
- //字符串完全相等比较
- if([str0 isEqualToString:str1])
- NSLog(@"字符串完全相等");
- //字符串以开头比较
- if([str0 hasPrefix:@"just"])
- NSLog(@"字符串str0以just开头");
- //字符串以结尾比较
- if([str1 hasSuffix:@"coding"])
- NSLog(@"str1字符串以coding结尾");
- (void)viewDidLoad
{
[super viewDidLoad];
NSString *str0 = @"justcoding";
NSString *str1 = @"justcoding";
//字符串完全相等比较
if([str0 isEqualToString:str1])
{
NSLog(@"字符串完全相等");
}
//字符串以开头比较
if([str0 hasPrefix:@"just"])
{
NSLog(@"字符串str0以just开头");
}
//字符串以结尾比较
if([str1 hasSuffix:@"coding"])
{
NSLog(@"str1字符串以coding结尾");
}
}
- //isEqualToString方法
- NSString *astring01 = @"This is a String!";
- NSString *astring02 = @"This is a String!";
- BOOL result = [astring01 isEqualToString:astring02];
- NSLog(@"result:%d",result);
//isEqualToString方法
NSString *astring01 = @"This is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 isEqualToString:astring02];
NSLog(@"result:%d",result);
- //compare方法(comparer返回的三种值)
- NSString *astring01 = @"This is a String!";
- NSString *astring02 = @"This is a String!";
- BOOL result = [astring01 compare:astring02] = = NSOrderedSame;
- NSLog(@"result:%d",result);
- //NSOrderedSame 判断两者内容是否相同
//compare方法(comparer返回的三种值)
NSString *astring01 = @"This is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 compare:astring02] = = NSOrderedSame;
NSLog(@"result:%d",result);
//NSOrderedSame 判断两者内容是否相同
- NSString *astring01 = @"This is a String!";
- NSString *astring02 = @"this is a String!";
- BOOL result = [astring01 compare:astring02] = = NSOrderedAscending;
- NSLog(@"result:%d",result);
- //NSOrderedAscending 判断两对象值的大小(按字母顺序进行比较，astring02大于astring01为真)
NSString *astring01 = @"This is a String!";
NSString *astring02 = @"this is a String!";
BOOL result = [astring01 compare:astring02] = = NSOrderedAscending;
NSLog(@"result:%d",result);
//NSOrderedAscending 判断两对象值的大小(按字母顺序进行比较，astring02大于astring01为真)
- NSString *astring01 = @"this is a String!";
- NSString *astring02 = @"This is a String!";
- BOOL result = [astring01 compare:astring02] = = NSOrderedDescending;
- NSLog(@"result:%d",result);
- //NSOrderedDescending 判断两对象值的大小(按字母顺序进行比较，astring02小于astring01为真)
NSString *astring01 = @"this is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 compare:astring02] = = NSOrderedDescending;
NSLog(@"result:%d",result);
//NSOrderedDescending 判断两对象值的大小(按字母顺序进行比较，astring02小于astring01为真)
- //不考虑大 小写比较字符串1
- NSString *astring01 = @"this is a String!";
- NSString *astring02 = @"This is a String!";
- BOOL result = [astring01 caseInsensitiveCompare:astring02] = = NSOrderedSame;
- NSLog(@"result:%d",result);
- //NSOrderedDescending判断两对象值的大小(按字母顺序进行比较，astring02小于astring01为 真)
//不考虑大 小写比较字符串1
NSString *astring01 = @"this is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 caseInsensitiveCompare:astring02] = = NSOrderedSame;
NSLog(@"result:%d",result);
//NSOrderedDescending判断两对象值的大小(按字母顺序进行比较，astring02小于astring01为 真)
- //不考虑大小写比较字符串2
- NSString *astring01 = @"this is a String!";
- NSString *astring02 = @"This is a String!";
- BOOL result = [astring01 compare:astring02 options:NSCaseInsensitiveSearch | NSNumericSearch] = = NSOrderedSame;
- NSLog(@"result:%d",result);
- //NSCaseInsensitiveSearch:不区分大小写比较 NSLiteralSearch:进行完全比较，区分大小写 NSNumericSearch:比较字符串的字符个数，而不是字符值。
//不考虑大小写比较字符串2
NSString *astring01 = @"this is a String!";
NSString *astring02 = @"This is a String!";
BOOL result = [astring01 compare:astring02 options:NSCaseInsensitiveSearch | NSNumericSearch] = = NSOrderedSame;
NSLog(@"result:%d",result);
//NSCaseInsensitiveSearch:不区分大小写比较 NSLiteralSearch:进行完全比较，区分大小写 NSNumericSearch:比较字符串的字符个数，而不是字符值。
判断的方法可以利用 NSString 类别中 caseInsensitiveCompare: 所回传 -1、0 或是 1 的数值，判定两个字串之间得排序关系，其程式玛如下。
- NSString *string = @"0";
- NSComparisonResult result = [string caseInsensitiveCompare:@"A"];
- switch (result) {
- case NSOrderedAscending:
- NSLog(@"升幂");
- break;
- case NSOrderedSame:
- NSLog(@"忽略大小写相同的字串");
- break;
- case NSOrderedDescending:
- NSLog(@"降幂");
- break;
- default:
- NSLog(@"无法判定");
- break;
NSString *string = @"0";
NSComparisonResult result = [string caseInsensitiveCompare:@"A"];
switch (result) {
case NSOrderedAscending:
NSLog(@"升幂");
break;
case NSOrderedSame:
NSLog(@"忽略大小写相同的字串");
break;
case NSOrderedDescending:
NSLog(@"降幂");
break;
default:
NSLog(@"无法判定");
break;
}
4. 文件字符串操作（读写）
- //从文件读取字符串:initWithContentsOfFile方法
- NSString *path = @"astring.text";
- NSString *astring = [[NSString alloc] initWithContentsOfFile:path];
- NSLog(@"astring:%@",astring);
- [astring release]; //astring=nil;
//从文件读取字符串:initWithContentsOfFile方法
NSString *path = @"astring.text";
NSString *astring = [[NSString alloc] initWithContentsOfFile:path];
NSLog(@"astring:%@",astring);
[astring release]; //astring=nil;
- //写字符串到文件:writeToFile方法
- NSString *astring = [[NSString alloc] initWithString:@"This is a String!"];
- NSLog(@"astring:%@",astring);
- NSString *path = @"astring.text";
- [astring writeToFile: path atomically: YES];
- [astring release]; //astring=nil;
//写字符串到文件:writeToFile方法
NSString *astring = [[NSString alloc] initWithString:@"This is a String!"];
NSLog(@"astring:%@",astring);
NSString *path = @"astring.text";
[astring writeToFile: path atomically: YES];
[astring release]; //astring=nil;
* ios5 不支持release iOS应用开发：什么是ARC？
- //扩展路径
- NSString *Path = @"~/NSData.txt";
- NSString *absolutePath = [Path stringByExpandingTildeInPath];
- NSLog(@"absolutePath:%@",absolutePath);
- NSLog(@"Path:%@",[absolutePath stringByAbbreviatingWithTildeInPath]);
//扩展路径
NSString *Path = @"~/NSData.txt";
NSString *absolutePath = [Path stringByExpandingTildeInPath];
NSLog(@"absolutePath:%@",absolutePath);
NSLog(@"Path:%@",[absolutePath stringByAbbreviatingWithTildeInPath]);
- //文件扩展名
- NSString *Path = @"~/NSData.txt";
- NSLog(@"Extension:%@",[Path pathExtension]);
//文件扩展名
NSString *Path = @"~/NSData.txt";
NSLog(@"Extension:%@",[Path pathExtension]);
5. 字符串的截取和大小写
- //改变字符串的大小写
- NSString *string1 = @"A String";
- NSString *string2 = @"String";
- NSLog(@"string1:%@",[string1 uppercaseString]);//大写
- NSLog(@"string2:%@",[string2 lowercaseString]);//小写
- NSLog(@"string2:%@",[string2 capitalizedString]);//首字母大小
//改变字符串的大小写
NSString *string1 = @"A String";
NSString *string2 = @"String";
NSLog(@"string1:%@",[string1 uppercaseString]);//大写
NSLog(@"string2:%@",[string2 lowercaseString]);//小写
NSLog(@"string2:%@",[string2 capitalizedString]);//首字母大小
Java代码
- - (void)viewDidLoad
- [super viewDidLoad];
- NSString *str0 = @"中文my name is xuanyusong";
- //截取字符串起始点到index为4之间的内容
- NSString * to = [str0 substringToIndex:4];
- NSLog(@"to = %@",to);
- //截取字符index为2 到结尾之间的内容
- NSString * from = [str0 substringFromIndex:2];
- NSLog(@"from = %@",from);
- //设置截取字符串的范围
- //从第二位开始,长度为十
- NSRange rang = NSMakeRange(2, 10);
- NSString * strRang = [str0 substringWithRange:rang];
- NSLog(@"rang = %@",strRang);
- //设置字符串首字母大写
- NSLog(@"str0首字母大写:%@",[str0 capitalizedString]);
- //设置字符串全部内容为大写
- NSLog(@"str0大写:%@",[str0 uppercaseString]);
- //设置字符全部内容为小写
- NSLog(@"str0小写:%@",[str0 lowercaseString]);
- (void)viewDidLoad
{
[super viewDidLoad];
NSString *str0 = @"中文my name is xuanyusong";
//截取字符串起始点到index为4之间的内容
NSString * to = [str0 substringToIndex:4];
NSLog(@"to = %@",to);
//截取字符index为2 到结尾之间的内容
NSString * from = [str0 substringFromIndex:2];
NSLog(@"from = %@",from);
//设置截取字符串的范围
//从第二位开始,长度为十
NSRange rang = NSMakeRange(2, 10);
NSString * strRang = [str0 substringWithRange:rang];
NSLog(@"rang = %@",strRang);
//设置字符串首字母大写
NSLog(@"str0首字母大写:%@",[str0 capitalizedString]);
//设置字符串全部内容为大写
NSLog(@"str0大写:%@",[str0 uppercaseString]);
//设置字符全部内容为小写
NSLog(@"str0小写:%@",[str0 lowercaseString]);
}
6.搜索字符串与替换字符串
- - (void)viewDidLoad
- [super viewDidLoad];
- NSString *str0 = @"中文my name is xuanyusong";
- NSString *temp = @"is";
- NSRange rang = [str0 rangeOfString:temp];
- NSLog(@"搜索的字符串在str0中起始点的index 为 %d", rang.location);
- NSLog(@"搜索的字符串在str0中结束点的index 为 %d", rang.location + rang.length);
- //将搜索中的字符串替换成为一个新的字符串
- NSString *str = [str0 stringByReplacingCharactersInRange:rang withString:@"哇咔咔卡卡咔"];
- NSLog(@"替换后字符串为%@", str);
- //将字符串中" " 全部替换成 *
- str = [str0 stringByReplacingOccurrencesOfString :@" " withString:@"@"];
- NSLog(@"替换后字符串为%@", str);
- (void)viewDidLoad
{
[super viewDidLoad];
NSString *str0 = @"中文my name is xuanyusong";
NSString *temp = @"is";
NSRange rang = [str0 rangeOfString:temp];
NSLog(@"搜索的字符串在str0中起始点的index 为 %d", rang.location);
NSLog(@"搜索的字符串在str0中结束点的index 为 %d", rang.location + rang.length);
//将搜索中的字符串替换成为一个新的字符串
NSString *str = [str0 stringByReplacingCharactersInRange:rang withString:@"哇咔咔卡卡咔"];
NSLog(@"替换后字符串为%@", str);
//将字符串中" " 全部替换成 *
str = [str0 stringByReplacingOccurrencesOfString :@" " withString:@"@"];
NSLog(@"替换后字符串为%@", str);
}
拓展：使用下面这个方法整体替换字符串还可以设置替换的区域。
stringByReplacingOccurrencesOfString:(NSString *)withString:(NSString *) options:(NSStringCompareOptions) range:(NSRange)
7.字符串尾部添加
使用alloc在内存中创建字符串对象后边可以动态的操作这个字符串，修改与添加等。
appendstring 方法：向字符串尾部添加一个字符串。
appendFormat方法：向字符串尾部添加多个类型的字符串，可以添加任意数量与类型的字符串。
- - (void)viewDidLoad
- [super viewDidLoad];
- NSMutableString * str = [[NSMutableString alloc] init];
- //添加普通的字符串
- [str appendString:@"aaa"];
- //添加字符串 整型 字符型
- [str appendFormat:@"我的名字：%@ 我的年龄：%d 我的邮箱：%s",@"justcoding", 25,"justcoding@gmail.com"];
- NSLog(@"str = %@",str);
- (void)viewDidLoad
{
[super viewDidLoad];
NSMutableString * str = [[NSMutableString alloc] init];
//添加普通的字符串
[str appendString:@"aaa"];
//添加字符串 整型 字符型
[str appendFormat:@"我的名字：%@ 我的年龄：%d 我的邮箱：%s",@"justcoding", 25,"justcoding@gmail.com"];
NSLog(@"str = %@",str);
}
8. 字符串中删除元素
stringWithString 方法：用于创建字符串初始化赋值
rangeOfString方法：传入字符串返回一个在该字符串中的范围 也可以写 NSMakeRange(0, 3) 意思是范围在字符串0位到第3位
deleteCharactersInRange:删除字符串 参数为Range 就是删除的范围。
- - (void)viewDidLoad
- [super viewDidLoad];
- //创建字符串
- NSMutableString *str = [NSMutableString stringWithString:@"justcoding is best!"];
- //删除字符串中含"justcoding"的字符
- [str deleteCharactersInRange: [str rangeOfString: @"justcoding"]];
- NSLog(@"str = %@",str);
- (void)viewDidLoad
{
[super viewDidLoad];
//创建字符串
NSMutableString *str = [NSMutableString stringWithString:@"justcoding is best!"];
//删除字符串中含"justcoding"的字符
[str deleteCharactersInRange: [str rangeOfString: @"justcoding"]];
NSLog(@"str = %@",str);
}
9. 字符串插入
stringWithString 方法：用于创建字符串初始化赋值
insertString方法：第一个参数 插入的字符串对象， 第二个参数 插入的位置。
- - (void)viewDidLoad
- [super viewDidLoad];
- //创建字符串
- NSMutableString *str = [NSMutableString stringWithString:@"justcoding is"];
- //在str第10位插入字符串
- [str insertString:@"best man" atIndex:10];
- NSLog(@"str = %@",str);
- (void)viewDidLoad
{
[super viewDidLoad];
//创建字符串
NSMutableString *str = [NSMutableString stringWithString:@"justcoding is"];
//在str第10位插入字符串
[str insertString:@"best man" atIndex:10];
NSLog(@"str = %@",str);
}
10. 字符串拷贝
- - (void)viewDidLoad
- [super viewDidLoad];
- //创建字符串
- NSMutableString *str1 = [NSMutableString stringWithString: @"字符串1"];
- NSMutableString *str2;
- //字符串赋值
- str2 = str1;
- [str2 appendString: @" 和字符串2"];
- NSLog (@"str1 = %@", str1);
- NSLog (@"str2 = %@", str2);
- (void)viewDidLoad
{
[super viewDidLoad];
//创建字符串
NSMutableString *str1 = [NSMutableString stringWithString: @"字符串1"];
NSMutableString *str2;
//字符串赋值
str2 = str1;
[str2 appendString: @" 和字符串2"];
NSLog (@"str1 = %@", str1);
NSLog (@"str2 = %@", str2);
}
为什么给str2添加数据后 str1的数据也改变了？这就是指针的魅力所在，因为我们操作的是指针，str2 = str1 意思是两个指针同时指向一块内存，那么str2指向的内存内容改变以后str1当然跟着改变了。
11. 字符串与指定类型转换
如果转换的参数非法的话不会抛出异常，好比用中文去转整型。不会报错 但是转换结果为 0 ，默认值。
- - (void)viewDidLoad
- [super viewDidLoad];
- //字符串转整型
- NSString *str0 = @"1121";
- //NSString *str0 = @"中国";
- //把字符串强转成整型
- int i = [str0 intValue];
- NSLog (@"转换后：%i", i);
- //字符串转interger
- NSString *str1 = @"1985";
- // NSString *str1 = @"中国";
- //把字符串强转成interger
- NSInteger ii = [str1 integerValue];
- NSLog (@"转换后：%i", ii);
- //字符串转double
- NSString *str2 = @"3.145926";
- //NSString *str2 = @"中国";
- //把字符串强转成double
- double d = [str2 doubleValue];
- NSLog (@"转换后：%f", d);
- //字符串转float
- NSString *str3 = @"3.145926";
- //NSString *str3 = @"中国";
- //把字符串强转成float
- double f = [str3 floatValue];
- NSLog (@"转换后：%f", f);
- (void)viewDidLoad
{
[super viewDidLoad];
//字符串转整型
NSString *str0 = @"1121";
//NSString *str0 = @"中国";
//把字符串强转成整型
int i = [str0 intValue];
NSLog (@"转换后：%i", i);
//字符串转interger
NSString *str1 = @"1985";
// NSString *str1 = @"中国";
//把字符串强转成interger
NSInteger ii = [str1 integerValue];
NSLog (@"转换后：%i", ii);
//字符串转double
NSString *str2 = @"3.145926";
//NSString *str2 = @"中国";
//把字符串强转成double
double d = [str2 doubleValue];
NSLog (@"转换后：%f", d);
//字符串转float
NSString *str3 = @"3.145926";
//NSString *str3 = @"中国";
//把字符串强转成float
double f = [str3 floatValue];
NSLog (@"转换后：%f", f);
}
http://blog.csdn.net/xys289187120/article/details/6777283
http://www.cocoachina.com/iphonedev/sdk/2010/0607/1634.html
NSString 常用方法总结
| +(id)stringWithContentsOfFile:path encoding:enc err | 创建一个新字符串并将其设置为 path 指定文件的内容，使用字符编码 enc，在err 上返回错误 |
| +(id)stringWithContentsOfURL:url encoding:enc err | 创建一个新字符串并将其设置为 url 所指向的内容，使用字符编码 enc，在err 上返回错误 |
| +(id)string | 创建一个新的空字符串 |
| +(id)stringWithString:nsstring | 创建一个新字符串，将其内容设置为 nsstring 内容 |
| -(id)initWithString:nsstring | 将字符串内容设置为 nsstring 内容 |
| -(id)initWithContentsOfFile:path encoding:enc error:err | 将字符串设置为 path 指定文件的内容，使用字符编码 enc，在err 上返回错误 |
| -(id)initWithContentsOfURL:url encoding:enc error:err | 将字符串设置为 url 所指向的内容，使用字符编码 enc，在err 上返回错误 |
| -(UNSigned int)length | 返回字符串中字符数目 |
| -(unichar)characterAtindex:i | 返回索引i 所在UniCode 字符 |
| -(NSString*)substringFromIndex:i | 返回从索引 i 开始到结尾的子字符串 |
| -(NSString*)substringWithRange:range | 根据指定范围返回子字符串 |
| -(NSString*)substringToIndex:i | 返回从字符串开始到 索引 i 的子字符串 |
| -(NSComparator*)caseInsensitiveCompare:nsstring | 比较两个字符串大小，忽略大小写 |
| -(NSComparator*)compare:nsstring | 比较两个字符串大小 |
| -(BOOL)hasPrefix:nsstring | 测试字符串是否以 nsstring 开始 |
| -(BOOL)hasSuffix:nsstring | 测试字符串是否以 nsstring 结尾 |
| -(BOOL)isEqualToString:nsstring | 测试两个字符串是否相等 |
| -(NSString*)capitalizedString | 返回字符串，串中的每个单词的首字母大写，其余字母小写 |
| -(NSString*)lowercaseString | 返回转换为小写的字符串 |
| -(NSString*)uppercaseString | 返回转换为大写的字符串 |
| -(const char*)UTF8String | 返回UTF8编码格式的字符串 |
| -(double)doubleValue | 返回转换为double 类型的字符串 |
| -(float)floatValue | 返回转换为 float 类型的字符串 |
| -(NSInteger)integerValue | 返回转换为 NSInteger 类型的新字符串 |
| -(int)intvalue | 返回转换为 int 的字符串 |
NSMutableString 可修改字符串常用方法
| +(id)stringWithCapacity:size | 创建一个字符串，容量为size大小 |
| -(id)initWithCapacity:size | 初始化一个字符串，容量为size |
| -(void)setString:nsstring | 将字符串设置为 nsstring |
| -(void)appendString:nsstring | 在字符串末尾追加字符串 nsstring |
| -(void)deleteCharatersInRange:range | 删除指定range 中的字符 |
| -(void)insertString:nsstring atIndex:i | 以索引 i 为起始位置插入 nsstring |
| -(void)replaceCharatersInRange;range withString:nsstring | 使用 nsstring 替换 range 指定的字符 |
| -(void)replaceOccurrencesOfString:nsstring withString:nsstring2 options:opts range:range | 根据选项 opts ，使用指定 range 中的nsstring2 替换所有的 nsstring |