OC Foundation框架—字符串操作方法及习题

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[]) {
    @autoreleasepool {       
        /*
         不可变字符串
         1.创建字符串
            实例方法（3种）
            类方法（3种）
         2.不可变字符串：
           统计长度（2种）
           索引提取 (3种)
           比较 (3种)
           查照字符串位置（1种）
           判断前后缀
           转换数字
           大小写转换
           字符串提取
         
         可变字符串
         1.创建可变字符串
         2.可变字符串的操作
         增（3种）删（1种）改（1种）查
         
         
         */
        
        //实例方法（3种）
        NSString *str1 = @"123456789";
        NSString *str2 = [[NSString alloc] initWithFormat:@"%d4567",3];
//        NSString *str3 = [[NSString alloc] initWithString:str2];//传的是对象
        
        //类方法（3种）
        NSString *str4 = [NSString stringWithFormat:@"Abc%@eFg",@"d"];
//        NSString *str5 = [NSString stringWithString:str4];
        

        
        //统计长度（2种）
        NSUInteger length = [str1 length];
        NSUInteger length1 = str1.length;
        NSLog(@"%lu %lu",length,length1);

        
        //索引提取 (3种)
        NSString *newStr1 = [str1 substringFromIndex:3];
        NSLog(@"%@",newStr1);
        NSString *newStr2 = [str1 substringToIndex:3];
        NSLog(@"%@",newStr2);
        NSString *newStr3 = [str1 substringWithRange:NSMakeRange(3, 4)];
        NSLog(@"%@",newStr3);
        
        
        //比较 (3种)
        if ([str1 isEqualToString:str2]) {
            NSLog(@"相同");
        }else
            NSLog(@"不相同");
        
        
        
        if ([str1 compare:str2] == NSOrderedAscending) {
            NSLog(@"str1>str2");
        }
        else if ([str1 compare:str2] == NSOrderedDescending)
            NSLog(@"str1<str2");
        else if ([str1 compare:str2] == NSOrderedSame)
            NSLog(@"==");
        
        
        
        if ([str1 caseInsensitiveCompare:str2] == NSOrderedAscending) {
            NSLog(@"str1>str2");
        }
        else if ([str1 caseInsensitiveCompare:str2] == NSOrderedDescending)
            NSLog(@"str1<str2");
        else if ([str1 caseInsensitiveCompare:str2] ==NSOrderedSame)
            NSLog(@"==");
        
        
        // 查找字符串位置
        NSRange range = [str1 rangeOfString:str2];
        if (range.location != NSNotFound) {
            NSLog(@"location:%lu  length:%lu",range.location,range.length);

        } else {
            NSLog(@"没找到");
        }
        
        
        //判断前后缀（2种）
        BOOL flag = [str4 hasPrefix:@"abc"];
        NSLog(@"%d",flag);
        
        BOOL anotherFlag = [str4 hasSuffix:@"fg"];
        NSLog(@"%d",anotherFlag);
        
        
        //转换数字（4种）
        int number = [str1 intValue];
        NSLog(@"%d",number);
        
        NSInteger number1 = [str1 intValue];
        NSLog(@"%ld",number1);
        
        NSString *str6 = @"1234567.89";
        double number2 = [str6 doubleValue];
        NSLog(@"%lf",number2);
        
        //大小写转换
        NSString *upStr = [str4 uppercaseString];
        NSLog(@"%@",upStr);
        NSString *lowStr = [str4 lowercaseString];
        NSLog(@"%@",lowStr);
        NSString *tempStr = [str4 capitalizedString];
        NSLog(@"%@",tempStr);
        
        
        
        
        // 可变字符串
        // 实例方法
        NSMutableString *muStr1 = [[NSMutableString alloc]
                                   initWithFormat:@"1%d3",2];
        
        NSMutableString *muStr2 = [[NSMutableString alloc]
                                   initWithString:@"123"];
        
        NSMutableString *muStr3 = [[NSMutableString alloc]
                                   initWithCapacity:10];
        
        // 类方法
        NSMutableString *muStr4 = [NSMutableString stringWithFormat:@"4%d6",5];
        
        NSMutableString *muStr5 = [NSMutableString stringWithString:@"123"];
        
        NSMutableString *muStr6 = [NSMutableString stringWithCapacity:10];
        
        
        //增（3种）
        
        [muStr1 appendFormat:@"%d",456];
        NSLog(@"%@",muStr1);
        
        [muStr2 appendString:@"789"];
        NSLog(@"%@",muStr2);
        
        [muStr3 insertString:@"abcdefghijklmn" atIndex:0];
        NSLog(@"%@",muStr3);
        
        [muStr4 insertString:@"abcdefghijklmn" atIndex:2];
        NSLog(@"%@",muStr4);
        
        
        
        //删除
        [muStr5 deleteCharactersInRange:NSMakeRange(2, 1)];
        NSLog(@"%@",muStr5);
        
        //改
        [muStr6 replaceCharactersInRange:NSMakeRange(0, 0) withString:@"1234567890"];
        NSLog(@"%@",muStr6);
        
        [muStr5 replaceCharactersInRange:NSMakeRange(0, 1) withString:@"abcd"];
        NSLog(@"%@",muStr5);

#import <Foundation/Foundation.h>

@interface MyStringTools : NSObject

/*
 
 1.创建一个类，要求：
 (1)、定义一个方法，能完成字符串逆序输出的操作
 (2)、定义一个方法，能删除某字符串中的指定字串
 
    myStringTool  delete:(NSString*) InString:(NSString*)
 
 (3)、定义一个方法，能查找某字符串在某字符串中出现的次数
 (4)、定义一个方法，能传入两个字符串,将这个字符串组合成一个新的对称字符串返回
 (5)、定义一个方法，能将原字符串进行小写转大写，大写转小写
 (6)、定义一个方法，能压缩传入的字符串
 （比如输入@"aaabbbcceaa" 输出@"3a3b2c1e2a"）
 (7)、定义一个方法，能对传入的字符串按照字母顺序进行排列
 （比如输入@"aczabczab"  输出@"aaabbcczz”）
 (8)、定义一个方法，能够替换某字符串中的某个指定字串
 (9)、定义一个方法，能够获取指定字符串长度。
 */

//定义一个方法，能完成字符串逆序输出的操作
+(NSString *) reverseOrder:(NSString *) str1;

//定义一个方法，能删除某字符串中的指定字串
+(NSString *) deleteTheString:(NSString *) str1
                     inString:(NSString *) str2;

//定义一个方法，能查找某字符串在某字符串中出现的次数
+(NSInteger) findNumberOfString:(NSString *) str1
                       inString:(NSString *) str2;

//定义一个方法，能传入两个字符串,将这个字符串组合成一个新的对称字符串返回
+(NSString *) makeUpString:(NSString *) str1
                 andString:(NSString *) str2;

//定义一个方法，能将原字符串进行小写转大写，大写转小写
+(NSString *) convertLetters:(NSString *) str1 andCase:(NSString *) mycase;

//定义一个方法，能压缩传入的字符串
+(NSString *) compressString:(NSString *) str1;

//定义一个方法，能对传入的字符串按照字母顺序进行排列
+(NSString *) theStringOrder:(NSString *) str1;

//定义一个方法，能够替换某字符串中的某个指定字串
+(NSString *) replaceTheString:(NSString *) str1
                    fromString:(NSString *) str2
                      toString:(NSString *) str3;

//定义一个方法，能够获取指定字符串长度
+(NSInteger) obtainTheLength:(NSString *) str1;
@end







#import "MyStringTools.h"

@implementation MyStringTools

+(NSString *) reverseOrder:(NSString *) str1
{
    NSMutableString *string = [NSMutableString stringWithString:str1];
    NSMutableString *mutableString =[NSMutableString stringWithString:str1];

    
    for (int i=0; i<string.length; i++) {
        //方法1
        NSString *subStr1 = [string substringWithRange:NSMakeRange(i, 1)];
        NSString *subStr2 = [string substringWithRange:
                             NSMakeRange(string.length - i-1, 1)];
        // 取长度和范围
        NSRange range1 = [string rangeOfString:subStr1];
        NSRange range2 = [string rangeOfString:subStr2];
        
        [mutableString replaceCharactersInRange:range1 withString:subStr2];
        [mutableString replaceCharactersInRange:range2
                                     withString:subStr1];
    }
        return mutableString;

        //方法2
//        NSString *tempStr = [string substringFromIndex:string.length-1];
//        
//        [string insertString:tempStr atIndex:i];
//        
//        [string deleteCharactersInRange:NSMakeRange(string.length-1,1)];
//         }
//    return string
    
}

+(NSString *) deleteTheString:(NSString *) str1
                     inString:(NSString *) str2
{
    NSMutableString *string = [NSMutableString stringWithString:str2];
    
    NSRange range = [string rangeOfString:str1];
    
    if (range.location !=NSNotFound) {
        [string deleteCharactersInRange:range];
    }
    else
        NSLog(@"没有发现字符");
    return string;
}

+(NSInteger) findNumberOfString:(NSString *) str1
                       inString:(NSString *) str2
{
    int i,count=0;
    
    NSMutableString *string = [NSMutableString stringWithString:str2];
    
    for (i=0; i<string.length; i++) {
        
        NSRange range = [string rangeOfString:str1];
        
        if (range.location !=NSNotFound) {
        [string deleteCharactersInRange:range];
            count++;
        }
    }
    return count;
}


+(NSString *) makeUpString:(NSString *) str1
                 andString:(NSString *) str2
{
    NSMutableString *string = [NSMutableString stringWithString:str2];
    [string appendString:str1];
    
    for (NSInteger i=string.length-1; i>=0; i--) {
        [string appendString:[string substringWithRange:NSMakeRange(i, 1)]];
        
    }
    return string;
}

+(NSString *) convertLetters:(NSString *) str1 andCase:(NSString *) mycase
{
    NSMutableString *string = [NSMutableString stringWithString:str1];
    
    if ([mycase isEqualToString:@"大写"]) {
        return [string uppercaseString];
    }
    else
        return [string lowercaseString];
}

+(NSString *) compressString:(NSString *) str1
{
    int i;
    NSMutableString *string = [NSMutableString stringWithString:str1];
    NSMutableString *newString;
    NSMutableString *newString1 = [NSMutableString stringWithString:@""];
    
    for (i=0; i<string.length; i++) {
        
        NSString *tempStr = [string substringWithRange:NSMakeRange(0, 1)];
        int count=0;

        for (int j=0; j<string.length; j++) {
            
            NSString *tempStr1 = [string substringWithRange:NSMakeRange(0, 1)];
            
        if ([tempStr1 isEqualToString:tempStr]) {
            
            [string deleteCharactersInRange:NSMakeRange(0, 1)];
            count++;
        }
        }
        newString = [NSMutableString stringWithFormat:@"%d%@",count,tempStr];
        [newString1 appendString:newString];
        
    }
    return newString1;

}

+(NSString *) theStringOrder:(NSString *) str1
{
    NSMutableString *string = [NSMutableString stringWithString:str1];
    
    for (int i=0; i<string.length-1; i++) {
        for (int j=0; j<string.length-1; j++) {
            
            NSString *tempStr1=[string substringWithRange:NSMakeRange(j, 1)];
            NSString *tempStr2=[string substringWithRange:NSMakeRange(j+1, 1)];
            
            NSRange range1 = [string rangeOfString:tempStr1];
            NSRange range2 = [string rangeOfString:tempStr2];
            
            if ([tempStr1 compare:tempStr2]==NSOrderedAscending) {
                
                
                [string replaceCharactersInRange:range2 withString:tempStr1];
                [string replaceCharactersInRange:range1 withString:tempStr2];
            }
            }
        }
    return string;
}


+(NSString *) replaceTheString:(NSString *) str1
                    fromString:(NSString *) str2
                      toString:(NSString *) str3
{
    NSMutableString *string = [NSMutableString stringWithString:str2];
    
    NSRange range = [string rangeOfString:str1];
    [string replaceCharactersInRange:range withString:str3];
    return string;
}

+(NSInteger) obtainTheLength:(NSString *) str1
{
    return str1.length;
}




@end







#import <Foundation/Foundation.h>
#import "MyStringTools.h"

int main(int argc, const char * argv[]) {
    @autoreleasepool {
        
        NSString *mystring=[NSString stringWithFormat:@"abcdef"];
        
        NSLog(@"%@",[MyStringTools reverseOrder:mystring]);
        
        NSLog(@"%@",[MyStringTools deleteTheString:@"bc"
                                          inString:mystring]);
        
        NSLog(@"%ld",[MyStringTools findNumberOfString:@"bc"
                                              inString:@"abcdfebcbbc"]);
        
        NSLog(@"%@",[MyStringTools makeUpString:@"abcdef"
                                      andString:@"gh"]);
        
        NSLog(@"%@",[MyStringTools convertLetters:@"aBcDeF"
                                          andCase:@"大写"]);
        
        NSLog(@"%@",[MyStringTools compressString:@"hhfffkkkkkiinil"]);
        
        NSLog(@"%@",[MyStringTools theStringOrder:@"sadcbfw"]);
        
        NSLog(@"%@",[MyStringTools replaceTheString:@"sdf"
                                         fromString:@"asdfghjkl"
                                           toString:@"abc"]);
        
        NSLog(@"%lu",[MyStringTools obtainTheLength:@"qwert"]);
        
        

    }
    return 0;
}