OC系列foundation Kit基础－NSMutableString

一.可变字符串创建

1.非法创建的方式

NSMutalbeString *mStr = @"abc";

2.通过构造方法创建可变字符串

NSMutableString *mStr1 = [[NSMutableString alloc]initWithString:@"abc"];
NSMutableString *mStr2 = [[NSMutableString alloc]initWithUTF8String:"abc"];
NSMutableString *mStr3 = [[NSMutableString alloc]initWithFormat:@"%@%c",@"ab",'c'];

3.通过类方法创建可变字符串

NSMutableString *mStr4 = [NSMutableString stringWithString:@"abc"];
NSMutableString *mStr5 = [NSMutableString stringWithUTF8String:"abc"];
NSMutableString *mStr6 = [NSMutableString stringWithFormat:@"%@%c",@"ab",'c'];

二.可变字符串特性

首先创建一个空的可变字符串

NSMutableString *mStr = [[NSMutableString alloc]init];

1.添加字符串(setString,appendString,insertString)

[mStr setString:@"abc"];
[mStr appendString:@"def"];
[mStr insertString:@"gh" atIndex:3];
NSLog(@"mStr is %@",mStr);

　　输出结果:

2016-06-27 11:43:51.242 OcTest[698:466304] mStr is abcghdef
Program ended with exit code: 0

2.删除指定位置的字符串(deleteCharactersInRange)

[mStr deleteCharactersInRange:NSMakeRange(4, 3)];
NSLog(@"mStr is %@",mStr);

　　输出结果:

2016-06-27 11:46:37.775 OcTest[708:481615] mStr is abcgf
Program ended with exit code: 0

3.查询方法和NSString方法一样(rangeOfString)

4.替换指定范围内的字符串(replaceCharactersInRange)

[mStr replaceCharactersInRange:NSMakeRange(2, 2) withString:@"XXXXXX"];
NSLog(@"mStr is %@",mStr);

　　输出结果:

2016-06-27 11:51:16.773 OcTest[738:503275] mStr is abXXXXXXf
Program ended with exit code: 0