Object-C 字符串类各种操作方法

转自：http://blog.youkuaiyun.com/newjerryj/article/details/6262893

    NSString  *str=@"every day  keep up";

    NSMutableString *mstr;

    

    mstr=[NSMutableString stringWithString:str]; //初始化可变字符串

     NSLog(@"1mstr is:  %@",mstr);

    

    [mstr insertString:@"xiaxia" atIndex:[mstr length]];//在指定位置插入字符串

     NSLog(@"2mstr is:  %@",mstr);

    [mstr appendString:@"append"]; // 链接新字符串

     NSLog(@"3mstr is:  %@",mstr);

    [mstr deleteCharactersInRange:NSMakeRange(1, 3)];// 删除某个range的字符串

     NSLog(@"4mstr is:  %@",mstr);

    [mstr setString:@"new"];

     NSLog(@"5mstr is:  %@",mstr);

    [mstr replaceCharactersInRange:NSMakeRange(1, 2) withString:@"ame"];  // 替换某个位置字符串

     NSLog(@"6mstr is:  %@",mstr);

    

    NSString *search=@"am";

    NSString *replace=@"helleee";

    NSRange substr;

    substr=[mstr rangeOfString:search];

    NSLog(@"%lu, %lu",(unsigned long)substr.location, (unsigned long)substr.length);

    if (substr.location != NSNotFound) {

        [mstr replaceCharactersInRange:substr withString:replace];

    }// 查找替换某些字符串

    NSLog(@"7mstr is:  %@",mstr);

    search=@"e";

    replace=@"a";

    

    substr=[mstr rangeOfString:search];

    NSLog(@"%lu, %lu",(unsigned long)substr.location, (unsigned long)substr.length);

    while (substr.location != NSNotFound) {

        [mstr replaceCharactersInRange:substr withString:replace];

        substr=[mstr rangeOfString:search];

        NSLog(@"%lu, %lu",(unsigned long)substr.location, (unsigned long)substr.length);

    }

    

    NSLog(@"mstr is:  %@",mstr);

 

运行结果：

2015-11-13 17:27:29.022 CC[6645:332973] 1mstr is:  every day  keep up

2015-11-13 17:27:29.022 CC[6645:332973] 2mstr is:  every day  keep upxiaxia

2015-11-13 17:27:29.022 CC[6645:332973] 3mstr is:  every day  keep upxiaxiaappend

2015-11-13 17:27:29.022 CC[6645:332973] 4mstr is:  ey day  keep upxiaxiaappend

2015-11-13 17:27:29.022 CC[6645:332973] 5mstr is:  new

2015-11-13 17:27:29.022 CC[6645:332973] 6mstr is:  name

2015-11-13 17:27:29.022 CC[6645:332973] 1, 2

2015-11-13 17:27:29.022 CC[6645:332973] 7mstr is:  nhelleeee

2015-11-13 17:27:29.023 CC[6645:332973] 2, 1

2015-11-13 17:27:29.023 CC[6645:332973] 5, 1

2015-11-13 17:27:29.023 CC[6645:332973] 6, 1

2015-11-13 17:27:29.023 CC[6645:332973] 7, 1

2015-11-13 17:27:29.023 CC[6645:332973] 8, 1

2015-11-13 17:27:29.023 CC[6645:332973] 9223372036854775807, 0

2015-11-13 17:27:29.023 CC[6645:332973] mstr is:  nhallaaaa