Objective-C:NSMutableString类的常见操作

 1 //
 2 //  main.m
 3 //  03-NSMutableString
 4 //
 5 //  Created by ma c on 15/8/17.
 6 //  Copyright (c) 2015年. All rights reserved.
 7 //
 8 
 9 #import <Foundation/Foundation.h>
10 
11 int main(int argc, const char * argv[])
12 {
13     @autoreleasepool
14     {
15         //可变字符串的常用操作
16         //1.创建（给一个固定的容量）
17         NSMutableString *str1 = [NSMutableString stringWithCapacity:32];
18         //2.添加内容（在尾部添加）
19         [str1 appendString:@"hello world"];
20         NSLog(@"str1 = %@",str1);
21         [str1 appendFormat:@"%d",123];
22         NSLog(@"str1 = %@",str1);
23         
24         //3.在索引处插入内容
25         [str1 insertString:@"OK " atIndex:6];
26         NSLog(@"%@",str1);
27         
28         //4.替换内容
29         NSRange range = [str1 rangeOfString:@"world"];
30         [str1 replaceCharactersInRange:range withString:@"WORLD"];
31         NSLog(@"%@",str1);
32         
33         //5.删除内容
34         [str1 deleteCharactersInRange:range];
35         NSLog(@"%@",str1);
36         
37         //6.完全设置成其他的字符串
38         [str1 setString:@"how are you"];
39         NSLog(@"%@",str1);
40         
41     }
42     return 0;
43 }