NSMutableString可变字符串方法

////  main.m//  NSMutableString////  Created by Rayln Guan on 9/3/13.//  Copyright (c) 2013 Rayln Guan. All rights reserved.//#import <Foundation/Foundation.h>int main(int argc, const char * argv[]){    @autoreleasepool {                //预先分配10个字数的内存空间        NSMutableString *str = [[NSMutableString alloc] initWithCapacity:10];        //设置字符串内容        [str setString:@"123"]; //str = 123;        //拼接一个字符串        [str appendString:@"567"]; // str = 123567        //拼接一个字符串        [str appendFormat:@"age is %i and height is %.2f", 10, 1.555f];        NSLog(@"%@", str); //str = 123567age is 10 and height is 1.55                //替换字符串        NSRange range = [str rangeOfString:@"age"];        [str replaceCharactersInRange:range withString:@"no"];        // str = 123567no is 10 and height is 1.55                //插入字符串        [str insertString:@"abc" atIndex:2]; //str = 12abc3567no is 10 and height is 1.55                //删除字符串        range = [str rangeOfString:@"abc"];        [str deleteCharactersInRange:range]; // str = 123567no is 10 and height is 1.55    }    return 0;}

另外，NSMutableString可用NSString所有的方法！！