ios的NSMutableString用法

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详见代码：

////  main.m//  Foundation5-NSMutableString////  Created by mj on 13-4-5.//  Copyright (c) 2013年 itcast. All rights reserved.//#import <Foundation/Foundation.h>#pragma mark 可变字符串的创建void stringCreate() {    // 预先分配10个字数的存储空间    NSMutableString *str = [[NSMutableString alloc] initWithCapacity:10];    // 设置字符串内容    [str setString:@"1234"];        // 拼接一个字符串    [str appendString:@"567"];    // 拼接字符串    [str appendFormat:@"age is %i and height is %.2f", 27, 1.55f];        // 替换字符串    NSRange range = [str rangeOfString:@"height"];//查找字符串height的位置    [str replaceCharactersInRange:range withString:@"no"];        // 插入字符串    [str insertString:@"abc" atIndex:2];        // 删除字符串    range = [str rangeOfString:@"age"];    [str deleteCharactersInRange:range];    NSLog(@"%@", str);        // 释放对象    [str release];}int main(int argc, const char * argv[]){    @autoreleasepool {        stringCreate();    }    return 0;}