Objective-C:NSMutableString类的常见操作

//
//  main.m
//  03-NSMutableString
//
//  Created by ma c on 15/8/17.
//  Copyright (c) 2015年. All rights reserved.
//

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{
@autoreleasepool
{
//可变字符串的常用操作
//1.创建（给一个固定的容量）
NSMutableString *str1 = [NSMutableString stringWithCapacity:32];
//2.添加内容（在尾部添加）
[str1 appendString:@"hello world"];
NSLog(@"str1 = %@",str1);
[str1 appendFormat:@"%d",123];
NSLog(@"str1 = %@",str1);

//3.在索引处插入内容
[str1 insertString:@"OK " atIndex:6];
NSLog(@"%@",str1);

//4.替换内容
NSRange range = [str1 rangeOfString:@"world"];
[str1 replaceCharactersInRange:range withString:@"WORLD"];
NSLog(@"%@",str1);

//5.删除内容
[str1 deleteCharactersInRange:range];
NSLog(@"%@",str1);

//6.完全设置成其他的字符串
[str1 setString:@"how are you"];
NSLog(@"%@",str1);

}
return 0;
}