Object-C中的字符串对象2-可变字符串

//
//  main.m
//  字符串-可变字符串
//
//  Created by zhangqs008 on 14-2-13.
//  Copyright (c) 2014年 zhangqs008. All rights reserved.
//

#import <Foundation/Foundation.h>

int main(int argc, const char * argv[])
{

    @autoreleasepool {

        NSString *str1=@"this is string A";
        NSString *search;
        NSString *replace;
        NSMutableString *mutableStr;
        NSRange subStr;

        //01.从不可变字符串创建可变字符串
        mutableStr=[NSMutableString stringWithString:str1];
        NSLog(@"01 %@",mutableStr);

        //02.插入字符,注意：是直接修改的字符串对象，无返回值
        [mutableStr insertString:@" mutable" atIndex:7];
        NSLog(@"02 %@",mutableStr);

        //03.插入末尾进行有效拼接
        [mutableStr insertString:@" and string B" atIndex:[mutableStr length]];
        NSLog(@"03 %@",mutableStr);

        //04.直接用appendString
        [mutableStr appendString:@" and string C"];
        NSLog(@"04 %@",mutableStr);

        //05.根据范围删除字符串 deleteCharactersInRange（从*开始，删除*个字符）
        [mutableStr deleteCharactersInRange:NSMakeRange(16,13)];
        NSLog(@"05 %@",mutableStr);

        //06.查找然后将其删除
        subStr=[mutableStr rangeOfString:@"string B and "];
        if(subStr.location!=NSNotFound)
        {
            [mutableStr substringWithRange:subStr];
            NSLog(@"06 %@",mutableStr);

        }

        //07.直接设置为可变字符串
        [mutableStr setString:@"this is string A"];
        NSLog(@"07 %@",mutableStr);

        //08.替换一些字符
        [mutableStr replaceCharactersInRange:NSMakeRange(8, 8) withString:@"a mutable string"];
        NSLog(@"08 %@",mutableStr);

        //09.查找和替换
        search=@"this is";
        replace=@"An example of";

        subStr=[mutableStr rangeOfString:search];
        if(subStr.location!=NSNotFound)
        {
            [mutableStr replaceCharactersInRange:subStr withString:replace];
            NSLog(@"09 %@",mutableStr);
        }

        //10.查找和替换所有匹配项
        search=@"a";
        replace=@"X";
        subStr=[mutableStr rangeOfString:search];
        while (subStr.location!=NSNotFound) {
            [mutableStr replaceCharactersInRange:subStr withString:replace];
            subStr=[mutableStr rangeOfString:search];
        }
        NSLog(@"10 %@",mutableStr);

        //也可以这样写
        [mutableStr replaceOccurrencesOfString:search withString:replace options:nil range:NSMakeRange(0, [mutableStr length])];

        NSLog(@"10 %@",mutableStr);

    }
    return 0;
}

输出结果：

2014-02-13 20:38:30.074 05.字符串-可变字符串[997:303] 01 this is string A

2014-02-13 20:38:30.076 05.字符串-可变字符串[997:303] 02 this is mutable string A

2014-02-13 20:38:30.079 05.字符串-可变字符串[997:303] 03 this is mutable string A and string B

2014-02-13 20:38:30.079 05.字符串-可变字符串[997:303] 04 this is mutable string A and string B and string C

2014-02-13 20:38:30.080 05.字符串-可变字符串[997:303] 05 this is mutable string B and string C

2014-02-13 20:38:30.080 05.字符串-可变字符串[997:303] 06 this is mutable string B and string C

2014-02-13 20:38:30.081 05.字符串-可变字符串[997:303] 07 this is string A

2014-02-13 20:38:30.081 05.字符串-可变字符串[997:303] 08 this is a mutable string

2014-02-13 20:38:30.081 05.字符串-可变字符串[997:303] 09 An example of a mutable string

2014-02-13 20:38:30.082 05.字符串-可变字符串[997:303] 10 An exXmple of X mutXble string

2014-02-13 20:38:30.082 05.字符串-可变字符串[997:303] 10 An exXmple of X mutXble string

Program ended with exit code: 0