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