Snail—OC学习之可变字符串NSMutableString

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NSMutableString 继承于NSString 所以NSSting的所有方法NSMutableString都继承 并且也可以用

下面有两个方法NSString没有的

<span style="font-size:14px;">//长度为0 同样表示空的字符串
        NSMutableString * str3 = [[NSMutableString alloc] initWithCapacity:0];</span>

<span style="font-size:14px;">//类方法的创建形式  空的
        NSMutableString * str4 = [NSMutableString string];</span>

<span style="font-size:14px;">//重置字符串 str1 = @"dsa";
        NSMutableString * str1 = [[NSMutableString alloc] initWithString:@"dsa"];
        // str1 = @"s1s2s3ss";
        [str1 setString:@"s1s2s3ss"];
        //格式化的形式追加字符串 str1 = @"s1s2s3ss1";
        [str1 appendFormat:@"%d",1];
        //追加一个字符串 str1 = @"s1s2s3ss1asd";
        [str1 appendString:@"asd"];
       
        //删除字符串  range = {3,3};
        NSRange range = NSMakeRange(3, 3);
        // str1 = @"s1sss1asd"; 删除的字符串是s2s
        [str1 deleteCharactersInRange:range];
        NSLog(@"%@",str1);
        //插入字符串 在下标为3的地方插入,这里对要插入的字符串长度没限制,不会覆盖掉原来后面的字符串
        [str1 insertString:@"UUUUUU" atIndex:3];
        NSLog(@"%@",str1);  //str1 = @"s1sUUUUUUss1asd";
        //替换字符串
        [str1 replaceCharactersInRange:NSMakeRange(3, 7) withString:@"AAAAAAAAAAA"];
        NSLog(@"%@",str1); //str1 = @"s1sAAAAAAAAAAAs1asd";
</span>

<span style="font-size:14px;">/*
         10.将原字符串进行小写转大写，大写转小写
         */
        NSMutableString * str101 = [[NSMutableString alloc]initWithFormat:@"%@",@"HeHeDa"];
        NSMutableString * str102 = [[NSMutableString alloc] init];
        for (int i = 0; i < str101.length; i++) {
            unichar tempChar = [str101 characterAtIndex:i];
            if (tempChar >= 65 && tempChar <= 90) {
                NSMutableString * tempString1 = [[NSMutableString alloc] initWithFormat:@"%c",tempChar];
                NSString * str103 = [tempString1 lowercaseString];
                [str102 appendString:str103];
            }
            else{
                NSMutableString * tempString2 = [[NSMutableString alloc] initWithFormat:@"%c",tempChar];
                NSString * str104 = [tempString2 uppercaseString];
                [str102 appendString:str104];
            }
        }
        NSLog(@"%@",str102);
         
        
        
        /*
         11.对字符串按字母顺序进行排序
         比如输入@“aczabczab”输出@“aaabbcczz”
         */
        
        NSMutableString * str111 = [[NSMutableString alloc]initWithFormat:@"%@",@"aczabczab"];
        for (int i = 0; i < str111.length - 1; i++) {
            for (int j = i + 1; j < str111.length; j++) {
                unichar ci = [str111 characterAtIndex:i];
                unichar cj = [str111 characterAtIndex:j];
                if (ci > cj) {
                    NSRange iRange = {i,1};
                    NSRange jRange = {j,1};
                    [str111 replaceCharactersInRange:iRange withString:[[NSString alloc] initWithFormat:@"%c",cj]];
                    [str111 replaceCharactersInRange:jRange withString:[[NSString alloc] initWithFormat:@"%c",ci]];
                }
            }
        }
        NSLog(@"%@",str111);
        
        
        
        /*
         12.使用NSLog打印99乘法表
         */
        
        for (int i = 1; i < 10; i++) {
            NSMutableString * str121 = [[NSMutableString alloc] init];
            for (int j = 1; j <= i; j++) {
                [str121 appendFormat:@"%d*%d=%d\t",j,i,i * j];
            }
            NSLog(@"%@",str121);
        }
</span>

Snail—OC学习之可变字符串NSMutableString

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原文地址：http://blog.csdn.net/qq1791422018/article/details/46973059