iOS开发NSString篇:字符串每隔几个字符插入某个字符

e.g

卡号:1234567890123456789
需求:将该卡号每四个字符用空格分隔
结果:1234 5678 9012 3456 789

算法思路:

遍历字符串,每隔4个字符插入一个空格

iOS代码实现:

//每隔4个字符添加一个空格的字符串算法
- (NSString *)dealWithString:(NSString *)number
{
    NSString *doneTitle = @"";
    int count = 0;
    for (int i = 0; i < number.length; i++) {

        count++;
        doneTitle = [doneTitle stringByAppendingString:[number substringWithRange:NSMakeRange(i, 1)]];
        if (count == 4) {
            doneTitle = [NSString stringWithFormat:@"%@ ", doneTitle];
            count = 0;
        }
    }
    NSLog(@"%@", doneTitle);
    return doneTitle;
}

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