[摘要]本文是對將400電話中間加上-線的講解，對學習IOS蘋果軟件開發有所幫助,與大家分享。

代碼：

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    NSLog(@"--iphone--%@",[self getNewPhoneStr1:@"18502368888"]);
    
}
//只需傳一個電話進去，可以返回一個處理好的加了-線的400電話字符串，如傳4001234567，返回400-123-4567
- (NSString *)getNewPhoneStr1:(NSString *)phonestr
{
    if ([phonestr rangeOfString:@"-"].length == 0 && phonestr.length > 6) {
        NSMutableString *phoneNumber = [NSMutableString string];
        NSString *subStr = [phonestr substringToIndex:3];
        [phoneNumber appendFormat:@"%@-",subStr];
        subStr = [phonestr substringWithRange:NSMakeRange(3, 3)];
        [phoneNumber appendFormat:@"%@-",subStr];
        subStr = [phonestr substringWithRange:NSMakeRange(6, phonestr.length-6)];
        [phoneNumber appendString:subStr];
        
        phonestr = phoneNumber;
    }
    
    return phonestr;
}

輸出：

2014-12-02 17:14:26.807 將400電話中間加上-線[21611:60b] --iphone--185-023-68888