- (void)viewDidLoad

{

    [super viewDidLoad];

    // Do any additional setup after loading the view.

    NSLog(@"--iphone--%@",[self getNewPhoneStr1:@"18502368888"]);

}

#pragma -mark -functions

//只需传一个电话进去，可以返回一个处理好的加了-线的400电话字符串，如传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;

}

2015-10-19 13:52:46.387 将400电话中间加上-线[6123:140629] --iphone--185-023-68888