iOS手机号码 344 格式

//手机号码344格式
+(NSString*)phoneNumFommat:(NSString*)phoneNum{
    NSString *tenDigitNumber = [phoneNum stringByReplacingOccurrencesOfString:@" " withString:@""];
    if (tenDigitNumber.length > 11) {
        tenDigitNumber = [tenDigitNumber substringToIndex:11];
    }
    if (tenDigitNumber.length > 7) {
        tenDigitNumber = [tenDigitNumber stringByReplacingOccurrencesOfString:[NSString stringWithFormat:@"(\\d{3})(\\d{4})(\\d{%lu})",(tenDigitNumber.length - 7)]
                                                                   withString:@"$1 $2 $3"
                                                                      options:NSRegularExpressionSearch
                                                                        range:NSMakeRange(0, [tenDigitNumber length])];
    }else if (tenDigitNumber.length > 3){
        tenDigitNumber = [tenDigitNumber stringByReplacingOccurrencesOfString:[NSString stringWithFormat:@"(\\d{3})(\\d{%lu})",(tenDigitNumber.length - 3)]
                                                                   withString:@"$1 $2"
                                                                      options:NSRegularExpressionSearch
                                                                        range:NSMakeRange(0, [tenDigitNumber length])];
    }
    return tenDigitNumber;
}