判断是否为正确的手机号码
NSString *patternTel = @"^1[0-9]{10}$";
NSRegularExpression *TelExp = [NSRegularExpression regularExpressionWithPattern:patternTel options:NSRegularExpressionCaseInsensitive error:&err];
NSTextCheckingResult * isMatchTel = [TelExp firstMatchInString:mobileTf.text options:0 range:NSMakeRange(0, [mobileTf.text length])];