//是否是純數字 + (BOOL)isNumText:(NSString *)str{  NSString * regex  = @"(/^[0-9]*$/)";  NSPredicate * pred  = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];  BOOL isMatch   = [pred evaluateWithObject:str];  if (isMatch) {   return YES;  }else{   return NO;  } }

- (NSString *) trimming {  return [self stringByTrimmingCharactersInSet: [NSCharacterSet whitespaceCharacterSet]]; } //判斷是不是純數字  [NSCharacterSet decimalDigitCharacterSet];  if ([[textField.text stringByTrimmingCharactersInSet: [NSCharacterSet decimalDigitCharacterSet]]trimming].length >0) {   DLog(@"不是純數字");  }else{   DLog(@"純數字！");  } 

//正則表達式匹配11位手機號碼  NSString *regex = @"^((13[0-9])|(15[^4,//D])|(18[0,0-9]))//d{8}$";  NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];  BOOL isMatch = [pred evaluateWithObject:_telField.text]; if(isMatch) { //有效手機號 }else//無效手機號  {    if (ios7) {     UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:nil message:@"無效的手機號碼,請重新輸入..." delegate:self cancelButtonTitle:nil otherButtonTitles:@"確定", nil nil];     alertView.tag = 104;     [alertView show];    }else    {     UIAlertController*alertController = [UIAlertController alertControllerWithTitle:nil message:@"無效的手機號碼,請重新輸入..." preferredStyle:UIAlertControllerStyleAlert];     UIAlertAction *otherAction = [UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDefault handler:^(UIAlertAction*action) {      [_telField selectAll:self];     }];     [alertController addAction:otherAction];     [self presentViewController:alertController animated:YES completion:nil];    }   }  }