如何在不同的textFields上应用不同的验证(max char)

Question

我有两个文本字段，一个是Zip，另一个是电话号码。我想验证zip文本字段只包含6位数字的号码和电话号码文本字段只包含10位数字的号码。我使用下面的代码。我有困难的是，我不能同时验证两个文本字段。enter code here

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    if(textField.tag != 10 && textField.tag !=11)
    if(string.length == 0)
        return YES;
    if (zipTxt.text.length == 6)
        return NO;
    if(phoneTxt.text.length == 10)
        return NO;
    NSCharacterSet *nonNumberSet = [[NSCharacterSet decimalDigitCharacterSet] invertedSet];
    if ([string rangeOfCharacterFromSet:nonNumberSet].location != NSNotFound)
    {
        return NO;
    }
    return YES;
}

-(BOOL)textFieldShouldEndEditing:(UITextField *)textField
{
    if (textField.tag == 10)
    {
        if (zipTxt.text.length<6)
        {
            UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Error" message:@"Please enter a valid zip number" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
            [alert show];
        }
    }
    if (textField.tag ==11)
    {
         if(phoneTxt.text.length < 10)
        {
            UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"Error" message:@"Please enter a valid phone number" delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
            [alert show];
        }
    }
    return YES;
}

Answer 1

您的Zip和电话号码都是整数文本字段，那么为什么不将文本字段的keyboardtype更改为numberpad呢?然后，在你的shouldChangeCharactersInRange

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
 {
       NSString * currentStr = [textField.text stringByReplacingCharactersInRange:range withString:string];
       if (textfield.tag == 10 && currentStr.length == 6) // Zip Textfield 
       {
          return false;
       }
       if (textfield.tag == 11 && currentStr.length == 10) // Phone Textfield 
       {
          return false;
       }
}

Answer 2

试试这个:

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
if(range.length + range.location > textField.text.length)
{
    return NO;
}
NSUInteger newLength = [textField.text length] + [string length] - range.length;
if(textField == ziptextField){
   return newLength <= 6;
 }
else if(textField == phonenukmbertextField){
   return newLength <= 10;
 }
 return YES;