TextField Validation

I have a TextField in my iPad application. I want the "Number Pad" to come on touch (without the p开发者_Go百科unctuation marks and Alphabet Keyboard Button).How do I do that ? How to validate the TextField ?

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NSString *nameRegex =@"[0-9]"; 
NSPredicate *nameTest = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", nameRegex]; 
BOOL isNumber=[nameTest evaluateWithObject:string];

if(isNumber) {
  // valid number found
} else {
  // error message
}

Use this validation code in the UITextField delegate method textField:shouldChangeCharactersInRange:replacementString: to prevent the user from even entering an invalid value.

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Set the textField keyboard = NumberPad in your interface builder.

Thanks

Mitesh

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You cannot get a number pad on ipad.You yourself have to put a check what the user has entered from keyboard, if its not number show them an alert to enter numbers.

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You can also use with askee mumber validation as below I have made validation in which I have consider onley numeric and back button.

 - (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string{

  if([string isEqualToString:[NSString stringWithFormat:@"%c", 48]]||[string isEqualToString:[NSString stringWithFormat:@"%c", 49]] ||[string isEqualToString:[NSString stringWithFormat:@"%c", 50]] ||[string isEqualToString:[NSString stringWithFormat:@"%c", 51]] ||[string isEqualToString:[NSString stringWithFormat:@"%c", 52]] ||[string isEqualToString:[NSString stringWithFormat:@"%c", 53]] ||[string isEqualToString:[NSString stringWithFormat:@"%c", 54]] ||[string isEqualToString:[NSString stringWithFormat:@"%c", 55]] ||[string isEqualToString:[NSString stringWithFormat:@"%c", 56]] ||[string isEqualToString:[NSString stringWithFormat:@"%c", 57]] || [string isEqualToString:[NSString stringWithFormat:@"%c", 46]]||[string isEqualToString:@""])

    {

    if(textField==myText)
        return  YES;
    else 
        return NO;
}
else 
    return NO;
}

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Here's a number pad implementation for the iPad: https://github.com/IngmarStein/NumericKeypad

Disclaimer: it's my own fork of azu's NumericKeypad