UITextField - Allow only numbers and punctuation input/keypad

萝らか妹 提交于 2019-11-30 07:25:29
Kalpesh

Try this

Make a macro

#define ACCEPTABLE_CHARACTERS @"0123456789."

And use it

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

    if (textField==textFieldAmount)
    {
        NSCharacterSet *cs = [[NSCharacterSet characterSetWithCharactersInString:ACCEPTABLE_CHARACTERS] invertedSet];

        NSString *filtered = [[string componentsSeparatedByCharactersInSet:cs] componentsJoinedByString:@""];

        return [string isEqualToString:filtered];
    }
    return YES;
}

Just use

[textField setKeyboardType:UIKeyboardTypeNumbersAndPunctuation];

after creating your textfield.

How about a custom character set? Something like this:

NSCharacterSet *testChars = [NSCharacterSet characterSetWithCharactersInString:@"0123456789+*#-() "];

Because setting the keyboard type is pretty useless on iPad...

In Swift 3:

func textField(_ textField: UITextField, shouldChangeCharactersIn range: NSRange, replacementString string: String) -> Bool {
    let allowedCharacters = "0123456789!@#$%^&*()_+~:{}|\"?><\\`,./;'[]=-"
    return allowedCharacters.contains(string) || range.length == 1
}
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