How to restrict user to enter character in phone UITextField

When you want user to enter only number (like in case of mobile number) then you can restrict using this

1. Put a macro before @implementation   

   #define NUMERIC @"1234567890"


2. textField DelegateMethod   
  
- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    NSCharacterSet *unacceptedInput = nil;
    if(textField== self. phoneTextField)
    {
        unacceptedInput = [[NSCharacterSet characterSetWithCharactersInString:NUMERIC] invertedSet];
    }
    return ([[string componentsSeparatedByCharactersInSet:unacceptedInput] count] <= 1);
}

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