A lot of people have been saying this is a bug, but being that this problem still exists in the GM I’m starting to think it might be a change in logic. With that said, I wrote this bit of code for my app and have tested it on iOS 7-8. Add the following method … Read more
Use the UITextFieldDelegate method -textField:shouldChangeCharactersInRange:replacementString: with an NSCharacterSet containing the inverse of the characters you want to allow. For example: // in -init, -initWithNibName:bundle:, or similar NSCharacterSet *blockedCharacters = [[[NSCharacterSet alphanumericCharacterSet] invertedSet] retain]; – (BOOL)textField:(UITextField *)field shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)characters { return ([characters rangeOfCharacterFromSet:blockedCharacters].location == NSNotFound); } // in -dealloc [blockedCharacters release]; Note that you’ll need … Read more
From proper way to do uitextfield text change call back: I catch the characters sent to a UITextField control something like this: // Add a “textFieldDidChange” notification method to the text field control. In Objective-C: [textField addTarget:self action:@selector(textFieldDidChange:) forControlEvents:UIControlEventEditingChanged]; In Swift: textField.addTarget(self, action: #selector(textFieldDidChange), for: .editingChanged) Then in the textFieldDidChange method you can examine the … Read more