CODEWITHSUNDEEP
iphoneobjective-ccocoa-touchipadios
Altealice
Altealice

Reputation: 3572

Handling non-ascii characters in textField:shouldChangeCharactersInRange:replacementString:

I'm trying to prevent Chinese (or otherwise, all non-ascii characters) from being input into a UITextField. As seen in other posts, I implemented textField:shouldChangeCharactersInRange:replacementString:, but when I enter Chinese words from the word-list-thing that appears on top of the keyboard after you press a few keys, the textField:shouldChangeCharactersInRange:replacementString: method does not fire.

Any ideas?

Upvotes: 2

Views: 1258

Answers (1)

Manny
Manny

Reputation: 6287

A workaround you can take is to use:

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textChanged:) name:UITextViewTextDidChangeNotification object:nil];

then in your function:

- (void)textChanged:(NSNotification *)notification{
  //remove observer
  [[NSNotificationCenter defaultCenter] removeObserver:self name:UITextViewTextDidChangeNotification object:nil];

  //change your textfield's value here e.g.
  myTextField.text = [MyUtils removeNonAsciiChar:myTextField.text];

  //add observer again
  [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(textChanged:) name:UITextViewTextDidChangeNotification object:nil];
}

Note however that this is more costly since you will be replacing the entire string everytime, but it should be okay if you're not expecting a very long string.

Upvotes: 2

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