Sunday, July 03, 2011

iOS Pro Tip: textFieldShouldClear

If you're using UITextFieldDelegate to manage the state of a save button (e.g., to disable saving if a field is empty), you're probably implementing the textField:shouldChangeCharactersInRange:replacementString: delegate method and checking for the field being empty. This will handle the case where the user causes the text field to become empty by deleting all characters, or selecting and cutting them. In this case, you should probably also implement textFieldShouldClear:, to handle the case where the user clicks on the text field clear widget (if it exists). It turns out that action does not call the ...shouldChangeCharacters... callback.

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