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c#iosxamarin.iosuitextfieldkeypress

How can I detect a KeyPress event in UITextField?

In UITextView there is a Changed event to handle keypress. However the UITextField has not such event.

How can I detect a KeyPress event in UITextField?

There is a method described here using notifications, however the problem I have is that I cannot unsubscribe from the TextFieldTextDidChangeNotification.

Solution

  • I'm not sure which is your question. The first one you seem to have answered yourself, i.e. the solution (from your link) is to use NSNotificationCenter.DefaultCenter.AddObserver.

    The second is about unsubscribing - if you want to stop observing you should call the previous method counterpart, i.e. NSNotificationCenter.DefaultCenter.RemoveObserver.

    Just keep the object returned from AddObserver so you can supply it to RemoveObserver.

    note: If I did not understand your question correctly please use edit and add some details and/or code of what you want to achieve and we'll do our best to help :-)