I have a custom text view I made using CoreText which implements UITextInput to handle multi stage input on Japanese and Chinese keyboards. I'm trying to limit the number of characters that can be typed into the text view using shouldChangeTextInRange:replacementText: and I'm noticing that it's only called when a key on the keyboard is pushed, but not when a button on the thing above the keyboard which offers replacement suggestions is pushed (example below).
Does anyone know why this is and if there are any similar methods I can implement that will be called when a suggestion above the keyboard is pushed (so I can block them from being set as marked text)?