I need to create a custom keyboard for my app, but no sure the best way to do it without the user needing to add a keyboard in the settings. If I create a keyboard extension is it possible to set a UITextField's Keyboard Type to that custom keyboard? Or will I have to use a UIView to accomplish this?
You can add accessoryView to text view for you want to give a few extra buttons.
If you still looking for some more then please go through the below link. https://www.cocoacontrols.com/search?utf8=%E2%9C%93&q=keyboard
For a custom keyboard that is specific to a single app, create a view and assign the view to UITextField.inputView:
textField.inputView = YourCustomKeyboard()
In my search I didn't find a way to tack on additional keys but there are examples of custom keyboards using inputView that are easy to adapt.