How to programmatically change keyboard in iOS?

Question

I would like to programmatically change keyboard when I click a button event.

I used custom keyboard in my app, but I need to change English (US) keyboard in programmatically when I click a button on my custom keyboard.

Answer 1

The only way you can control the keyboard is by showing it (By setting a UITextView/UITextField as a first responder), hiding it (by resigning the editing Easy way to dismiss keyboard?).

The language of the keyboard cannot be changed by your app, since it is a user preference. If you want a custom keyboard of your own, you would have to design it yourself (with UIButtons) and obviously also program it (when it shows, when it hides. I would simply use the keyboard that the user prefers, why do you need to change it? After all, the user is the one that decides which keyboard he uses.