I’m building a custom iOS keyboard using UIInputViewController. I want to toggle between my custom keyboard (with a custom view and accessory view) and the system keyboard (default QWERTY). However, when I try to reset inputView to show the system keyboard, I get a blank view instead.

Here’s what I’m doing in my showEnglishKeyboard function:

swift

private func showEnglishKeyboard() {
    // Hide custom panels
    suggestionPanel.isHidden = true
    accessoryView.isHidden = false

    // Reset to system keyboard
    self.resignFirstResponder() // Dismiss current keyboard
    DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) {
        self.inputView = nil // Reset inputView to default keyboard
        self.reloadInputViews() // Reload keyboard
        self.becomeFirstResponder() // Reactivate input controller
    }
    }

I’ve also overridden viewWillLayoutSubviews to ensure the height of the custom keyboard matches the system keyboard:

swift

override func viewWillLayoutSubviews() {
    super.viewWillLayoutSubviews()
    view.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 216) // Standard keyboard height
}

Additionally, I have an inputAccessoryView:

swift
override var inputAccessoryView: UIView? {
return accessoryView
}

The Problem:
When I toggle back to the system keyboard, I get a blank view instead of the default QWERTY keyboard. The accessoryView also disappears.

What I’ve Tried:
Using reloadInputViews() after setting inputView = nil.
Adding delays with DispatchQueue.main.asyncAfter to let the responder state settle.
Ensuring that becomeFirstResponder() is called after resetting inputView.
Debug Information:
view.frame logs show the correct width and height (e.g., 320×216 for an iPhone SE).
self.isFirstResponder returns true after calling becomeFirstResponder().
My Goal:
I want to:

Show the system keyboard (QWERTY) when inputView is reset to nil.
Keep the inputAccessoryView visible at the top.
What am I missing? How can I fix this issue? Any help would be greatly appreciated!