Custom keyboard that mimics the default iOS "globe" button - ios

Question

In iOS keyboards there is a globe button that if held will show a pop-up list of keyboards that the user can switch to.
However in the KeyboardViewController class, the only method I see to make a keyboard switch button is the method:
self.advanceToNextInputMode()
The problem with this is that while it allows you to create a button that if clicked will switch keyboards this method does not allow you to create a button that if you press and hold will show the list of currently enabled keyboards that the user can switch to by moving their finger to the correct entry.
How can I mimic the default iOS globe keyboard button behavior?

Answer 1

// Launch inputMode list above the view when long pressing or swiping up from the view,
// Advance to nextInputMode when short tapping on the view.
// Example:
[KeyboardButton addTarget:self action:#selector(handleInputModeListFromView:withEvent:) forControlEvents:UIControlEventAllTouchEvents].
(void)handleInputModeListFromView:(nonnull UIView *)view withEvent:(nonnull UIEvent *)event NS_AVAILABLE_IOS(10_0);
Swift Code
override func viewDidLoad() {
super.viewDidLoad()
// Perform custom UI setup here
self.nextKeyboardButton = UIButton(type: .system)
self.nextKeyboardButton.setTitle(NSLocalizedString("Next Keyboard", comment: "Title for 'Next Keyboard' button"), for: [])
self.nextKeyboardButton.sizeToFit()
self.nextKeyboardButton.translatesAutoresizingMaskIntoConstraints = false
self.nextKeyboardButton.addTarget(self, action: #selector(handleInputModeList(from:with:)), for: .allTouchEvents)
self.view.addSubview(self.nextKeyboardButton)
self.nextKeyboardButton.leftAnchor.constraint(equalTo: self.view.leftAnchor).isActive = true
self.nextKeyboardButton.bottomAnchor.constraint(equalTo: self.view.bottomAnchor).isActive = true
}