// Create view model array of key buttons
let keyButtons: [KeyboardAccessoryButton] = [
    // Create button with built-in type and tap handler block
    KeyboardAccessoryButton(type: .undo, tapHandler: { [weak self] in
        self?.undo()
    }),
    // Create button with UIImage
    KeyboardAccessoryButton(image: UIImage(named: "img"), tapHandler: {}),
    // Create button with UIMenu
    KeyboardAccessoryButton(type: .link, menu: createInsertMenu()),
]

// Initialize `KeyboardAccessoryView`
let accessoryView = KeyboardAccessoryView(
    frame: CGRect(x: 0, y: 0, width: view.frame.width, height: 0),
    keyButtons: keyButtons,
    showDismissKeyboardKey: true,
    delegate: self)

// Assign the accessory view instance to `UITextView`
textView.inputAccessoryView = accessoryView

// Set tint color for the whole view
accessoryView.tintColor = .systemPink
// ...or at a given index
accessoryView.setTintColor(.systemGreen, at: 5)

// Set enabled at a given index
accessoryView.setEnabled(false, at: 1)