jamesaq12wsx

override func viewDidLoad() {
        //...
        
        let keyboardAccessoryView = CustomAccessoryView(frame: CGRect(x: 0, y: 0, width: 30, height: 30))
        
        keyboardAccessoryView.delegate = self
        
        textField.inputAccessoryView = keyboardAccessoryView
    }

jamesaq12wsx

//1
protocol KeyboardDelegate: class {
    func keyWasTapped(input: Int)
}

class MyKeyboard: UIView {
    
    //2
    @IBOutlet weak var Btn1: UIButton!
    @IBOutlet weak var Btn2: UIButton!

jamesaq12wsx

func switchKeyboard() {
  print("switch keyboard")
  textField.endEditing(true);
  if textField.inputView == nil {
    textField.inputView = myKeyBoard
  }else{
    textField.inputView = nil
  }
  textField.becomeFirstResponder()
}

jamesaq12wsx

protocol SwitchKeyboardDelegate: class {
    func switchKeyboard()
}

class CustomAccessoryView: UIView {

    weak var delegate: SwitchKeyboardDelegate!
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)

jamesaq12wsx

//ViewController 繼承 KeyboardDelegate
ViewController: UIViewController, KeyboardDelegate {
  override func viewDidLoad() {
  super.viewDidLoad()
  // Do any additional setup after loading the view, typically from a nib.
  // 初始化鍵盤
  let keyboardView = MyKeyboard(frame: CGRect(x: 0, y: 0, width: 0, height: 300))
  // 當鍵盤有按鍵按下後，會通知ViewController
  keyboardView.delegate = self
  // 設定input為自定義鍵盤