斯威夫特無法獲取回調

Question

我在我的一個viewcontroller中添加了一個注釋框，例如

private lazy var toolbarView: KeyboardToolbar = {
    guard let keyboardToolbar = Bundle.main.loadNibNamed("KeyboardToolbar", owner: self, options: nil)?.first as? KeyboardToolbar else {
        fatalError("Error") 
    }
    return keyboardToolbar
}()
override var inputAccessoryView: KeyboardToolbar? {
    return toolbarView
}

現在在鍵盤工具欄的快捷文件中

@IBAction func sendPressed(_ sender: Any) {
    //called on click of send button in the comment box
}

我該如何在viewcontroller代碼中編寫一個函數，該函數在注釋框中的sendPressed上執行。

完整的鍵盤工具欄代碼

class KeyboardToolbar: UIView, UITextViewDelegate {

@IBOutlet weak var textView: UITextView!



override func awakeFromNib() {
    super.awakeFromNib()

    textView.delegate = self
    autoresizingMask = .flexibleHeight
    textView.isScrollEnabled = false
    textView.text = "Comment"
    textView.textColor = UIColor.lightGray
    textView.becomeFirstResponder()
}

override var intrinsicContentSize: CGSize {
    let textSize = textView.sizeThatFits(CGSize(width: textView.bounds.size.width, height: CGFloat.greatestFiniteMagnitude))
    return CGSize(width: bounds.width, height: textSize.height)
}
func textViewDidBeginEditing(_ textView: UITextView) {
    if textView.textColor == UIColor.lightGray {
        textView.text = nil
        textView.textColor = UIColor.black
    }
}
func textViewDidChange(_ textView: UITextView) {
    invalidateIntrinsicContentSize()
}

@IBAction func sendPressed(_ sender: Any) {

}
}

Answer 1

您可以為KeyboardToolBar創建自定義協議

protocol KeyboardToolBarDelegates: class {
    func sendPressed(_ text: String)
}

現在您可以在KeyboardToolBar中創建委托對象

class KeyboardToolbar: UIView, UITextViewDelegate {
     @IBOutlet weak var textView: UITextView!
     weak var delegate: KeyboardToolBarDelegates?

     @IBAction func sendPressed(_ sender: Any) {
        delegate?.sendPressed("Pass your text")
     }

}

在您的viewcontroller中實現Delegate：

class mainViewController: UIViewController, KeyboardToolBarDelegates {
   private lazy var toolbarView: KeyboardToolbar = {
       guard let keyboardToolbar = Bundle.main.loadNibNamed("KeyboardToolbar", owner: self, options: nil)?.first as? KeyboardToolbar else {
          fatalError("Error") 
       }
       keyboardToolbar.delegate = self
       return keyboardToolbar
   }()
   override var inputAccessoryView: KeyboardToolbar? {
      return toolbarView
   }

   //Add protocol method
   func sendPressed(_ text: String) {
       //Method will be called when send pressed from the KeyboardToolBar
   }
}