iOS 如何使 inputaccessoryview 中的 TextView 成为第一响应者？

Question

我想要附件 View 中的 TextView ，但只有当我在 ScrollView 中按下按钮时，附件 View 才应该可见，并且键盘应该与滑动时的 TextView 交互关闭。解决方案是什么？

Facebook Messenger 和 WhatsApp 做同样的事情，但即使键盘关闭，它们的附件 View 也可见，但我不想要它。

我的解决方案:我使附件 View 透明， TextView 是 ScrollView 的 subview ，我将 TextView 放在透明附件 View 的正上方，所以它看起来像附件 View 。但是当我这样做时， TextView 是不可触摸的，因为附件 View 窗口在它上面。

我的代码:

class ViewController: UIViewController, CustomKeyboardProtocol {

let textView = UITextView()
let button = UIButton()
let scrollView = UIScrollView()

override init(nibName nibNameOrNil: String?, bundle nibBundleOrNil: Bundle?) {
    super.init(nibName: nibNameOrNil, bundle: nibBundleOrNil)
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(notification:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide), name: NSNotification.Name.UIKeyboardDidHide, object: nil)
}

required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
}

override func viewDidLoad() {
    super.viewDidLoad()

    self.view.backgroundColor = .black

    scrollView.contentSize = CGSize(width: 10000, height: 10000)
    scrollView.keyboardDismissMode = .interactive
    scrollView.backgroundColor = .blue
    self.view.addSubview(scrollView)

    button.backgroundColor = .green
    button.frame = CGRect(x: 20, y: 20, width: 30, height: 30)
    button.addTarget(self, action: #selector(keyboard), for: .touchUpInside)
    scrollView.addSubview(button)

    textView.backgroundColor = .yellow
    textView.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.size.width, height: 40)
    self.view.addSubview(textView)
    textView.isHidden = true

    let accessoryView = CustomKeyboardAccessoryView(frame: CGRect(x: 0, y: 0, width: 100, height: 30))
    accessoryView.keyboardDelegate = self
    accessoryView.backgroundColor = .clear
    textView.inputAccessoryView = accessoryView
}

func keyboardFrameChanged(frame: CGRect) {
    textView.frame = CGRect(x: 0, y: frame.origin.y, width: UIScreen.main.bounds.size.width, height: 40)
}

@objc func keyboardWillShow(notification: Notification) {
    if let keyboardFrame = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue {
        let keyboardHeight = keyboardFrame.size.height
        print("keyboard height: \(keyboardHeight)")
        textView.frame = CGRect(x: 0, y: UIScreen.main.bounds.size.height - keyboardHeight, width: UIScreen.main.bounds.size.width, height: 40)
    }
}

@objc func keyboardWillHide() {
    textView.isHidden = true
    textView.frame = CGRect(x: 0, y: 0, width: UIScreen.main.bounds.size.width, height: 0)
}

@objc func keyboard() {
    if textView.isFirstResponder {
        textView.resignFirstResponder()
        textView.isHidden = true
    } else {
        textView.becomeFirstResponder()
        textView.isHidden = false
    }
}

override func viewWillLayoutSubviews() {
    super.viewWillLayoutSubviews()
    scrollView.frame = UIScreen.main.bounds
}

override var canBecomeFirstResponder: Bool {
    return true
}
}

protocol CustomKeyboardProtocol : NSObjectProtocol {
    func keyboardFrameChanged(frame : CGRect)
}

class CustomKeyboardAccessoryView: UIView {



weak var keyboardDelegate: CustomKeyboardProtocol? = nil

override func willMove(toSuperview newSuperview: UIView?) {
    if newSuperview == nil {
        self.superview?.removeObserver(self, forKeyPath: "center")
    }
    else{
        newSuperview?.addObserver(self, forKeyPath: "center", options: [NSKeyValueObservingOptions.new, NSKeyValueObservingOptions.initial], context: nil)
    }
}

override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
    if let theChange = change as [NSKeyValueChangeKey : AnyObject]? {
        if theChange[NSKeyValueChangeKey.newKey] != nil {
            if self.keyboardDelegate != nil && self.superview?.frame != nil {
                self.keyboardDelegate?.keyboardFrameChanged(frame: (self.superview?.frame)!)
            }
        }
    }


   }
}

Answer 1

一种解决方法是使用 textView 属性来切换键盘，但将其隐藏在这样的键盘方法中

  @objc func keyboard() {
        if textView.isFirstResponder {
            textView.resignFirstResponder()
            textView.isHidden = true
        } else {
            textView.becomeFirstResponder()
            textView.isHidden = true
        }
    }

并创建单独的 View customView并将其添加到textView(上面提到的textView)的inputAccessoryView中

 textView.inputAccessoryView = customViewTV

在 customViewTV 中添加单独的 textView 作为 subview 并使用它

   func createCustomTV(text: String) {
        customViewTV = UIView(frame: CGRect(x: 0, y: 0, width: self.view.frame.width, height: 44))
        customViewTV.backgroundColor = UIColor.red
        let acceTextView = UITextView()
        acceTextView.text = text
        acceTextView.frame = CGRect(x: 0, y: 0, width: customViewTV.frame.width, height: customViewTV.frame.height)
        acceTextView.center = customViewTV.center
        acceTextView.textColor = .black
        customViewTV.addSubview(acceTextView)
    }

结果