Swift iOS-点击TextField、TextView和Background但丢失事件时删除视图

首先让我说，我玩编程，但我目前是一个新手

我混合了编程视图和故事板对象：

情节提要对象：

钮扣

文本字段

文本视图

程序视图：

消息标签

viewForMessageLabel

当我按下按钮时，添加了

viewForMessageLabel

。在

viewDidLoad

中，我添加了一个点击手势，以在点击背景时删除

viewForMessageLabel

。我还向文本字段添加了相同的点击手势，以删除

viewForMessageLabel

（如果存在）。我再次将相同的点击手势添加到文本字段以将其删除

如果键盘存在，我会在文本字段中添加另一个点击手势，将其关闭。我注意到事情很古怪，我与事件失去了联系

如果我在触摸背景时按下按钮添加标签，它不会被取消。如果我按下文本字段，它将关闭它并显示键盘。如果我再次按下按钮，文本字段仍处于打开状态，则会出现标签，我再次按下文本字段，但什么也没有发生。当我按return键隐藏键盘（我实现了该方法）时，键盘消失，按下按钮，出现

viewForMessageLabel

，现在当我按文本字段时

viewForMessageLabel

消失。基本上，textField也发生了同样的事情

我想要的是

如果出现了

viewForMessageLabel

，并且我按下了背景、文本字段或文本视图，它应该会消失

如果textField或textView的键盘存在，并且我按下背景，键盘也应该消失

我的代码：

class ViewController: UIViewController, UITextFieldDelegate, UITextViewDelegate {

    //MARK:- Outlets
    @IBOutlet weak var textField: UITextField!
    @IBOutlet weak var textView: UITextView!
    @IBOutlet weak var button: UIButton!

    let messagelabel: UILabel = {
        let label = UILabel()
        label.translatesAutoresizingMaskIntoConstraints = false
        label.text = "Pizza Pizza Pizza Pizza Pizza"
        label.font = UIFont(name: "Helvetica-Regular", size: 17)
        label.sizeToFit()
        label.numberOfLines = 0
        label.textAlignment = .center
        label.textColor = UIColor.white
        label.backgroundColor = UIColor.clear
        return label
    }()

    let viewForMessageLabel: UIView = {
        let view = UIView()
        view.translatesAutoresizingMaskIntoConstraints = false
        view.backgroundColor = UIColor.red
        return view
    }()

    //View Controller Lifecycle
    override func viewDidLoad() {
        super.viewDidLoad()

        textField.delegate = self
        textView.delegate = self

        // 0. hide viewForMessageLabel is background is tapped
        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(removeViewForMessageLabel))
        view.addGestureRecognizer(tapGesture)

        // 1. hide viewForMessageLabel if textView is tapped
        textView.addGestureRecognizer(tapGesture)

        // 2. hide keyboard if background if tapped
        let hideKeyboard = UITapGestureRecognizer(target: self, action: #selector(hideKeyboardWhenBackGroundTapped))
        view.addGestureRecognizer(hideKeyboard)

        // 3. hide keyboard if textView is tapped
        textView.addGestureRecognizer(hideKeyboard)

        // 4. hide viewForMessageLabel for textField if background is tapped
        textField.addTarget(self, action: #selector(removeViewForMessageLabel), for: .editingDidBegin)

    }

    //MARK:- Button
    @IBAction func buttonPressed(_ sender: UIButton) {
        view.addSubview(viewForMessageLabel)
        setViewForMessageLabelAnchors()
        setMessageLabelAnchors()
    }

    //MARK:- Functions
    func setViewForMessageLabelAnchors(){
        viewForMessageLabel.topAnchor.constraint(equalTo: view.topAnchor, constant: 44).isActive = true
        viewForMessageLabel.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 0).isActive = true
        viewForMessageLabel.rightAnchor.constraint(equalTo: view.rightAnchor, constant: 0).isActive = true
        viewForMessageLabel.addSubview(messagelabel)
    }

    func setMessageLabelAnchors(){
        messagelabel.topAnchor.constraint(equalTo: viewForMessageLabel.topAnchor, constant: 0).isActive = true
        messagelabel.widthAnchor.constraint(equalTo: viewForMessageLabel.widthAnchor).isActive = true
        viewForMessageLabel.bottomAnchor.constraint(equalTo: messagelabel.bottomAnchor, constant: 0).isActive = true
    }

    func removeViewForMessageLabel(){
        viewForMessageLabel.removeFromSuperview()
    }

    func hideKeyboardWhenBackGroundTapped(){
        textField.resignFirstResponder()
    }

    //MARK:- TextField Delegate
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        view.endEditing(true)
        return true
    }

    func textViewDidBeginEditing(_ textView: UITextView) {
        removeViewForMessageLabel()
    }

    //MARK:- TextView Delegate
    func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
        if(text == "\n") {
            textView.resignFirstResponder()
            return false
        }
        return true
    }
}

如果textField或textView的键盘存在，并且我按下背景，键盘也应该消失

您将其表示为取决于当前是否显示键盘，但您的代码没有反映这一点（而且不应该反映这一点）。您可以随时调用

resignFirstResponder

，这样就不会有什么不好的事情发生。您还可以对已删除的视图调用

removeFromSuperview

（请参阅）

因此，我认为您只需将一个动作附加到一个点击手势识别器：

var tapGesture: UITapGestureRecognizer?

override func viewDidLoad() {
    super.viewDidLoad()

    textField.delegate = self
    textView.delegate = self

    // 0. hide viewForMessageLabel is background is tapped
    tapGesture = UITapGestureRecognizer(target: self, action: #selector(removeLabelAndHideKeyboard))
    view.addGestureRecognizer(tapGesture)

    // 1. hide viewForMessageLabel if textView is tapped
    textView.addGestureRecognizer(tapGesture)
}

func removeLabelAndHideKeyboard() {
    viewForMessageLabel.removeFromSuperview()
    textField.resignFirstResponder()
}

如果textField或textView的键盘存在，并且我按下背景，键盘也应该消失

您将其表示为取决于当前是否显示键盘，但您的代码没有反映这一点（而且不应该反映这一点）。您可以随时调用

resignFirstResponder

，这样就不会有什么不好的事情发生。您还可以对已删除的视图调用

removeFromSuperview

（请参阅）

因此，我认为您只需将一个动作附加到一个点击手势识别器：

var tapGesture: UITapGestureRecognizer?

override func viewDidLoad() {
    super.viewDidLoad()

    textField.delegate = self
    textView.delegate = self

    // 0. hide viewForMessageLabel is background is tapped
    tapGesture = UITapGestureRecognizer(target: self, action: #selector(removeLabelAndHideKeyboard))
    view.addGestureRecognizer(tapGesture)

    // 1. hide viewForMessageLabel if textView is tapped
    textView.addGestureRecognizer(tapGesture)
}

func removeLabelAndHideKeyboard() {
    viewForMessageLabel.removeFromSuperview()
    textField.resignFirstResponder()
}

---

这并不能完全回答问题，但我找到了一个解决办法。如果我使用@Toddg建议的方法：

func removeLabelAndHideKeyboard() {
    viewForMessageLabel.removeFromSuperview()
    textField.resignFirstResponder()
}

它在函数中添加了重新调整文本字段的功能，这非常有帮助

在viewDidLoad中，我还添加了：

textField.addTarget(self, action: #selector(removeViewForMessageLabel), for: .touchDown)

这里的关键是使用.touchtdown而不是.editingdidbeagin。这样我就可以在textField和textView之间来回切换，键盘将对这两个字段做出响应。我必须再添加一件事——在textView的键盘上添加一个工具栏，该工具栏上的“完成”按钮可以关闭textView：

    func addDoneButtonOnKeyboard(){
        let toolBar = UIToolbar()
        toolBar.sizeToFit()
        doneButton = UIBarButtonItem(barButtonSystemItem: .done, target: self, action: #selector(dismissKeyboard))
        toolBar.setItems([doneButton!], animated: true)
        textView.inputAccessoryView = toolBar
    }

    @objc func dismissTextViewKeyboard(){
        view.endEditing(true)
    }

这样，当文本视图出现时，我可以将其忽略

在所有情况下，如果我按textField、background或textView，并且ViewFormMessageLabel出现，它将消失

如果文本字段是第一响应者，并且它的键盘存在，并且我按下背景，它将消失

我还不知道如何在触摸背景和其他东西时关闭textView，所以我在工具栏上实现了一个“完成”按钮。如果我按下它，并且textView的键盘存在，当它调用我添加的

dismissTextViewKeyboard（）

函数时，它将被解除。两者都在底部，其他所有内容都在viewDidLoad中

如果有人有更好的答案，我会投赞成票

class ViewController: UIViewController, UITextFieldDelegate, UITextViewDelegate {


    //MARK:- Outlets
    @IBOutlet weak var textField: UITextField!
    @IBOutlet weak var textView: UITextView!
    @IBOutlet weak var button: UIButton!

    let messagelabel: UILabel = {
        let label = UILabel()
        label.translatesAutoresizingMaskIntoConstraints = false
        label.text = "Pizza Pizza Pizza Pizza Pizza"
        label.font = UIFont(name: "Helvetica-Regular", size: 17)
        label.sizeToFit()
        label.numberOfLines = 0
        label.textAlignment = .center
        label.textColor = UIColor.white
        label.backgroundColor = UIColor.clear
        return label
    }()

    let viewForMessageLabel: UIView = {
        let view = UIView()
        view.translatesAutoresizingMaskIntoConstraints = false
        view.backgroundColor = UIColor.red
        return view
    }()

    fileprivate var doneButton: UIBarButtonItem?

    //View Controller Lifecycle
    override func viewDidLoad() {
        super.viewDidLoad()

        textField.delegate = self
        textView.delegate = self

        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(removeViewForMessageLabel))
        view.addGestureRecognizer(tapGesture)

        textField.addTarget(self, action: #selector(removeViewForMessageLabel), for: .touchDown)

        addDoneButtonOnKeyboard()
    }

    //MARK:- Button
    @IBAction func buttonPressed(_ sender: UIButton) {
        //removeMessage()
        view.addSubview(viewForMessageLabel)
        setBackgroundAnchors()
        setMessageAndLabelAnchors()
    }

    //MARK:- Functions
    func setBackgroundAnchors(){
        viewForMessageLabel.topAnchor.constraint(equalTo: view.topAnchor, constant: 44).isActive = true
        viewForMessageLabel.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 0).isActive = true
        viewForMessageLabel.rightAnchor.constraint(equalTo: view.rightAnchor, constant: 0).isActive = true
        viewForMessageLabel.addSubview(messagelabel)
    }

    func setMessageAndLabelAnchors(){

        messagelabel.topAnchor.constraint(equalTo: viewForMessageLabel.topAnchor, constant: 0).isActive = true
        messagelabel.widthAnchor.constraint(equalTo: viewForMessageLabel.widthAnchor).isActive = true
        viewForMessageLabel.bottomAnchor.constraint(equalTo: messagelabel.bottomAnchor, constant: 0).isActive = true
    }

    func removeViewForMessageLabel(){
        viewForMessageLabel.removeFromSuperview()
        textField.resignFirstResponder()
    }

    //MARK:- TextField Delegate
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        view.endEditing(true)
        return true
    }

    func textViewDidBeginEditing(_ textView: UITextView) {
        removeViewForMessageLabel()
    }

    //MARK:- TextView Delegate
    func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
        if(text == "\n") {
            textView.resignFirstResponder()
            return false
        }
        return true
    }

    //MARK:- Additional Functions
    //add a done button to the keyboard when the textView is first responder
    fileprivate func addDoneButtonOnKeyboard(){
        let toolBar = UIToolbar()
        toolBar.sizeToFit()
        doneButton = UIBarButtonItem(barButtonSystemItem: .done, target: self, action: #selector(dismissTextViewKeyboard))
        toolBar.setItems([doneButton!], animated: true)
        textView.inputAccessoryView = toolBar
    }

    //dismiss the keyboard when the Done button is tapped
    @objc func dismissTextViewKeyboard(){
        view.endEditing(true)
    }
}

---

这并不能完全回答问题，但我找到了一个解决办法。如果我使用@Toddg建议的方法：

func removeLabelAndHideKeyboard() {
    viewForMessageLabel.removeFromSuperview()
    textField.resignFirstResponder()
}

它在函数中添加了重新调整文本字段的功能，这非常有帮助

在viewDidLoad中，我还添加了：

textField.addTarget(self, action: #selector(removeViewForMessageLabel), for: .touchDown)

这里的关键是使用.touchtdown而不是.editingdidbeagin。这样我就可以在textField和textView之间来回切换，键盘将对这两个字段做出响应。我必须再添加一件事——在textView的键盘上添加一个工具栏，该工具栏上的“完成”按钮可以关闭textView：

    func addDoneButtonOnKeyboard(){
        let toolBar = UIToolbar()
        toolBar.sizeToFit()
        doneButton = UIBarButtonItem(barButtonSystemItem: .done, target: self, action: #selector(dismissKeyboard))
        toolBar.setItems([doneButton!], animated: true)
        textView.inputAccessoryView = toolBar
    }

    @objc func dismissTextViewKeyboard(){
        view.endEditing(true)
    }

这样，当文本视图出现时，我可以将其忽略

在所有情况下，如果我按textField、background或textView，并且ViewFormMessageLabel出现，它将消失

如果文本字段是第一响应者，并且它的键盘存在，并且我按下背景，它将消失

我还不知道如何在触摸背景和其他东西时关闭textView，所以我在工具栏上实现了一个“完成”按钮。如果我按下它，并且textView的键盘存在，当它调用我添加的

dismissTextViewKeyboard（）

函数时，它将被解除。两者都在底部，其他所有内容都在viewDidLoad中

如果有人有更好的答案，我会投赞成票

class ViewController: UIViewController, UITextFieldDelegate, UITextViewDelegate {


    //MARK:- Outlets
    @IBOutlet weak var textField: UITextField!
    @IBOutlet weak var textView: UITextView!
    @IBOutlet weak var button: UIButton!

    let messagelabel: UILabel = {
        let label = UILabel()
        label.translatesAutoresizingMaskIntoConstraints = false
        label.text = "Pizza Pizza Pizza Pizza Pizza"
        label.font = UIFont(name: "Helvetica-Regular", size: 17)
        label.sizeToFit()
        label.numberOfLines = 0
        label.textAlignment = .center
        label.textColor = UIColor.white
        label.backgroundColor = UIColor.clear
        return label
    }()

    let viewForMessageLabel: UIView = {
        let view = UIView()
        view.translatesAutoresizingMaskIntoConstraints = false
        view.backgroundColor = UIColor.red
        return view
    }()

    fileprivate var doneButton: UIBarButtonItem?

    //View Controller Lifecycle
    override func viewDidLoad() {
        super.viewDidLoad()

        textField.delegate = self
        textView.delegate = self

        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(removeViewForMessageLabel))
        view.addGestureRecognizer(tapGesture)

        textField.addTarget(self, action: #selector(removeViewForMessageLabel), for: .touchDown)

        addDoneButtonOnKeyboard()
    }

    //MARK:- Button
    @IBAction func buttonPressed(_ sender: UIButton) {
        //removeMessage()
        view.addSubview(viewForMessageLabel)
        setBackgroundAnchors()
        setMessageAndLabelAnchors()
    }

    //MARK:- Functions
    func setBackgroundAnchors(){
        viewForMessageLabel.topAnchor.constraint(equalTo: view.topAnchor, constant: 44).isActive = true
        viewForMessageLabel.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 0).isActive = true
        viewForMessageLabel.rightAnchor.constraint(equalTo: view.rightAnchor, constant: 0).isActive = true
        viewForMessageLabel.addSubview(messagelabel)
    }

    func setMessageAndLabelAnchors(){

        messagelabel.topAnchor.constraint(equalTo: viewForMessageLabel.topAnchor, constant: 0).isActive = true
        messagelabel.widthAnchor.constraint(equalTo: viewForMessageLabel.widthAnchor).isActive = true
        viewForMessageLabel.bottomAnchor.constraint(equalTo: messagelabel.bottomAnchor, constant: 0).isActive = true
    }

    func removeViewForMessageLabel(){
        viewForMessageLabel.removeFromSuperview()
        textField.resignFirstResponder()
    }

    //MARK:- TextField Delegate
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        view.endEditing(true)
        return true
    }

    func textViewDidBeginEditing(_ textView: UITextView) {
        removeViewForMessageLabel()
    }

    //MARK:- TextView Delegate
    func textView(_ textView: UITextView, shouldChangeTextIn range: NSRange, replacementText text: String) -> Bool {
        if(text == "\n") {
            textView.resignFirstResponder()
            return false
        }
        return true
    }

    //MARK:- Additional Functions
    //add a done button to the keyboard when the textView is first responder
    fileprivate func addDoneButtonOnKeyboard(){
        let toolBar = UIToolbar()
        toolBar.sizeToFit()
        doneButton = UIBarButtonItem(barButtonSystemItem: .done, target: self, action: #selector(dismissTextViewKeyboard))
        toolBar.setItems([doneButton!], animated: true)
        textView.inputAccessoryView = toolBar
    }

    //dismiss the keyboard when the Done button is tapped
    @objc func dismissTextViewKeyboard(){
        view.endEditing(true)
    }
}

---

你有很多重叠的轻拍手势识别器。我不确定水龙头是否默认通过。“看来你把这件事搞得太复杂了。”托德，谢谢。我刚刚读到一篇帖子，上面说我可以在同一个点击中添加另一个动作。我要试试看。你为什么说我把事情复杂化了？你有很多重叠的轻拍动作记录