ios - menuController Action 的 tableView 设置编辑不起作用

Question

我有一个 tableView 和 tableViewCell。我创建 MenuController 来设置 TableView 编辑。但似乎失败了。但我使用导航按钮添加“testFunc”操作。它可以改变多选编辑。我想念什么？我已经添加了tableView的 subview 。我还关注 UITableViewDataSource、UITableViewDelegate。

protocol DelegateA {
func testFunc()
}

class ViewController: UIViewController,DelegateA { 

lazy var tableView:UITableView = { ()->UITableView in
    let ui:UITableView = UITableView()
    ui.delegate = self
    ui.dataSource = self
    ui.separatorStyle = .none
    ui.backgroundColor = defaultBackgroundColor
    return ui
}()

override func viewDidLoad() {
    super.viewDidLoad()

    self.tableView.allowsMultipleSelectionDuringEditing = true
}

func testFunc() {

    print("123") //it print "123" successful

    //not working
    if(self.tableView.isEditing == false) {
        self.tableView.setEditing(true, animated:true)
    }
    else {
        self.tableView.setEditing(false, animated:true)
    }
}

}

这是自定义的tableViewCell的标签

class UITalkContent:UILabel {

var delegate:DelegateA?

override init(frame: CGRect) {
    super.init(frame:frame)
    translatesAutoresizingMaskIntoConstraints = false
    numberOfLines = 0
    isUserInteractionEnabled = true
    addGestureRecognizer(UILongPressGestureRecognizer(target: self, action: #selector(gestureLongPress)))
}

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

override func drawText(in rect: CGRect) {
    let insets: UIEdgeInsets = UIEdgeInsets(top: defaultContentPadding, left: defaultPadding, bottom: defaultContentPadding, right: defaultPadding)
    super.drawText(in: UIEdgeInsetsInsetRect(rect, insets))
}

func gestureLongPress(sender:UILongPressGestureRecognizer) {

    if (sender.state == .ended) {
        return
    }

    becomeFirstResponder()


    let menu = UIMenuController.shared


    menu.menuItems = [
        UIMenuItem(title: localString(string: "FORWARD"), action: #selector(forward)),
    ]


    menu.setTargetRect(bounds, in: self)


    menu.setMenuVisible(true, animated: true)
}

func forward(menu :UIMenuController ) {
    print("321") //print "321" successfully 
    self.delegate = ViewController()
    self.delegate?.testFunc()

}

override var canBecomeFirstResponder: Bool{
    return true
}

override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
    if (action == #selector(UIResponderStandardEditActions.copy(_:)) || action == #selector(forward)) {
        return true
    }
    return false
}

override func copy(_ sender: Any?) {
    UIPasteboard.general.string = text
}
}

2017.06.16更新

class ContentTableViewCell: UITableViewCell {

var labelContent:UILabel = { ()->UILabel in
    let ui:UILabel = UITalkContent()
    ui.textColor = UIColor(red:0.20, green:0.20, blue:0.20, alpha:1.00)
    ui.backgroundColor = UIColor.white
    ui.font = defaultTextFont
    ui.numberOfLines = 0
    ui.lineBreakMode = NSLineBreakMode.byCharWrapping
    ui.layer.cornerRadius = defaultButtonRadius
    ui.layer.masksToBounds = true
    ui.isHidden = false
    return ui
}()

    override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
    super.init(style: style, reuseIdentifier: reuseIdentifier)
    loadContent()
}

required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)
}

override func layoutSubviews() {
    super.layoutSubviews()
    loadVFL()
}

func loadContent() {
    contentView.addSubview(labelContent)
}

func loadVFL() {
    labelContent.frame = CGRect(x: 0, y: 0, width: contentWidth, height: CGFloat.greatestFiniteMagnitude)
    labelContent.sizeToFit() 

}
}

Answer 1

你想知道的其实是不清楚和模糊的。但我可以在这里看到您正在以错误的方式进行协议(protocol)委托(delegate)。为了使此过程正确，请按照以下步骤操作:

1. 在您的发送者类中创建一个协议(protocol)，您希望从中传递任何消息(在您的情况下:UITalkContent)

   protocol MyProtocol {
       func testFunc()
   }
   class UITalkContent: UILabel {...}
   

2. 在发送者类中添加一个委托(delegate) var:

   class UITalkContent: UILabel {
       var delegate: MyProtocol?
       ...
       ...
   }
   

3. 使用此委托(delegate)var来调用您在协议(protocol)中指定的方法。这必须在您的发送者类中以及当您准备发送任何消息时完成。在您的情况下，它是 funcforward(menu:)

   class UITalkContent: UILabel {
       ...
       ...
       func forward(menu :UIMenuController ) {
           ...
           ...
           delegate.testFunc()
       }
       ...
       ...
   }
   

4. 在您的接收类中采用协议(protocol)(在您的情况下:ViewController)

   class ViewController: UIViewController, MyProtocol {
       ...
       ...
   }
   

5. 在接收类中实现协议(protocol)的方法。当通知发生时，程序控制将转移到这里。

   class ViewController: UIViewController, MyProtocol {
       ...
       ...
       func testFunc() {
           // do what you want to do when program control reaches here
       }
       ...
       ...
   }
   

6. 现在您必须将接收类设置为该发送方类的委托(delegate)。为此，您必须将 self(接收类)分配给发送者类的实例。 (但我没有看到您的 UILabel 的任何实例)

   class ViewController: UIViewController, MyProtocol {
       ...
       ...
       `instance of UILabel` = self
       ...
       ...
   }