ios - 如果涉及 super View ，则不排除带有 subview 的 UIScrollView

Question

所以我正在尝试创建一个界面，其中基本上有 3 个可能的 View 级别。

1. UIView 负责决定新单元格的元数据
2. 细胞本身
3. 后台UIScrollView

一切都是 UIScrollView 的子元素，但是 1 显示在 2 之上。

目标是所有单元格都是可拖动的， ScrollView 是可滚动的。然而，当点击 ScrollView 时，应该会触发新节点的创建，因此 View 1 的外观将在按下提交按钮时消失。

除了我有一个大问题之外，我已经设置了几乎所有的东西。如果我点击一个单元格，我仍然会得到创建 View ，这意味着 TapGestureRecognizer 不排除 subview 。所以这里大致设置了什么:

class Node: UILabel {

    var recognizer:UIPanGestureRecognizer?
    init() {
        self.isExclusiveTouch = true
        self.isUserInteractionEnabled = true

        recognizer = UIPanGestureRecognizer(target: self, action: #selector(drag))
        self.addGestureRecognizer(recognizer!)
    }

    @objc
    func drag(rec: UIPanGestureRecognizer) {
        goToPoint(point: rec.location(in: self.superview!))
    }

    public func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
        var shouldReceive = false
        if let clickedView = touch.view {
            if clickedView == self {
                shouldReceive = true;
            }
        }
        return shouldReceive
    }
}

class NodeCreator: UIView {

    var submit: UIButton = UIButton(type: UIButton.ButtonType.roundedRect)

    init() {
        super.init(frame: CGRect.zero)

        submit.setTitle("Submit", for: .normal)
        submit.translatesAutoresizingMaskIntoConstraints = false
        submit.addTarget(self, action: #selector(press), for: .touchUpInside)
        self.addSubview(submit)
    }

    @objc func press() {
        if let d = delegate {
            if let t = inputField.text {
                d.created(title: t, pt: storeP)
                self.removeFromSuperview()
            }
        }
    }
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
}
class TaskView: UIScrollView, CreationDelecate{

    func created(title: String, pt: CGPoint) {
        let temp = Node()
        view.addNode(temp, at: pt)
    }

    var tapRecognizer:UITapGestureRecognizer?

    var nodeSet:[Node] = []
    func addNode(_ n1: Node, at: CGPoint = CGPoint.zero) {
        nodeSet.append(n1)
        n1.goToPoint(point: at)
        self.addSubview(n1)
        self.bringSubviewToFront(n1)

        self.isScrollEnabled = true
        self.isUserInteractionEnabled = true
        self.isExclusiveTouch = false

        self.canCancelContentTouches = false

        if (tapRecognizer == nil) {
            tapRecognizer = UITapGestureRecognizer(target: self, action: #selector(tap))
            self.addGestureRecognizer(tapRecognizer!)
        }
    }

    @objc func tap(rec: UITapGestureRecognizer) {
        let pos = rec.location(in: self)
        let creator = NodeCreator(pt: pos)
        creator.delegate = self
        self.addSubview(creator)
    }

    public func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
        var shouldReceive = false
        if let clickedView = touch.view {
            if clickedView == self {
                shouldReceive = true;
            }
        }
        return shouldReceive
    }
}

为什么Nodes都是独占触摸时，TaskView仍然接收到点击手势。

Answer 1

代码不起作用，因为您没有为手势识别器分配委托(delegate)。委托(delegate)函数在 Node 和 TaskView 类中实现。但是您没有将类声明为委托(delegate)，即

class TaskView: UIScrollView, CreationDelecate, UIGestureRecognizerDelegate

将委托(delegate)分配给手势识别器:

recognizer.delegate = self as! UIGestureRecognizerDelegate

应该可以