如果涉及超级视图，则不会排除带有子视图的 UIScrollView

Question

所以我正在尝试创建一个界面，其中基本上可能有 3 个级别的视图。

1. 负责决定新细胞元数据的UIView。
2. 细胞本身
3. 后台 UIScrollView

一切都是UIScrollView的子项，但是1显示在2之上。

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

我已经设置了几乎所有东西，除了我有一个大问题。如果我点击一个单元格，我仍然会得到创建视图，这意味着 TapGestureRecognizer 不会排除子视图。所以这里大致是设置的内容：

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
}
}

为什么当节点都是独占触摸时，任务视图仍然接收点击手势。

Answer 1

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

class TaskView: UIScrollView, CreationDelecate, UIGestureRecognizerDelegate

将委托分配给手势识别器：

recognizer.delegate = self as! UIGestureRecognizerDelegate

应该工作