Ios 如何在UICollectionView上绘制接触（UIBezierPath）？

好吧，我花了好几个小时搜索和尝试了一些东西，但结果是空的。希望你们都能帮忙

我需要用苹果铅笔（或手指）在UICollectionView上画画。想想绕着细胞旋转，画箭头之类的事情。我正在使用Apple的示例对一个UIView进行子类化以进行绘制，并且我已经能够将它设置为其他视图的子视图，以便能够毫无问题地在这些视图之上进行绘制。但是，当我使用UICollectionView执行此操作时，它不起作用。如果我将视图和CollectionView放在viewController中的同一个“级别”上，并将UICollectionView设置为hidden，它就会工作。如果UICollectionView可见，则仍会绘制线，但通过UICollectionView当然不可见。任何其他方式，都没有

我尝试过将UICollectionViewController子类化，以便自己想出一些东西，但似乎不知道如何使其工作。任何帮助都将不胜感激

谢谢

编辑：在下面添加更多详细信息

IB（在PieChartView上绘制）中的此设置工作正常：

我使用的代码如下（当然，删除了无关代码）：

。。。但事实并非如此。（请原谅这个图表，不能发布超过2个链接）

我尝试按如下方式子类化UICollectionViewController，但结果不一：

import UIKit

class CollectionViewCanvas: UICollectionViewController {

    // MARK: - VARIABLES

    var visualizeAzimuth = false

    var table:      Table!
    var detailView: DetailViewController!
    let reuseIdentifier = "cell" // also set as cell identifier in storyboard
    var textView:     UITextView!
    var clearButton:  UIButton!
    var workingData: [Double]! = []

    var canvasView = CanvasView()

    // MARK: - FUNCTIONS

    override func loadView() {
        super.loadView()

        self.collectionView?.addSubview(canvasView)
        canvasView.hidden = false
     collectionView?.hidden = true
    }

    // MARK: - UICollectionViewDataSource protocol

    // tell the collection view how many cells to make
    override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        //return self.items.count
        return self.table.COUNT
    }

    // make a cell for each cell index path
    override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
        // cell formatting here
    }

    // MARK: - UICollectionViewDelegate protocol

    override func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
        // doing stuff in here that sets up the cells
        collectionView.reloadItemsAtIndexPaths(indices)
    }

    // MARK: - UICOllectionViewDelegateFlowLayout

    func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAtIndex section: Int) -> CGFloat {
        return -0.5
    }

    func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAtIndex section: Int) -> CGFloat {
        return 0
    }

    func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
        let cellWidth = collectionView.frame.width / 5.0
        return CGSize(width: cellWidth, height: 50)
    }

    // MARK: - Touches for CanvasView

    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        canvasView.drawTouches(touches, withEvent: event)
    }

    override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
        canvasView.drawTouches(touches, withEvent: event)
    }

    override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
        canvasView.drawTouches(touches, withEvent: event)
        canvasView.endTouches(touches, cancel: false)
    }

    override func touchesCancelled(touches: Set<UITouch>?, withEvent event: UIEvent?) {
        guard let touches = touches else { return }
        canvasView.endTouches(touches, cancel: true)
    }

    override func touchesEstimatedPropertiesUpdated(touches: Set<NSObject>) {
        canvasView.updateEstimatedPropertiesForTouches(touches)
    }
}

导入UIKit
类CollectionViewCanvas:UICollectionViewController{
//标记：-变量
方位角=假
var表格：表格！
var-detailView:DetailViewController！
让reuseIdentifier=“cell”//也设置为故事板中的单元标识符
var textView:UITextView！
var clearButton:UIButton！
变量工作数据：[Double]！=[]
var canvasView=canvasView（）
//马克：-功能
重写func loadView（）{
super.loadView（）
self.collectionView？.addSubview（画布视图）
canvasView.hidden=false
collectionView？隐藏=真
}
//标记：-UICollectionViewDataSource协议
//告诉集合视图要生成多少个单元格
重写func collectionView（collectionView:UICollectionView，numberOfItemsInSection:Int）->Int{
//返回self.items.count
返回self.table.COUNT
}
//为每个单元格索引路径创建一个单元格
重写func collectionView（collectionView:UICollectionView，cellForItemAtIndexPath indexPath:NSIndexPath）->UICollectionViewCell{
//这里的单元格格式
}
//标记：-UICollectionViewDelegate协议
重写func collectionView（collectionView:UICollectionView，didSelectItemAtIndexPath indexPath:NSIndexPath）{
//在这里做一些事情来建立细胞
collectionView.ReloadItemsAndExpaths（索引）
}
//标记：-UICOllectionViewDelegateFlowLayout
func collectionView（collectionView:UICollectionView，布局collectionViewLayout:UICollectionViewLayout，MinimumItemSpacingForSectionAtIndex节：Int）->CGFloat{
回报率-0.5
}
func collectionView（collectionView:UICollectionView，布局collectionViewLayout:UICollectionViewLayout，minimumLineSpacingForSectionAtIndex节：Int）->CGFloat{
返回0
}
func collectionView（collectionView:UICollectionView，布局collectionViewLayout:UICollectionViewLayout，SizeFormiteIndeXPath indexPath:NSIndexPath）->CGSize{
设cellWidth=collectionView.frame.width/5.0
返回CGSize（宽度：cellWidth，高度：50）
}
//马克：-触摸画布视图
覆盖功能触摸开始（触摸：设置，withEvent事件：UIEvent？）{
canvasView.DrawTouchs（Touchs，withEvent:event）
}
覆盖功能触摸移动（触摸：设置，带事件：UIEvent？）{
canvasView.DrawTouchs（Touchs，withEvent:event）
}
覆盖func touchesEnded（触摸：设置，withEvent事件：UIEvent？）{
canvasView.DrawTouchs（Touchs，withEvent:event）
canvasView.EndTouchs（触摸，取消：false）
}
覆盖功能触摸已取消（触摸：设置？，带事件：UIEvent？）{
保护让接触=接触其他{return}
canvasView.EndTouchs（触摸，取消：true）
}
覆盖功能触摸估计属性更新（触摸：设置）{
canvasView.UpdateEstimatedProperties for touches（触摸）
}
}

在这种情况下，当collectionView设置为hidden时，我可以用铅笔触发TouchsBegind（）。如果collectionView可见，则触摸会直接转到didSelectItemAtIndexPath，仅此而已

---

希望这是有益的澄清

MichaelDotKnox更新道：“你能发布一些你已经尝试过的、有效的和无效的代码吗？”。如果您想了解更多信息，请告诉我！

V View
  V CollectionView
      CanvasView

import UIKit

class CollectionViewCanvas: UICollectionViewController {

    // MARK: - VARIABLES

    var visualizeAzimuth = false

    var table:      Table!
    var detailView: DetailViewController!
    let reuseIdentifier = "cell" // also set as cell identifier in storyboard
    var textView:     UITextView!
    var clearButton:  UIButton!
    var workingData: [Double]! = []

    var canvasView = CanvasView()

    // MARK: - FUNCTIONS

    override func loadView() {
        super.loadView()

        self.collectionView?.addSubview(canvasView)
        canvasView.hidden = false
     collectionView?.hidden = true
    }

    // MARK: - UICollectionViewDataSource protocol

    // tell the collection view how many cells to make
    override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        //return self.items.count
        return self.table.COUNT
    }

    // make a cell for each cell index path
    override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
        // cell formatting here
    }

    // MARK: - UICollectionViewDelegate protocol

    override func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
        // doing stuff in here that sets up the cells
        collectionView.reloadItemsAtIndexPaths(indices)
    }

    // MARK: - UICOllectionViewDelegateFlowLayout

    func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAtIndex section: Int) -> CGFloat {
        return -0.5
    }

    func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAtIndex section: Int) -> CGFloat {
        return 0
    }

    func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
        let cellWidth = collectionView.frame.width / 5.0
        return CGSize(width: cellWidth, height: 50)
    }

    // MARK: - Touches for CanvasView

    override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
        canvasView.drawTouches(touches, withEvent: event)
    }

    override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {
        canvasView.drawTouches(touches, withEvent: event)
    }

    override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
        canvasView.drawTouches(touches, withEvent: event)
        canvasView.endTouches(touches, cancel: false)
    }

    override func touchesCancelled(touches: Set<UITouch>?, withEvent event: UIEvent?) {
        guard let touches = touches else { return }
        canvasView.endTouches(touches, cancel: true)
    }

    override func touchesEstimatedPropertiesUpdated(touches: Set<NSObject>) {
        canvasView.updateEstimatedPropertiesForTouches(touches)
    }
}