将 UILongPressGesture 添加到 Cell 而不是 CollectionView

Question

我正在尝试将 UILongGestureRecognizer 添加到我的 Custom CollectionView Cell 但 处理函数 从来没有叫。这是我来自自定义单元格的 gesture 和 handlerFunc：

let longPress = UILongPressGestureRecognizer(target: self, action: #selector(handleLongPress(_:)))

@objc func handleLongPress(_ recognizer: UILongPressGestureRecognizer) {
    switch recognizer.state {
    case .possible:
        break
    case .began:
        print("began")
        break
    case .changed:
        break
    case .ended:
        print("ended")
        break
    case .cancelled:
        break
    case .failed:
        break
    @unknown default:
        break
    }
}

此外，这是我的 cell configure 功能：

func configure(with viewModel: RecordsCollectionViewCellViewModel, itemCount: Int) {
    longPress.numberOfTapsRequired = 1
    longPress.minimumPressDuration = 0.3
    longPress.delaysTouchesBegan = true
    longPress.delegate = self
    
    self.bringSubviewToFront(gestureView)
    gestureView.isUserInteractionEnabled = true
    gestureView.addGestureRecognizer(longPress)

}

gestureView是单元格顶部的透明视图。

Answer 1

我过去尝试过这个但遇到了问题，我相信与实际 collectionView 上的 contextMenu 交互有关。

您可以通过将手势处理程序放在 collectionView 本身上并获取手势位置来修复它，然后根据此 link;

定位单元格

Answer 2

如果您正在寻找最佳解决方案，我认为有更好的解决方案，例如将 UILongPressGestureRecognizer 添加到集合视图并确定哪个单元格被点击，或者您是否需要在 long 上显示一些选项点击 func collectionView(_ collectionView: UICollectionView, contextMenuConfigurationForItemAt indexPath 并说明推荐它们的原因，因为集合视图上已经有一些手势管理。

但是，如果您已经考虑了所有这些并且仍然觉得您的解决方案适合您，我认为问题出在这一行 let longPress = UILongPressGestureRecognizer(target: self, action: #selector(handleLongPress(_:))) 上，它似乎与单元格一起默认初始化.

我觉得也许当单元格被重用时，func configure

中的某些内容配置不正确

我会做这些改变：

func configure(with viewModel: RecordsCollectionViewCellViewModel, itemCount: Int) {

        // Remove any previous gesture recognizers, maybe this is not needed 
        gestureView.gestureRecognizers?.removeAll()

        // Initialize a new gesture recognizer
        let longPress = UILongPressGestureRecognizer(target: self,
                                                     action: #selector(handleLongPress))
        
        // longPress.numberOfTapsRequired = 1 - not needed
        
        longPress.minimumPressDuration = 0.3
        
        // longPress.delaysTouchesBegan = true - not needed
        
        // longPress.delegate = self - not needed unless you are doing something else
        
        gestureView.isUserInteractionEnabled = true
        
        gestureView.addGestureRecognizer(longPress)
}

试一试，看看你的函数 handleLongPress 是否被调用了？就我而言，这是可行的。

Answer 3

只在viewDidLoad()中调用setLongPress()

func setLongPress(){
     let lpgr = UILongPressGestureRecognizer(target: self, action: #selector(handleLongPress(_:)))
     lpgr.minimumPressDuration = 0.5
     lpgr.delaysTouchesBegan = true
     lpgr.delegate = self
     self.CollectionView.addGestureRecognizer(lpgr)
}

@objc func handleLongPress(_ gestureRecognizer: UILongPressGestureRecognizer?) {
    if gestureRecognizer?.state != .ended {
        return
    }
    let p = gestureRecognizer?.location(in: projectCollectionView)

    let indexPath = CollectionView.indexPathForItem(at: p ?? CGPoint.zero)
    if indexPath == nil {
        print("couldn't find index path")
    } else {
        // get the cell at indexPath (the one you long pressed)
        var cell: UICollectionViewCell? = nil
        if let indexPath = indexPath {
            // your action here
        }
        // do stuff with the cell
    }
}

将 UILongPressGesture 添加到 Cell 而不是 CollectionView

Adding UILongPressGesture to Cell not CollectionView

cell

gesture

uicollectionview

swift

uilongpressgesturerecogni