將 UILongPressGesture 添加到單元格而不是 CollectionView

Question

我正在嘗試將UILongGestureRecognizer添加到我的自定義 CollectionView 單元中，但處理程序 function從未調用過。 這是來自自定義單元格的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
    }
}

另外，這是我的cell configure function：

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視圖是單元格頂部的透明視圖。

Answer 1

我過去嘗試過這個並且遇到了問題，我相信與實際 collectionView 上的 contextMenu 交互有關。

您可以通過將手勢處理程序放在 collectionView 本身上並獲取手勢位置來修復它，然后按照此鏈接將單元格放在位置；

如何制作表格viewcell-handle-tap-and-longpress

Answer 2

如果您正在尋找最佳解決方案，我認為有更好的解決方案，例如將UILongPressGestureRecognizer添加到集合視圖並確定點擊了哪個單元格，或者您是否需要在長按func collectionView(_ collectionView: UICollectionView, contextMenuConfigurationForItemAt indexPath和推薦它們的原因是因為集合視圖上已經有一些手勢管理。

但是，如果您已經考慮了所有這些並且仍然覺得您的解決方案適合您，我認為問題在於這一行let longPress = UILongPressGestureRecognizer(target: self, action: #selector(handleLongPress(_:)))默認情況下，這似乎與單元格一起初始化。

我覺得也許當單元被重用時，在func configure中沒有正確配置某些東西

我會做這些改變：

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)
}

試試看，現在是否正在調用 function handleLongPress ？ 就我而言，這是可行的。

Answer 3

僅在 viewDidLoad() 中調用 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
    }
}