Question

我有一个UICollectionView，其中包含从我的AssignmentManager类填充的单元格。当用户想要删除作业时，他们按住一个单元格以便删除按钮以显示在他们单击的单元格上。使用下面的代码，当用户单击一个单元格时，每个单元格上都会显示删除按钮。如何使用UIGestureRecognizer解决此问题？如何指定用户在我的代码中按下并保留的单个单元格？任何帮助将不胜感激。

*有些注意事项：我只包含了我认为与问题相关的代码。如果需要，我可以添加更多。也是的，我把missButton拼错为delteButton。如果这让任何人感到困惑，我很抱歉。

    var userWantsToRemoveDeleteButton: Bool = false
    var userDelete: Bool = false

        func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
               let cell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as! homeworkcell
               cell.delteButton.hidden = true
               cell.delteButton.enabled = false
                    if userDelete == true {
                        cell.delteButton.hidden = false
                        cell.delteButton.enabled = true
                        if userWantsToRemoveDeleteButton == true {
                            cell.delteButton.hidden = true
                            cell.delteButton.enabled = false
                        }
                    }
                    // add button gestures
                    cell.delteButton?.layer.setValue(indexPath.item, forKey: "index")
                    cell.delteButton?.addTarget(self, action: "deleteAssignment:", forControlEvents: UIControlEvents.TouchUpInside)

                    // add the swipe gestures
                    let longPress = UILongPressGestureRecognizer(target: self, action: "deleteMode:")
                    cell.addGestureRecognizer(longPress)

                    let assignments = AssignmentManager.assignments[indexPath.item]
                    cell.myLabel.text = assignments.title
                    cell.assignment = assignments
                    cell.dueLabel.text = dateString
                    cell.myLabel.textColor = UIColor.whiteColor()
                    cell.backgroundColor = UIColor.blueColor()
                    cell.layer.borderColor = UIColor.blackColor().CGColor
                    cell.layer.borderWidth = 1
                    cell.layer.cornerRadius = 8

                    return cell
            }

    func deleteMode(sender: UISwipeGestureRecognizer) {
            userDelete = true
            userWantsToRemoveDeleteButton = false
            collectionView.reloadData()

            doneEditingButton.enabled = true
    }

    func deleteAssignment(sender: UIButton) {
        let i : Int = (sender.layer.valueForKey("index")) as! Int
        AssignmentManager.deleteAssignment(i)

        NSUserDefaultsManager.synchronize()

        collectionView.reloadData()
    }

Answer 1

嗯，这种情况正在发生，因为userDelete变为true，然后按钮显示在每个单元格中。您应该记住按下哪个单元格用户。所以也许可以在单元格中添加标签（indexPath.row），然后在deleteMode函数中调用reload方法。然后在cellForRow方法中检查selectedTag是否等于indexPath.row并显示按钮（如果是），否则隐藏它。这只是一个快速的例子，你可以做到这一点......

Swift：Make UIGestureRecognizer只影响一个UICollectionViewCell，而不是全部

1 个答案: