小编Edw*_*onn的帖子

我正在尝试在我的 collectionViewCell 中实现 UISwipeGestureRecognizer，因此当您向左滑动时，单元格会消失。我想要实现的（我找不到方法）是为滑动设置动画，因此当我向左滑动单元格时，它会以淡入淡出效果消失。这是我在方法内的代码cellForItemAtindexPath

let cSelector = #selector(reset(sender:))
    let UpSwipe = UISwipeGestureRecognizer(target: self, action: cSelector)
    UpSwipe.direction = UISwipeGestureRecognizerDirection.left
    cell.addGestureRecognizer(UpSwipe)

方法

 func reset(sender: UISwipeGestureRecognizer) {

    let cell = sender.view as! UICollectionViewCell
    let i = self.collectionView?.indexPath(for: cell)!.item


    self.messages.remove(at: i!)
    self.collectionView?.reloadData()

}

谢谢！！！

编辑： 我想我找到了最简单的方法，但我遇到了一些麻烦。我尝试在单元格中实现 UIPanGestureRecognizer。这就是它的样子......

项目单元格

let gestureRecognizer = UIPanGestureRecognizer(target: self, action: #selector(handlePan(gestureRecognizer:)))
    cell.addGestureRecognizer(gestureRecognizer)

方法

func handlePan(gestureRecognizer: UIPanGestureRecognizer) {
    if gestureRecognizer.state == .began {
        // When the drag is first recognized, you can get the starting coordinates here

    }

    if gestureRecognizer.state …

我正在尝试编写一些代码,但是我在标题中得到了错误......这里是代码......

let text: NSString = messages[indexPath.row] as! NSString
var size: CGSize = text.boundingRectWithSize(CGSizeMake(240.0, 480.0), options: NSStringDrawingOptions.UsesDeviceMetrics, attributes: [NSFontAttributeName: UIFont.systemFontOfSize(14.0)], context: nil)

我在第二行收到错误

另外,我有Objective-C代码,没问题......但是我想在Swift中使用它

NSString *text = [messages objectAtIndex:indexPath.row];
CGSize size = [text sizeWithFont:[UIFont systemFontOfSize:14.0] constrainedToSize:CGSizeMake(240.0f, 480.0f) lineBreakMode:UILineBreakModeWordWrap];

提前致谢!!!