UICollectionView Cell Tapped 时显示按钮

Question

我有一张图片，当用户在该图片上点击两次时，我会显示一个带有勾号的按钮，就好像用户已经勾选了该图片一样。我已将按钮设置为首先从情节提要中隐藏。

我正在使用这个进行手机窃听

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
if collectionView == self.subOptionsCollectionView{
        let imageNamed = "\(customizeOptionSelected[indexPath.row])"

        shirtImage.image = UIImage(named: imageNamed)

        let tap = UITapGestureRecognizer(target: self, action: #selector(doubleTapped))
        tap.numberOfTapsRequired = 2
        collectionView.addGestureRecognizer(tap)
    }
}
func doubleTapped() {
    print("Double Tap")
}

但是如何显示 tick/button？

Answer 1

将你的代码放在cellForRowAtIndexPath而不是didSelect中并禁用collectionView的userInteraction然后你可以在[=中将按钮的isHidden 属性设置为true 17=]，但你必须像这样改变函数（Swift3）：

func doubleTapped(selectedIndex: IndexPath) {
    print("Double Tap")
}

并像这样更改选择器：

UITapGestureRecognizer(target: self, action: self.doubleTapped(selectedIndex: indexPath))

还有一个解决方案：

将代码放在 cellForRowAtIndexPath 而不是 didSelect 然后你可以在 doubleTapped 中将按钮的 isHidden 属性设置为 true，但你必须更改像这样的功能（Swift2）：

func doubleTapped(sender: AnyObject) {
     let buttonPosition: CGPoint = sender.convertPoint(CGPointZero, toView: self.collectionView)
     let indexPath: NSIndexPath = self.collectionView.indexPathForRowAtPoint(buttonPosition)!
     //you have the selected cell index
     let cell = self.collectionView.cellForItemAtIndexPath(indexPath)
     //now you have the cell and have access to the button

}

并添加这样的手势：

let tapGesture = UITapGestureRecognizer(target: self, action: #selector(self.doubleTapped(_:)))
cell.addGestureRecognizer(tapGesture)

Answer 2

Swift 4更新：

  @IBAction func doubleTap(_ sender: UITapGestureRecognizer) {

        let buttonPosition: CGPoint = sender.location(in: self.collectionView)
        guard let indexPath = self.collectionView?.indexPathForItem(at: buttonPosition) else { return }

        print ("doubleTap on cell at: ", indexPath)

        let cell = self.collectionView.cellForItem(at: indexPath)
        // now you have the cell and have access to the button
    }

UICollectionView Cell Tapped 时显示按钮

Display button when UICollectionView Cell Tapped

ios

uicollectionview

uicollectionviewcell

swift

还有一个解决方案：