ios - UICollectionView Cell Tapped 时显示按钮

Question

我有一个图像，当用户在该图像上点击两次时，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像一样。我已将按钮设置为首先从 Storyboard 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")
}

但是我该如何显示那个勾号/按钮呢？

Answer 1

将您的代码放在 cellForRowAtIndexPath 而不是 didSelect 并禁用 collectionView 的 userInteraction 然后您可以将按钮的 isHidden 属性设置为 true在 doubleTapped 中，但您必须像这样更改函数 (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:

将您的代码放在 cellForRowAtIndexPath 而不是 didSelect 中，然后您可以在 doubleTapped 中将按钮的 isHidden 属性设置为 true，但是您有像这样改变函数(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

}

然后像这样添加手势:

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