Peek/Pop 预览忽略集合视图中的单元格角半径

Question

我在我的集​​合视图单元格中添加了 3D Touch Peek/Pop 功能，效果很好，但是我注意到预览框架不考虑单元格的角半径。

这是我的预览功能：

func previewingContext(previewingContext: UIViewControllerPreviewing, viewControllerForLocation location: CGPoint) -> UIViewController? {
    let viewController = storyboard?.instantiateViewControllerWithIdentifier("scholarDetailViewController") as? ScholarDetailViewController
    let cellPosition = self.scholarsCollectionView.convertPoint(location, fromView: self.view)
    let cellIndex = self.scholarsCollectionView.indexPathForItemAtPoint(cellPosition)

    guard let previewViewController = viewController, indexPath = cellIndex, cell = self.scholarsCollectionView.cellForItemAtIndexPath(indexPath) else {
        return nil
    }

    let scholar = self.searchBarActive ? self.searchResults[indexPath.item] as! Scholar : self.currentScholars[indexPath.item]
    previewViewController.setScholar(scholar.id)
    previewViewController.delegate = self
    previewViewController.preferredContentSize = CGSize.zero
    previewingContext.sourceRect = self.view.convertRect(cell.frame, fromView: self.scholarsCollectionView)

    return previewViewController
}

我已尝试设置 previewingContext sourceView 的圆角半径并在单元格上使用 maskToBounds，但到目前为止我尝试过的没有任何帮助。

这是单元格设置：

override func awakeFromNib() {
    self.layer.cornerRadius = 7
}

有人有什么建议吗？

Answer 1

据我了解，您希望获得类似第一的东西，而不是第二：

问题是您在整个视图上注册通知。像这样的东西： registerForPreviewingWithDelegate(self, sourceView: self.view)，这就是为什么你的触摸区域对细胞层一无所知。

你应该做的——亲自注册每个单元：

func collectionView(collectionView: UICollectionView, willDisplayCell cell: UICollectionViewCell, forItemAtIndexPath indexPath: NSIndexPath) {

    let previwingController = registerForPreviewingWithDelegate(self, sourceView: cell)
    previwingControllers[cell] = previwingController
}

func collectionView(collectionView: UICollectionView, didEndDisplayingCell cell: UICollectionViewCell, forItemAtIndexPath indexPath: NSIndexPath) {

    if let previwingController = previwingControllers[cell] {
      unregisterForPreviewingWithContext(previwingController)
    }
}

只需将previewingContext.sourceRect = self.view.convertRect(cell.frame, fromView: self.scholarsCollectionView) 更改为previewingContext.sourceRect = cell.bounds

附：当然不要忘记在你的视图中删除registerForPreviewingWithDelegate :)