Peek/Pop预览忽略集合视图中的单元格角半径

Question

我已将3D Touch Peek/Pop功能添加到我的集合视图单元格中并且效果很好,但是我注意到预览框架不尊重单元格的角半径.

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
}

我已经尝试设置previewingContext sourceView的角半径,并在单元格上使用masksToBounds,但到目前为止我没有尝试过任何帮助.

这是单元设置:

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

有人有什么建议吗？

Answer 1

正如我理解你的那样,你想拥有第一个而不是第二个:

问题是您在整个视图上注册通知.这样的事情: registerForPreviewingWithDelegate(self, sourceView: self.view)那就是为什么你所触摸的区域对细胞层一无所知.

你应该做什么 - 亲自登记每个细胞:

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)
    }
}

然后换previewingContext.sourceRect = self.view.convertRect(cell.frame, fromView: self.scholarsCollectionView)到previewingContext.sourceRect = cell.bounds

PS当然不要忘记删除registerForPreviewingWithDelegate你的视图:)