Peek/Pop預覽忽略集合視圖中的單元圓角半徑

Question

我已將3D Touch Peek/Pop功能添加到我的集合視圖單元中並且效果很好，但是我注意到預覽框架並不尊重圓角的半徑細胞。

這是我的預覽功能：

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 
} 

我已經嘗試設置previewingContext sourceView的圓角半徑，並與細胞masksToBounds玩耍，但沒有到目前爲止，我已經試過了幫助。

這裏的小區建立：

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

任何人有什麼建議？

Answer 1

正如我理解正確的話，你想擁有像第一，而不是第二：

問題是，你註冊的全視圖通知。就像這樣： registerForPreviewingWithDelegate(self, sourceView: self.view)，那爲什麼你碰到的區域對細胞層一無所知。

你應該做的 - 個人註冊的每一個細胞：

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) 
    } 
} 

而只是改變previewingContext.sourceRect = self.view.convertRect(cell.frame, fromView: self.scholarsCollectionView)到previewingContext.sourceRect = cell.bounds

附：當然，不要忘記刪除registerForPreviewingWithDelegate你的看法:)