"insetGrouped" 样式的单元格预览圆角 (iOS 13)

Question

当 UITableView 处于 insetGrouped 样式时，我发现了一个烦人的问题。当实现 contextMenuConfigurationForRowAtIndexPath 方法时，它允许使用上下文操作来查看和弹出单元格预览。一切正常，除了 iOS 预览 window 圆角时的功能。

但是，如果 table 在所有其他样式（例如，普通样式）中，边角会变圆。此外，普通模式下的动画更多 "smooth" 并且预览会缩小一点。

我还发现 iOS 在 insetGrouped 样式中将第一个单元格的顶角和最后一个单元格的底角圆化。

有没有人遇到过类似UITableView的行为？

Answer 1

您可以通过实现方法为单元格设置圆角 'previewForHighlightingContextMenuWithConfiguration'

- (UITargetedPreview *)tableView:(UITableView *)tableView previewForHighlightingContextMenuWithConfiguration:(UIContextMenuConfiguration *)configuration {
NSIndexPath *index = (NSIndexPath *)configuration.identifier;
SharedTableViewCell *cell = [self.tableView cellForRowAtIndexPath:index];

UIPreviewParameters *parameters = [[UIPreviewParameters alloc] init];
parameters.backgroundColor = UIColor.clearColor;
parameters.visiblePath = [UIBezierPath bezierPathWithRoundedRect:cell.bounds cornerRadius:10.0];
UITargetedPreview *targetedPreview = [[UITargetedPreview alloc] initWithView:cell parameters:parameters];

return targetedPreview;

}

Answer 2

override func tableView(_ tableView: UITableView,
                              previewForDismissingContextMenuWithConfiguration configuration: UIContextMenuConfiguration) -> UITargetedPreview? {
    return self.tableView(tableView, previewForHighlightingContextMenuWithConfiguration: configuration)
  }
  
  override func tableView(_ tableView: UITableView,
                          previewForHighlightingContextMenuWithConfiguration configuration: UIContextMenuConfiguration) -> UITargetedPreview? {
    guard let indexPath = configuration.identifier as? NSIndexPath else { return nil }
    guard let cell = tableView.cellForRow(at: indexPath as IndexPath) as? YourCellNameTableViewCell else { return nil }
    
    let parameters = UIPreviewParameters()
    parameters.backgroundColor = .clear
    parameters.visiblePath = UIBezierPath(roundedRect: cell.contentView.bounds, cornerRadius: cell.contentView.layer.cornerRadius)
    
    let preview = UITargetedPreview(view: cell.contentView, parameters: parameters)
    return preview
  }

不要忘记在您的单元格中设置：

 override func awakeFromNib() {
    super.awakeFromNib()
    // Initialization code

    layer.cornerRadius = 10.0
    clipsToBounds = true
}

同样的事情适用于 UICollectionViewCell，

override func collectionView(_ collectionView: UICollectionView,
                              previewForDismissingContextMenuWithConfiguration configuration: UIContextMenuConfiguration) -> UITargetedPreview? {
    return self.collectionView(collectionView, previewForHighlightingContextMenuWithConfiguration: configuration)
  }

  override func collectionView(_ collectionView: UICollectionView,
                          previewForHighlightingContextMenuWithConfiguration configuration: UIContextMenuConfiguration) -> UITargetedPreview? {
    guard let indexPath = configuration.identifier as? NSIndexPath else { return nil }
    guard let cell = collectionView.cellForItem(at: indexPath as IndexPath) as? YourCellNameCollectionViewCell else { return nil }

    let parameters = UIPreviewParameters()
    parameters.backgroundColor = .clear
    parameters.visiblePath = UIBezierPath(roundedRect: cell.contentView.bounds, cornerRadius: cell.contentView.layer.cornerRadius)

    let preview = UITargetedPreview(view: cell.contentView, parameters: parameters)
    return preview
  }

Answer 3

Swift版本[Tài Mẫn Tiến答案]

确保正确返回 IndexPath。

 return UIContextMenuConfiguration(identifier: indexPath as NSCopying, previewProvider: nil,actionProvider: { suggestedActions in })

Swift代码：

 func tableView(_ tableView: UITableView, previewForHighlightingContextMenuWithConfiguration configuration: UIContextMenuConfiguration) -> UITargetedPreview? {


     guard let indexPath = configuration.identifier as? IndexPath else { return nil }
     guard let cell = tableView.cellForRow(at: indexPath) as? YourCellName else {

         return nil }

     let parameters = UIPreviewParameters()
     parameters.backgroundColor = UIColor.clear
     parameters.visiblePath = UIBezierPath(roundedRect: cell.bounds , cornerRadius: 10.0)
     var targetedPreview: UITargetedPreview? = nil
     targetedPreview = UITargetedPreview(view: cell, parameters: parameters)

     return targetedPreview
 }

"insetGrouped" 样式的单元格预览圆角 (iOS 13)

Rounded corners for cell preview in the "insetGrouped" style (iOS 13)

ios

uitableview

animation

contextmenu

ios13