ios - 有视频: After Peek and Pop (3D Touch) background keeps scrolling
<p><p>错误视频:<a href="https://www.dropbox.com/s/zn4h1xmv3ts3lqa/IMG_0046.MOV?dl=0" rel="noreferrer noopener nofollow">Video</a> </p>
<p>我有一个带有 UITableViewCells 的常规表格 View 。它看起来像消息。我有另一个 ViewControllerOperationDetailsViewController。</p>
<p>在 TableView 委托(delegate)中我有这个:</p>
<pre><code>// need that dict for 3D touch
var dict_previwingControllers_cellIsKey = ()
func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
// setup peek and pop (register proper view)
if traitCollection.forceTouchCapability == .available, let cellForChat = cell as? OperationsSingleCell {
let previewingController = registerForPreviewing(with: self, sourceView: cellForChat.viewTextBG)
dict_previwingControllers_cellIsKey = previewingController // remember because we need to unregister
}
}
func tableView(_ tableView: UITableView, didEndDisplaying cell: UITableViewCell, forRowAt indexPath: IndexPath) {
// setup peek and pop (unregister)
if traitCollection.forceTouchCapability == .available {
if let previwingController = dict_previwingControllers_cellIsKey {
unregisterForPreviewing(withContext: previwingController)
}
}
}
</code></pre>
<p>要在用户点击消息背景时显示预览，我有这个:</p>
<pre><code>/// Create a previewing view controller to be shown at "Peek".
func previewingContext(_ previewingContext: UIViewControllerPreviewing, viewControllerForLocation location: CGPoint) -> UIViewController? {
// Obtain cell by previewing context
guard let cell = (dict_previwingControllers_cellIsKey as NSDictionary).allKeys(for: previewingContext).first as? OperationsSingleCell else {return nil}
// guard let indexPath = tableViewMain.indexPathForRow(at: location),
// let cell = tableViewMain.cellForRow(at: indexPath) as? OperationsSingleCell else { return nil }
guard let operationDetailsVC = storyboard?.instantiateViewController(withIdentifier: "OperationDetailsVC") as? OperationDetailsVC else {return nil}
// custom properties
operationDetailsVC.dbOrder = cell.dbOrder
operationDetailsVC.navigationControllerOfParentVC = navigationController
// need to load view so we will know content size
operationDetailsVC.view.reloadInputViews()
let contentHeight = operationDetailsVC.scrollViewMain.contentSize.height
/*
Set the height of the preview by setting the preferred content size of the detail view controller.
Width should be zero, because it's not used in portrait.
*/
operationDetailsVC.preferredContentSize = CGSize(width: 0.0, height: contentHeight)
// Set the source rect to the cell frame, so surrounding elements are blurred.
previewingContext.sourceRect = cell.viewTextBG.bounds
return operationDetailsVC
}
/// Present the view controller for the "Pop" action.
func previewingContext(_ previewingContext: UIViewControllerPreviewing, commit viewControllerToCommit: UIViewController) {
// Reuse the "Peek" view controller for presentation.
show(viewControllerToCommit, sender: self)
}
</code></pre>
<p>但是当用户使用 3D Touch 时，背景会像视频一样滚动</p>
<p>这很奇怪，因为在 iMessage 应用程序中它不会发生</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>我尝试过使用默认的 tableView，但我没有这种情况。也就是说，当我3d触摸我的tableView单元格时，它会弹出detailView，并且背景 View (tableView)不可滚动。</p>
<p>另外，您不必注册预览每个单元格，您可以一次注册整个 tableview 单元格。</p>
<pre><code>class ViewController: UIViewController {
@IBOutlet weak var tableView: UITableView!
override func viewDidLoad() {
super.viewDidLoad()
if traitCollection.forceTouchCapability == .available {
registerForPreviewing(with: self, sourceView: tableView)
}
}
}
extension ViewController: UITableViewDataSource, UITableViewDelegate {
func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return 20
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
cell.textLabel?.text = "Hello World"
return cell
}
}
</code></pre>
<p><strong>预览委托(delegate)</strong> </p>
<pre><code>extension ViewController: UIViewControllerPreviewingDelegate {
func previewingContext(_ previewingContext: UIViewControllerPreviewing, viewControllerForLocation location: CGPoint) -> UIViewController? {
guard let indexPath = tableView.indexPathForRow(at: location) else { return nil }
guard let cell = tableView.cellForRow(at: indexPath) else { return nil }
guard let operationDetailsVC = storyboard?.instantiateViewController(withIdentifier: "OperationDetailsVC") as? OperationDetailsVC else { return nil }
operationDetailsVC.preferredContentSize = CGSize(width: 0, height: 300)
previewingContext.sourceRect = cell.frame
// You can decide to return a viewController or nil for certain cell
return operationDetailsVC
}
func previewingContext(_ previewingContext: UIViewControllerPreviewing, commit viewControllerToCommit: UIViewController) {
show(viewControllerToCommit, sender: self)
}
}
</code></pre></p>
<p style="font-size: 20px;">关于ios - 有视频: After Peek and Pop (3D Touch) background keeps scrolling，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/41498924/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/41498924/
</a>
</p>
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