Question

我有一个UITableView，并且在每个单元格中都有一个UIView作为子视图。我现在拥有的是UITapGestureRecognizer，只要我单击其中的In-App-Safari之一，即可打开UIViews。但是，我正在努力实现Apples sample code的peek and pop功能以实现强制触摸。我的代码如下：

 @IBOutlet var mainTableView: UITableView!

在 viewDidLoad（）中：

 registerForPreviewing(with: self as! UIViewControllerPreviewingDelegate, sourceView: mainTableView)

viewDidLoad（）之后：

 func previewingContext(_ previewingContext: UIViewControllerPreviewing, viewControllerForLocation location: CGPoint) -> UIViewController? {
            // First, get the index path and view for the previewed cell.
        guard let indexPath = tableView.indexPathForRow(at: location),
              let cell = tableView.cellForRow(at: indexPath)
              else { return nil }

 //Enable blurring of other UI elements, and a zoom in animation while peeking.

 previewingContext.sourceRect = cell.frame

 //Create and configure an instance of the color item view controller to show for the peek.

 guard let url = someURL else { return nil }
            let vc = SFSafariViewController(url: url)
            vc.delegate = self as SFSafariViewControllerDelegate

            return vc
        }

        func previewingContext(_ previewingContext: UIViewControllerPreviewing, commit viewControllerToCommit: UIViewController) 
{

//Push the configured view controller onto the navigation stack.

 navigationController?.pushViewController(viewControllerToCommit, animated: true)
}

Xcode返回错误，例如

收到的内存压力事件4 vm pressure 1

和

由于未捕获的异常'NSInvalidArgumentException'而终止了应用程序，原因：'-[ViewController PreviewingContext：viewControllerForLocation：]：无法识别的选择器发送到实例

我还没有找到一种解决方法，可以在按UIView时窥视和弹出Web内容。

Answer 1

好的，所以我发现我只是忘记将UIViewControllerPreviewingDelegate添加到我的班级：

class MyViewController: UITableViewController, UIViewControllerPreviewingDelegate, SFSafariViewControllerDelegate

窥视按规定的方法按预期工作，但是要使流行音乐起作用，我必须调整最后一个功能：

    func previewingContext(_ previewingContext: UIViewControllerPreviewing, commit viewControllerToCommit: UIViewController) {
    show(viewControllerToCommit, sender: self)
}

速览UIView显示SFSafariViewController

1 个答案: