添加QLPreviewController作为子视图会关闭图像拖动视图

Question

我将QLPreviewController作为子视图添加到我的QLPreviewControllerWithDownloadView。

然后当我展示我的QLPreviewControllerWithDownloadView并让它预览图像时，如果在图像上检测到任何平移，我的QLPreviewControllerWithDownloadView视图会立即被解除。

关于如何阻止视图解除阻力的任何想法？

Sample Swift Project

Movie of Issue

Answer 1

我通过颠倒我的想法来解决这个问题。我没有将QLPreviewController作为子视图添加，而是将QLPreviewController子类化，并将我的下载视图添加为子视图。

class QuickLookViewController: QLPreviewController {

//Download View Properties
var downloadViewController: DownloadFileViewController?

// MARK: - Application Life Cycle

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    guard let downloadView = self.downloadViewController?.view else { return }
    view.bringSubview(toFront: downloadView)
}

override func viewDidLoad() {
    super.viewDidLoad()
    addDownloadViewIfNeeded()
    downloadAndPreview()
}

// MARK: - Private

private func addDownloadViewIfNeeded() {
    guard self.downloadViewController == nil else { return }

    let downloadViewController = DownloadFileViewController.viewControllerFromStoryboard()
    downloadViewController.view.isHidden = true
    downloadViewController.delegate = self

    addChildViewController(downloadViewController)
    view.addSubview(downloadViewController.view)
    downloadViewController.view.pinFrameToSuperViewBounds()
    downloadViewController.didMove(toParentViewController: self)

    self.downloadViewController = downloadViewController
}

...
}