swift - iOS12 : transitionController was deprecated

Question

我有一个基于 UIDocumentBrowser 的应用程序，它可以打开特定类型的文件。打开文件的默认过渡是从底部滑动，这不是用户可以期望的最好的过渡。在 iOS 12 之前，您可以获得缩放过渡，它现在也可以工作，但编译器提示使用已弃用的 transitionController(forDocumentURL:)。我怎样才能以 iOS 12 的方式实现这种效果？

func presentDocument(at documentURL: URL) {
    let storyBoard = UIStoryboard(name: "Main", bundle: nil)
    let documentViewController = storyBoard.instantiateViewController(withIdentifier: "MainViewController") as! MainViewController
    documentViewController.document = Document(fileURL: documentURL)
    // 
    documentViewController.transitioningDelegate = self
    let transitioningController = transitionController(forDocumentURL: documentURL)
    transitioningController.targetView = documentViewController.view
    self.transitioningController = transitioningController
    //
    present(documentViewController, animated: true, completion: nil)
}

Answer 1

我相信参数刚刚更改，您可以将 forDocumentURL 替换为 forDocumentAt :

let transitioningController = transitionController(forDocumentAt: documentURL)