ios - iOS 未调用 UIDocumentPickerDelegate 方法(didPickDocumentsAt)
<p><p>我有一个关于没有为 DocumentPickerViewController 调用委托(delegate)方法的查询,这是背景,我只需要从我的文件应用程序中导入任何可用的资源,因此我正在使用 UIDocumentPickerViewController。</p>
<p>我有一个单独的 ViewController,我将 documentPickerViewController 的 View 添加为 subview 并添加它的委托(delegate)。我的 ViewController 的代码是这样的。</p>
<pre><code>var documentPickerController: UIDocumentPickerViewController!
let supportedUTI =
documentPickerController = UIDocumentPickerViewController.init(documentTypes: supportedUTI as , in: .import)
documentPickerController.delegate = self
documentPickerController.allowsMultipleSelection = false
view.addSubview(documentPickerController.view)
</code></pre>
<p>现在我看到pickercontroller 已打开,当我点击取消时 <code>documentPickerWasCancelled</code> 被调用,但是当我选择文件时 <code>documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: </code> 没有被调用。</p>
<p>如果我像这样直接显示pickerViewController </p>
<pre><code>UIDocumentPickerViewController *dc = [ initWithDocumentTypes: inMode:UIDocumentPickerModeImport];
dc.delegate = self;
;
</code></pre>
<p>这两个委托(delegate)方法都被调用得很好。我不明白为什么。有人可以在这里帮我吗!提前致谢!!</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>所以我遇到了完全相同的问题,调用了 <code>documentPickerWasCancelled</code> 委托(delegate)方法,但不会调用 <code>didPickDocumentsAt</code>。</p>
<p>另外值得注意的是,当我将所有委托(delegate)/演示逻辑移到我的基本 ViewController 中时,UIPickerDelegate 方法按预期工作。这让我知道没有任何配置类型问题阻止功能。</p>
<p>我不确定问题出在哪里,但似乎如果文档选择器出现在复杂的 View 层次结构上,就会出现问题。</p>
<p>我最终解决此问题的方法是创建一个新窗口并在那里显示文档选择器:</p>
<pre><code>func showDocumentPicker() {
let documentTypes = ["public.image", "com.adobe.pdf"]
let picker = UIDocumentPickerViewController(documentTypes: documentTypes, in: .import)
picker.delegate = self
picker.allowsMultipleSelection = true
picker.modalPresentationStyle = .formSheet
let window = UIWindow(frame: UIScreen.main.bounds)
let newWindowBaseVC = UIViewController()
newWindowBaseVC.view.backgroundColor = UIColor.clear
window.rootViewController = newWindowBaseVC
window.windowLevel = UIWindow.Level.alert
window.makeKeyAndVisible()
newWindowBaseVC.present(picker, animated: false, completion: nil)
}
</code></pre></p>
<p style="font-size: 20px;">关于ios - iOS 未调用 UIDocumentPickerDelegate 方法(didPickDocumentsAt),我们在Stack Overflow上找到一个类似的问题:
<a href="https://stackoverflow.com/questions/54234901/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/54234901/
</a>
</p>
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