ios - QLPreviewController NavigationBar barTintColor
<p><p>当我<code>self.present()</code> <code>QLPreviewController</code>时，它的<code>NavigationBar</code>失去颜色，这是在<code>AppDelegate</code>中实现的>.</p>
<pre><code> UINavigationBar.appearance().isTranslucent = false
UINavigationBar.appearance().tintColor = UIColor.white
UINavigationBar.appearance().barTintColor = Colors.fifth // Blue color
UINavigationBar.appearance().titleTextAttributes =
UINavigationBar.appearance().shadowImage = UIImage()
</code></pre>
<p><code>QLPreviewController</code> 实现:</p>
<pre><code>let preview = QLPreviewController()
preview.dataSource = self
func numberOfPreviewItems(in controller: QLPreviewController) -> Int {
return 1
}
func previewController(_ controller: QLPreviewController, previewItemAt index: Int) -> QLPreviewItem {
return fileURL! as QLPreviewItem
}
fileprivate func showDocument(fileId: Int) {
SVProgressHUD.show()
self.fileService.download(id: fileId) {
url, error in
if error == nil {
self.fileURL = url
if QLPreviewController.canPreview(self.fileURL! as QLPreviewItem) {
self.present(self.preview, animated: true, completion: nil)
SVProgressHUD.dismiss()
} else {
SVProgressHUD.showDismissableError(with: "Произошла ошибка во время чтения файла \(url!.lastPathComponent)")
}
} else {
SVProgressHUD.showDismissableError(with: error?.localizedDescription)
}
}
}
</code></pre>
<p>我尝试 <code>self.show()</code> 并且它的 <code>NavigationBar</code> 是 <strong>OK</strong>!
我想将 <code>QLPreviewController 的 NavigationBar</code> 颜色设置为与 <code>AppDelegate 的 UINavigationBar</code> 具有相同的设置。如何以编程方式更改它？提前致谢!</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>首先将 <strong>UINavigationController</strong> 和您的 <strong>QLPreviewController</strong> 实例化为它的 <strong> Root ViewController </strong>。然后，您可以显示该导航栏，该导航栏将具有您在应用委托(delegate)类中设置的属性。</p>
<pre><code> let preview = QLPreviewController()
preview.dataSource = self
preview.currentPreviewItemIndex = 0
let navBar = UINavigationController(rootViewController: preview)
let doneButton = UIBarButtonItem(barButtonSystemItem: .done, target: self, action: #selector(self.dismissQLPreviewController))
preview.navigationItem.leftBarButtonItem = doneButton
self.present(navBar, animated: true)
</code></pre></p>
<p style="font-size: 20px;">关于ios - QLPreviewController NavigationBar barTintColor，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/47673587/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/47673587/
</a>
</p>
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