[英]Can't get QuickLook to work when trying to preview files
I am writing a macOS application with Swift using story boards.我正在使用故事板使用 Swift 编写 macOS 应用程序。 I have a NSTableView which contains files that I want the user to be able to preview via QuickLook.
我有一个 NSTableView,其中包含我希望用户能够通过 QuickLook 预览的文件。
I seemingly have everything in place and my code looks very similar to what has been described here: QuickLook consumer as a delegate from an NSViewController , but I keep getting the error我似乎已经准备好了一切,我的代码看起来与这里描述的非常相似: QuickLook consumer as a delegate from an NSViewController ,但我不断收到错误
-[QLPreviewPanel setDataSource:] called while the panel has no controller - Fix this or this will raise soon.
See comments in QLPreviewPanel.h for -acceptsPreviewPanelControl:/-beginPreviewPanelControl:/-endPreviewPanelControl:.
I've been trying to adapt the solution of above post to my situation with Swift and story boards.我一直在尝试使用 Swift 和故事板使上述帖子的解决方案适应我的情况。
The main pieces are:主要部分是:
import Quartz
class ViewController: NSViewController, QLPreviewPanelDataSource, QLPreviewPanelDelegate {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
let windowNextResponder = self.view.window?.nextResponder
self.view.window?.nextResponder = self
self.nextResponder = windowNextResponder
}
// *** Quicklook stuff ***
@IBAction func quickLookButtonAction(_ sender: Any) {
guard qlPanel != nil else {
return
}
if qlPanel!.currentController == nil {
print ("No controller")
//qlPanel!.windowController = self.view.window?.windowController
// qlPanel!.updateController()
} else {
print (qlPanel!.currentController)
}
qlPanel!.delegate = self
qlPanel!.dataSource = self
qlPanel!.makeKeyAndOrderFront(self)
}
func numberOfPreviewItems(in panel: QLPreviewPanel!) -> Int {
return CSVarrayController.selectedObjects.count
}
func previewPanel(_ panel: QLPreviewPanel!, previewItemAt index: Int) -> QLPreviewItem! {
let file = CSVarrayController.selectedObjects[index] as! CSVfile
return file.url as NSURL
}
override func acceptsPreviewPanelControl(_ panel: QLPreviewPanel!) -> Bool {
return true
}
override func beginPreviewPanelControl(_ panel: QLPreviewPanel!) {
panel.dataSource = self
panel.delegate = self
}
override func endPreviewPanelControl(_ panel: QLPreviewPanel!) {
panel.dataSource = nil
panel.delegate = nil
}
}
With or without messing with the responder chain I get the error.无论是否弄乱响应者链,我都会收到错误消息。 The delegate functions all get called as expected as well.
委托函数也都按预期调用。
Remove消除
qlPanel!.delegate = self
qlPanel!.dataSource = self
in quickLookButtonAction
, the viewcontroller isn't in control yet.在
quickLookButtonAction
, quickLookButtonAction
控制器尚未控制。 Wait for beginPreviewPanelControl
.等待
beginPreviewPanelControl
。
From the documentation for currentController
:从
currentController
的文档中:
You should never change the preview panel's state (its delegate, datasource, and so on) if you are not controlling it.
如果您不控制预览面板的状态(它的委托、数据源等),则永远不要更改它。
From comments in QLPreviewPanel.h for -beginPreviewPanelControl:
:来自 QLPreviewPanel.h 中
-beginPreviewPanelControl:
评论:
Sent to the object taking control of the Preview Panel.
发送到控制预览面板的对象。
The receiver should setup the preview panel (data source, delegate, binding, etc.) here.
接收方应在此处设置预览面板(数据源、委托、绑定等)。
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