UIDocumentInteractionController的奇怪问题 [英] Strange issue with UIDocumentInteractionController

问题描述

我不知道这段代码有什么问题，但每当我运行应用程序时，在显示菜单后，应用程序崩溃。

  NSString * path = [[NSBundle mainBundle] pathForResource：@tungofType：@doc]; 
 
 UIDocumentInteractionController * docController = [UIDocumentInteractionController interactionControllerWithURL：[NSURL fileURLWithPath：path]]; 
 
 docController.delegate = self; 
 
 // [docController presentPreviewAnimated：YES]; 
 
 CGRect rect = CGRectMake（0,0,300,300）; 
 [docController presentOptionsMenuFromRect：rect inView：self.view animated：YES]; 
  

我收到错误：

***由于未捕获的异常'NSGenericException'终止应用程序，
原因：' - [UIPopoverController
dealloc]达到，而popover仍然可以看到
。'

我现在该怎么办？

解决方案

要通过一次性UIDocumentInteractionController预览文档，您应该在interactionControllerWithURL之后保留它，并在UIDocumentInteractionControllerDelegate方法documentInteractionControllerDidDismissOptionsMenu中自动释放它。正如David Liu所说，释放它会崩溃。但是自动释放工作。我已经检查过dealloc实际上是被调用的。

以下代码应该可以工作：

 
  
  - （void）previewDocumentWithURL：（NSURL *）url 
 {
 UIDocumentInteractionController * preview = [UIDocumentInteractionController interactionControllerWithURL：url]; 
 preview.delegate = self; 
 [预览presentPreviewAnimated：YES]; 
 [预览保留]; 
} 
  - （void）documentInteractionControllerDidEndPreview：（UIDocumentInteractionController *）controller 
 {
 [controller autorelease]; 
} 
 




I don't know what wrong with this code but everytime when I run the app, after the Menu is shown, the app crash.

NSString * path = [[NSBundle mainBundle] pathForResource:@"tung" ofType:@"doc"];

UIDocumentInteractionController *docController = [UIDocumentInteractionController interactionControllerWithURL:[NSURL fileURLWithPath:path]];

docController.delegate = self;

//[docController presentPreviewAnimated:YES];

CGRect rect = CGRectMake(0, 0, 300, 300);
[docController presentOptionsMenuFromRect:rect inView:self.view animated:YES];

Error I got:

*** Terminating app due to uncaught exception 'NSGenericException', reason: '-[UIPopoverController dealloc] reached while popover is still visible.'

What should I do now ?

解决方案

To preview a document via a "throwaway" UIDocumentInteractionController you should retain it after interactionControllerWithURL and autorelease it in the UIDocumentInteractionControllerDelegate method documentInteractionControllerDidDismissOptionsMenu. As remarked by David Liu, releasing it will crash. But autoreleasing works. I have checked that dealloc is actually called.

The following code should work:

- (void)previewDocumentWithURL:(NSURL*)url
{
    UIDocumentInteractionController* preview = [UIDocumentInteractionController interactionControllerWithURL:url];
    preview.delegate = self;
    [preview presentPreviewAnimated:YES];
    [preview retain];
}
- (void)documentInteractionControllerDidEndPreview:(UIDocumentInteractionController *)controller
{
    [controller autorelease];
}

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