iphone - UIDocumentInteractionController 的奇怪问题

Question

我不知道这段代码有什么问题，但每次运行应用程序时，显示菜单后，应用程序都会崩溃。

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];

我得到的错误:

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

我现在应该做什么？

Answer 1

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。但自动释放有效。我已经检查过确实调用了 dealloc。

下面的代码应该可以工作:

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