UIDocumentInteractionController导致未知的应用程序标识符com.apple.mobilemail失败错误

Question

我按下其中一个文档交互控制器按钮，即复制，打印等后出现以下错误：

Launch Services: Registering unknown app identifier com.apple.mobilemail failed
Launch Services: Unable to find app identifier com.apple.mobilemail

以下是创建交互控制器的代码 - URL等都是有效的，但是委托调用没有命中我的控制器，即使我已经实现了奇怪的委托方法：

UIDocumentInteractionController *documentInteractionController = [UIDocumentInteractionController interactionControllerWithURL:fileURL];
documentInteractionController.delegate = self;
[documentInteractionController presentOptionsMenuFromRect:self.view.bounds
                                                                inView:self.view
                                                              animated:YES];

//None of these delegate methods are ever called which is weird:
- (void) documentInteractionController: (UIDocumentInteractionController *) controller
         willBeginSendingToApplication: (NSString *) application
{
    DebugLog(@"skldjfklsdjflksdjflsdk %@", application);
}



- (void) documentInteractionController: (UIDocumentInteractionController *) controller
            didEndSendingToApplication: (NSString *) application
{
    DebugLog(@"skldjfklsdjflksdjflsdk %@", application);    
}

- (void)documentInteractionControllerDidDismissOptionsMenu:(UIDocumentInteractionController *)controller
{

}

- (void)documentInteractionControllerDidDismissOpenInMenu:(UIDocumentInteractionController *)controller
{

}

Answer 1

我设法解决了这个问题 - 由于某种原因或其他原因，类中存在自动释放错误，并且在启动交互控制器时需要使用属性 - 非常奇怪，但对我来说非常有效：

@property (nonatomic, strong) UIDocumentInteractionController *documentInteractionController;

self.documentInteractionController = [UIDocumentInteractionController interactionControllerWithURL:fileURL];
self.documentInteractionController.delegate = self;
[self.documentInteractionController presentOptionsMenuFromRect:self.view.bounds
                                                            inView:self.view
                                                          animated:YES];