当我调用UIDocumentInteractionController方法“presentOpenInMenuFromRect：inView：animated：”时，iPad应用程序崩溃

Question

这是我的代码：在iPad中它崩溃了，列表正在出现，但所选应用程序没有打开。

- (void)openIn:(NSURL *)fileFullPath {
    docController = [UIDocumentInteractionController interactionControllerWithURL:fileFullPath];
    [docController setDelegate:self];

    BOOL isOpen = [docController presentPreviewAnimated:YES];

    if (isOpen == NO) {
        BOOL isOpenIn = [docController presentOpenInMenuFromRect:CGRectMake(300, 300, 100, 100) inView:self.view animated:NO];

        if(isOpenIn == NO) {
            return ;
        }
    }
}

Answer 1

根据Lupos的回答，为docController定义一个实例变量修复了你所看到的同一个问题。

我没有足够的声誉评论他的答案。

// In your .h file
@property (nonatomic, strong) UIDocumentInteractionController *docController;

// When calling in your .m
docController = [UIDocumentInteractionController interactionControllerWithURL:fileFullPath];

Answer 2

如果它仍然相关，则问题可能是UIDocumentInteractionController从内存中释放。尝试将其定义为实例变量。