presentOpenInMenuFromBarButtonItem:不会导致菜单出现 [英] presentOpenInMenuFromBarButtonItem: doesn't cause menu to appear

问题描述

我正在尝试通过 UIDocumentInteractionController 和 presentOpenInMenuFromBarButtonItem 显示打开方式菜单.这不会在屏幕上显示 UIDocumentInteractionController.奇怪的是，如果我用Options"替换OpenIn"，那么它会按预期工作.

I am attempting to display an Open In menu via UIDocumentInteractionController and presentOpenInMenuFromBarButtonItem. This does not bring up the UIDocumentInteractionController on screen. The weird thing is that if I replace "OpenIn" with "Options" then it will work as expected.

是什么导致 presentOpenInMenuFromBarButtonItem 不起作用?谢谢.

What is causing presentOpenInMenuFromBarButtonItem not to work? Thank you.

    NSString *fileName = [NSString stringWithFormat:@"[e-mail]", NSTemporaryDirectory()];
    [self.textToShare writeToFile:fileName
                       atomically:NO
                         encoding:NSUTF8StringEncoding
                            error:nil];

    NSURL *textFileURL = [NSURL fileURLWithPath:[NSTemporaryDirectory() stringByAppendingPathComponent:@"text.txt"]];

    self.openInController = [UIDocumentInteractionController interactionControllerWithURL:textFileURL];
    self.openInController.delegate = self;
    [self.openInController presentOpenInMenuFromBarButtonItem:self.buttonToPresentFrom animated:YES]; //replacing OpenIn with Options causes it to appear

推荐答案

问题是 presentOpenIn... 仅在安装了可以打开您发送的文件的应用程序时才显示菜单.iOS Simulator 没有任何可打开 .txt 文件的应用程序，因此它似乎无法正常工作.如果你在物理设备上运行，它工作得很好.

The problem is that presentOpenIn... only displays a menu when there are apps installed that can open the file you're sending. iOS Simulator does not have any apps that open .txt files, so it didn't seem to be working. If you run on physical device, it works just fine.

我决定添加这个以获得更好的行为:

I decided to add this for better behavior:

BOOL didPresentOpenIn = [self.openInController presentOpenInMenuFromBarButtonItem:self.buttonToPresentFrom animated:YES];
    if (!didPresentOpenIn) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"No Apps Available"
                                                        message:@"You do not have any apps installed that can open text files."
                                                       delegate:nil
                                              cancelButtonTitle:@"OK"
                                              otherButtonTitles:nil];
        [alert show];
    }

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