警告的含义“在演示文稿正在进行时！” [英] Meaning of Warning "while a presentation is in progress!"

问题描述

当我在我的项目中整合 Instagram 时。我从 UIImagePickerController 获得图片，之后我想将其发送到 Instagram 但当我通过 Instagram 发送 image 时，UIDocumentInteractionController 委托方法 presentOptionsMenuFromRect：inView：animated： like this

When I am integarting the Instagram in my project. I am getting a image from UIImagePickerController and after it i want to send it to Instagram But when I am sending image to Instagram by UIDocumentInteractionController delegate method presentOptionsMenuFromRect:inView: animated: like this

[documentInteractionController presentOptionsMenuFromRect:CGRectZero inView:self.view animated:YES];

警告来自警告：在演示文稿时尝试显示< _UIDocumentActivityViewController：0x7584780>正在进行中！


应用程序没有崩溃。但我没有得到问题。为什么会出现此警告及其含义。我在互联网上搜索并阅读有关此问题，但没有得到任何答案。帮助我!!

The warning comes Warning: Attempt to present <_UIDocumentActivityViewController: 0x7584780> on while a presentation is in progress!
The application is not Crashing. But I am not getting the Problem. Why this warning comes and what It means. I searched on Internet and read questions about this but not got any answer. Help me !!

推荐答案

// Breaks
[viewController1 dismissViewControllerAnimated:YES completion:NULL];
[self presentViewController:viewController2 animated:YES completion:NULL];

// Does not break
[viewController1 dismissViewControllerAnimated:YES completion:^{
    [self presentViewController:viewController2 animated:YES completion:NULL];
}];

以上代码的Swift 3版本如下所示：

The Swift 3 version of the above code would look like this:

// Breaks
viewController1.dismiss(animated: true)
present(viewController2, animated: true)

// Does not break
viewController1.dismiss(animated: true) {
    present(viewController2, animated: true)
}

注意在上面第二个例子中使用完成处理程序。

只显示 viewController2 viewController1 完全被解雇后。

Note the use of the completion handler in the second example above.
It only presents viewController2 after viewController1 has been fully dismissed.

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