UIActivity activityViewController 在 iPad 上以模态方式呈现，而不是在弹出窗口中 [英] UIActivity activityViewController being presented modally on iPad instead of in popover

问题描述

在 iOS 6 中使用客户 UIActivity 子类时，可以指定自定义视图控制器，当您从初始 UIActionViewController 的视图中选择您的操作时将显示该控制器.为此，您可以从 UIActivity 子类的 activityViewController 方法返回对自定义视图控制器的引用.

When using a customer UIActivity subclass in iOS 6, it's possible to specify a custom view controller that will be displayed when your action is chosen from the initial UIActionViewController's view. You do this by returning a reference to a custom view controller from your UIActivity subclass's activityViewController method.

根据UIActivity 类参考:

activityViewController

此方法的默认实现返回 nil.使用视图控制器提供额外 UI 的子类可以重写此方法以返回该视图控制器.如果此方法返回一个有效对象，系统会为您呈现返回的视图控制器，而不是调用 performActivity 方法.在 iPad 上，您的视图控制器显示在弹出框内.在 iPhone 和 iPod touch 上，您的视图控制器以模态方式呈现.

The default implementation of this method returns nil. Subclasses that provide additional UI using a view controller can override this method to return that view controller. If this method returns a valid object, the system presents the returned view controller for you, instead of calling the performActivity method. On iPad, your view controller is presented inside of a popover. On iPhone and iPod touch, your view controller is presented modally.

您的自定义视图控制器应该为您的自定义 UI 提供一个视图，并且应该处理这些视图中的任何用户交互.完成活动后，不要自行关闭视图控制器.相反，调用 activityDidFinish: 方法并让系统为您关闭它.

Your custom view controller should provide a view with your custom UI and should handle any user interactions inside those views. Upon completing the activity, do not dismiss the view controller yourself. Instead, call the activityDidFinish: method and let the system dismiss it for you.

请注意第一段末尾的那一点:在 iPad 上，您的视图控制器显示在弹出框内.在 iPhone 和 iPod touch 上，您的视图控制器以模态方式呈现.

Note that bit at the end of the first paragraph: On iPad, your view controller is presented inside of a popover. On iPhone and iPod touch, your view controller is presented modally.

然而，在 iPad 上，由 activityViewController 返回的视图控制器总是以模态显示，无论我如何呈现 UIActivityViewController(模态或通过弹出框).当通过弹出框呈现时，它会导致它崩溃，因为它认为它没有被关闭.

However, on iPad the view controller returned by activityViewController always displays modally, no matter how I present the UIActivityViewController (either modally or via a popover). When presenting via a popover, it causes it to crash since it doesn't think it's been dismissed.

我做错了什么?这是 iOS 6 中的错误吗?

What am I doing wrong? Is this a bug in iOS 6?

更新:这是一个说明问题的简单 Xcode 项目.随意克隆它，看看你是否能看出我们哪里出错了:github.com/simonwhitaker/GSActivityDemo

推荐答案

正如我们所说的 UIActivityViewController，它是向用户显示可用活动的视图.苹果声明如下...

As we are talking about the UIActivityViewController, which is the view showing the available activities to the user. Apple state the following...

您的应用负责配置、呈现和关闭此视图控制器.视图控制器的配置包括指定视图控制器应该操作的数据对象.(您还可以指定您的应用程序支持的自定义服务列表.)当呈现视图控制器时，您必须使用当前设备的适当方式来执行此操作.在 iPad 上，您必须在弹出窗口中显示视图控制器.在 iPhone 和 iPod touch 上，您必须以模态方式呈现.

Your app is responsible for configuring, presenting, and dismissing this view controller. Configuration for the view controller involves specifying the data objects on which the view controller should act. (You can also specify the list of custom services your app supports.) When presenting the view controller, you must do so using the appropriate means for the current device. On iPad, you must present the view controller in a popover. On iPhone and iPod touch, you must present it modally.

我将最后一行作为您必须处理视图呈现方式的标志，因此我检查代码是否在 iPad 上运行并相应地使用 UIPopover.正如你可以在这里看到的那样...... https://github.com/bufferapp/buffer-uiactivity/blob/master/BufferUIActivity/Views/FirstViewController.m 在下面的方法中.

I took the last line as a sign that you have to handle how the view is presented, so I check whether the code is running on iPad and use a UIPopover accordingly. As you can sere here... https://github.com/bufferapp/buffer-uiactivity/blob/master/BufferUIActivity/Views/FirstViewController.m within the following method.

-(IBAction)openUIActivityView:(id)sender {

    NSString *text = @"Hello world";
    NSString *url = @"http://bufferapp.com";


    NSArray *activityItems = @[text, url];

    BufferUIActivity *bufferActivity = [[BufferUIActivity alloc] init];

    UIActivityViewController *activityView = [[UIActivityViewController alloc] initWithActivityItems:activityItems applicationActivities:@[ bufferActivity ]];


    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone) {
        [self presentViewController:activityView animated:YES completion:^{

        }];
    } else {
        // Change Rect to position Popover
        self.popup = [[UIPopoverController alloc] initWithContentViewController:activityView];
        [self.popup presentPopoverFromRect:CGRectMake(self.view.frame.size.width/2, self.view.frame.size.width/2, 100, 100) inView:self.view permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
    }

}

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