UIWebView和Swift：检测视频何时开始播放 [英] UIWebView and Swift: Detect when a video starts playing

问题描述

在Objective-C中，我订阅了 UIWindowDidBecomeVisibleNotification ，以了解某些视图是否超出了我当前的视图控制器，使用：

In Objective-C, I subscribed to the UIWindowDidBecomeVisibleNotification to know if some view gets above my current view controller, using:

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(videoStartedPlaying:)
                                             name:UIWindowDidBecomeVisibleNotification
                                           object:nil];

到目前为止，非常好。然后，在通知中，我可以检查对象是否不某些类（例如 _UIAlertControllerShimPresenterWindow -alert views-或 UITextEffectsWindow -native sharing view-）。在Objective-C中，我这样做：

So far, so good. Then, in the notification, I could check if the object is not of certain classes (like _UIAlertControllerShimPresenterWindow -alert views- or UITextEffectsWindow -native sharing view-). In Objective-C, I did it this way:

- (void)videoStartedPlaying:(NSNotification *)notification
{
    if (
        <radio_is_playing>
        &&
        ! [notification.object isKindOfClass:NSClassFromString(@"_UIAlertControllerShimPresenterWindow")] // Alert view
        &&
        ! [notification.object isKindOfClass:NSClassFromString(@"UITextEffectsWindow") ] // Share
        )
    {
        // Video, stop the radio stream
    }
}

这让我停止播放声音（在这种情况下，从 UIWebView （用于显示新闻）开始播放视频时的HTTP广播流。我试图在Swift中做同样的事情，所以我订阅了通知：

This allowed me to stop playing sounds (in this case, an HTTP radio streaming) when starting a video from a UIWebView (which is used to present news). I've tried to do the same thing in Swift, so I subscribed to the notification:

NSNotificationCenter.defaultCenter().addObserver(self, selector: "videoStartedPlaying:", name: UIWindowDidBecomeVisibleNotification, object: nil)

现在，收到通知时......

And now, when receiving the notification...

func videoStartedPlaying(notification: NSNotification) {
    if <radio_is_playing> && !notification.object? is _UIAlertControllerShimPresenterWindow && !notification.object? is UITextEffectsWindow {
        // Stop the radio stream
    }
}

Xcode说使用未声明的类型'_UIAlertControllerShimPresenterWindow'。 UITextEffectsWindow 也会发生同样的事情。

Xcode says Use of undeclared type '_UIAlertControllerShimPresenterWindow'. The same thing happens with UITextEffectsWindow.

我认为我必须导入某些东西检测这些类，但我应该导入什么？

I assume that I have to import something to detect those classes, but what should I import?

有没有其他方法可以在没有桥接Objective-C的情况下执行此操作？我怎么能访问那个班级？

Is there any other way to do it without bridging Objective-C? How could I access that class?

提前谢谢你。

推荐答案

您可以比较班级名称而不是班级本身，请参阅这里获取班级名称。

you could compare the class name instead the class itself, refer here to get the class name.

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