如何在UIWebView中暂停媒体播放 [英] How to Pause Media Playback in UIWebView

问题描述

我目前正在使用支持iPad上多个选项卡的浏览器.问题是iOS不允许同时播放多个音频/视频的选项卡，尝试这样做会导致出现问题，例如所有音频停止播放而无法返回.

I am currently working on a browser that supports multiple tabs on the iPad. Problem is iOS doesn't allow for more than one tab to be playing audio/video at the same time, trying this causes issues to arise such as all the audio to stop and not come back.

我注意到Google Chrome浏览器实际上停止了处于非活动状态的标签中的媒体.我想知道他们如何去做.我知道可以通过[webView loadRequest:NSURLRequestWithString(@"about:blank")];语句完全停止媒体，但是这会使页面显示空白屏幕.我只想暂停媒体.

I have noticed that Google Chrome's browser actually stops the media in the tab that goes inactive. I am wondering how they go about it. I know it is possible to completely stop the media via a [webView loadRequest:NSURLRequestWithString(@"about:blank")]; statement but that causes the page to display a blank screen. I would like to merely pause the media.

我可以执行一些JavaScript来停止UIWebView中的媒体吗?如果是这样，它会是什么样子(我以前从未接触过javascript)?

Is there some javascript I can execute that will stop the media in the UIWebView? If so, what would it look like (I have never touched javascript before)?

提前谢谢！

推荐答案

由于您可以执行[webView stringByEvaluatingJavaScriptFromString:]，因此这里有一些简单的方法.

Since you can do [webView stringByEvaluatingJavaScriptFromString:] there is are she simple methods.

例如，您可以执行以下操作:

For example you could do this:

[webview stringByEvaluatingJavaScriptFromString: @"document.querySelector('video').pause();"]

当然，这只会停止播放第一个视频，因此在iPad上，脚本需要稍微复杂一些，并遍历页面上的所有视频.

Of course this would only stop the first video, so on iPad the script needs to be a little bit more sophisticated and loop through all the videos on the page.

var videos = document.querySelectorAll("video");
for (var i = videos.length - 1; i >= 0; i--){
        videos[i].pause();
};

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