blocks|key|418327|text|不，没有办法直接从UIWebView获得网页事件。但是我们可以通过使用Javascript来实现这一点。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|418328|首先，您使用自定义HTML中的嵌入Javascript来检测视频结束播放事件。|unordered-list-item|418329|然后尝试使用JavaScript加载自定义方案请求，UIWebView可以捕获请求。|418330|这些链接可能有助于：|418331|从JavaScript调用iPhone+UIWebView中的Objective+C|ordered-list-item|418332|目标C中的Javascript回调|418333|YouTube+iFrame+API|418334|用一个例子更新：|418335|在UIWebView的代表中，我指出：|418336|#pragma+-+mark+WebView+Delegate
-+(BOOL)webView:(UIWebView+*)webView+shouldStartLoadWithRequest:(NSURLRequest+*)request+navigationType:(UIWebViewNavigationType)navigationType+{


if+(+[[[request+URL]+scheme]+isEqualToString:@"callback"]+)+{

++++NSLog(@"get+callback");

++++return+NO;
}

return+YES;|code-block|syntax|javascript|418337|}|418338|当viewDidLoad加载网页时|418339|[self.webView+loadRequest:[NSURLRequest+requestWithURL:[NSURL+fileURLWithPath:[[NSBundle+++++++mainBundle]+pathForResource:@"youtube"+ofType:@"html"+]]]];|418340|在youtube.html中，我指出：|418341|<html>
<body>

<div+id="player"></div>

<script>

++//+2.+This+code+loads+the+IFrame+Player+API+code+asynchronously.
++var+tag+=+document.createElement('script');
++tag.src+=+"http://www.youtube.com/player_api";
++var+firstScriptTag+=+document.getElementsByTagName('script')[0];
++firstScriptTag.parentNode.insertBefore(tag,+firstScriptTag);

++//+3.+This+function+creates+an+<iframe>+(and+YouTube+player)
++//++++after+the+API+code+downloads.
++var+player;
++function+onYouTubePlayerAPIReady()+{
++++player+=+new+YT.Player('player',+{
++++++height:+'390',
++++++width:+'640',
++++++videoId:+'u1zgFlCw8Aw',
++++++events:+{
++++++++'onReady':+onPlayerReady,
++++++++'onStateChange':+onPlayerStateChange
++++++}
++++});
++}

++//+4.+The+API+will+call+this+function+when+the+video+player+is+ready.
++function+onPlayerReady(event)+{
++++event.target.playVideo();
++}

++//+5.+The+API+calls+this+function+when+the+player's+state+changes.
++//++++The+function+indicates+that+when+playing+a+video+(state=1),
++//++++the+player+should+play+for+six+seconds+and+then+stop.
++var+done+=+false;
++function+onPlayerStateChange(event)+{

++++if+(event.data+==+YT.PlayerState.PLAYING+&&+!done)+{
++++++setTimeout(stopVideo,+6000);
++++++done+=+true;
++++}
++++if+(event.data+==+YT.PlayerState.ENDED)+{
++++++window.location+=+"callback:anything";+//here's+the+key
++++};
++}
++function+stopVideo()+{
++++player.stopVideo();
++}
</script>
</body>
</html>|418342|你可以看到我添加了|418343|if+(event.data+==+YT.PlayerState.ENDED)+{
++++++window.location+=+"callback:anything";
++++};|418344|对于YouTube的iFrame+API演示程序，它捕获播放器的最终播放事件并尝试加载一个带有“回调”方案的请求，然后UIWebView代表就可以捕获它。|418345|可以使用此方法使用JavaScript触发任何事件；|418346|entityMap|0|LINK|mutability|MUTABLE|url|http://tetontech.wordpress.com/2008/08/14/calling-objective-c-from-javascript-in-an-iphone-uiwebview/|1|https://stackoverflow.com/questions/2873899/javascript-in-uiwebview-callback-to-c-objective-c|2|https://developers.google.com/youtube/iframe_api_reference^0|9|9|0|0|0|0|0|16|0|0|0|H|1|0|0|I|2|0|0|0|0|0|1|B|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|1W|8|@$9|1X|A|1Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|1Z|8|@]|D|@]|E|$]]|$1|I|3|J|5|H|7|20|8|@]|D|@]|E|$]]|$1|K|3|L|5|6|7|21|8|@]|D|@]|E|$]]|$1|M|3|N|5|O|7|22|8|@]|D|@$9|23|A|24|1|25]]|E|$]]|$1|P|3|Q|5|O|7|26|8|@]|D|@$9|27|A|28|1|29]]|E|$]]|$1|R|3|S|5|O|7|2A|8|@]|D|@$9|2B|A|2C|1|2D]]|E|$]]|$1|T|3|U|5|6|7|2E|8|@]|D|@]|E|$]]|$1|V|3|W|5|6|7|2F|8|@]|D|@]|E|$]]|$1|X|3|Y|5|Z|7|2G|8|@]|D|@]|E|$10|11]]|$1|12|3|13|5|6|7|2H|8|@]|D|@]|E|$]]|$1|14|3|15|5|6|7|2I|8|@$9|2J|A|2K|B|C]]|D|@]|E|$]]|$1|16|3|17|5|Z|7|2L|8|@]|D|@]|E|$10|11]]|$1|18|3|19|5|6|7|2M|8|@]|D|@]|E|$]]|$1|1A|3|1B|5|Z|7|2N|8|@]|D|@]|E|$10|11]]|$1|1C|3|1D|5|6|7|2O|8|@]|D|@]|E|$]]|$1|1E|3|1F|5|Z|7|2P|8|@]|D|@]|E|$10|11]]|$1|1G|3|1H|5|6|7|2Q|8|@]|D|@]|E|$]]|$1|1I|3|1J|5|6|7|2R|8|@]|D|@]|E|$]]|$1|1K|3|-4|5|6|7|2S|8|@]|D|@]|E|$]]]|1L|$1M|$5|1N|1O|1P|E|$1Q|1R]]|1S|$5|1N|1O|1P|E|$1Q|1T]]|1U|$5|1N|1O|1P|E|$1Q|1V]]]]

<p>No, there's no way to directly get web page event from <code>UIWebView</code>. But we can accomplish this by using Javascript.</p>

<ul>
<li>First you use embed Javascript in your custom HTML, to detect video ending play event.</li>
<li>Then you try to load a scheme-customized request using JavaScript, and UIWebView could catch the request.</li>
</ul>

<p>These links may help:</p>

<ol>
<li><p><a href="http://tetontech.wordpress.com/2008/08/14/calling-objective-c-from-javascript-in-an-iphone-uiwebview/" rel="nofollow noreferrer">Calling Objective-C from JavaScript in an iPhone UIWebView</a></p></li>
<li><p><a href="https://stackoverflow.com/questions/2873899/javascript-in-uiwebview-callback-to-c-objective-c">Javascript callback in Objective-C</a></p></li>
<li><p><a href="https://developers.google.com/youtube/iframe_api_reference" rel="nofollow noreferrer">YouTube iFrame API</a></p></li>
</ol>

<p>updated with an example:</p>

<p>in UIWebView's delegate, i put:</p>

<pre><code>#pragma - mark WebView Delegate
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {


if ( [[[request URL] scheme] isEqualToString:@"callback"] ) {

    NSLog(@"get callback");

    return NO;
}

return YES;
</code></pre>

<p>}</p>

<p>the web page is load when <code>viewDidLoad</code>:</p>

<pre><code>[self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[NSBundle       mainBundle] pathForResource:@"youtube" ofType:@"html" ]]]];
</code></pre>

<p>and in youtube.html i put:
</p>

<pre><code>&lt;html&gt;
&lt;body&gt;
&lt;!-- 1. The &lt;iframe&gt; (and video player) will replace this &lt;div&gt; tag. --&gt;
&lt;div id="player"&gt;&lt;/div&gt;

&lt;script&gt;

  // 2. This code loads the IFrame Player API code asynchronously.
  var tag = document.createElement('script');
  tag.src = "http://www.youtube.com/player_api";
  var firstScriptTag = document.getElementsByTagName('script')[0];
  firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);

  // 3. This function creates an &lt;iframe&gt; (and YouTube player)
  //    after the API code downloads.
  var player;
  function onYouTubePlayerAPIReady() {
    player = new YT.Player('player', {
      height: '390',
      width: '640',
      videoId: 'u1zgFlCw8Aw',
      events: {
        'onReady': onPlayerReady,
        'onStateChange': onPlayerStateChange
      }
    });
  }

  // 4. The API will call this function when the video player is ready.
  function onPlayerReady(event) {
    event.target.playVideo();
  }

  // 5. The API calls this function when the player's state changes.
  //    The function indicates that when playing a video (state=1),
  //    the player should play for six seconds and then stop.
  var done = false;
  function onPlayerStateChange(event) {

    if (event.data == YT.PlayerState.PLAYING &amp;&amp; !done) {
      setTimeout(stopVideo, 6000);
      done = true;
    }
    if (event.data == YT.PlayerState.ENDED) {
      window.location = "callback:anything"; //here's the key
    };
  }
  function stopVideo() {
    player.stopVideo();
  }
&lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;
</code></pre>

<p>you can see i add</p>

<pre><code>if (event.data == YT.PlayerState.ENDED) {
      window.location = "callback:anything";
    };
</code></pre>

<p>to YouTube's iFrame API demo, and it catches the player end playing event and try to load a request with scheme "callback", then the UIWebView Delegate could catch it. </p>

<p>You can use this method to trigger any event using JavaScript;</p>


blocks|key|372568|text|下面是@zero作为一个成熟的类供您使用的奇妙答案：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|372569|@interface+YouTubeWebView+()+<UIWebViewDelegate>

@end


@implementation+YouTubeWebView+

-+(id)initWithFrame:(CGRect)frame
{
++++self+=+[super+initWithFrame:frame];
++++if+(self+==+nil)+return+nil;

++++self.mediaPlaybackRequiresUserAction+=+NO;
++++self.delegate+=+self;
++++self.alpha+=+0;

++++return+self;
}

-+(void)loadVideo:(NSString+*)videoId
{
++++NSString+*filePath+=+[[NSBundle+mainBundle]+pathForResource:@"youtube"+ofType:@"html"];
++++//++++if+(filePath+==+nil)

++++NSError+*error;
++++NSString+*string+=+[NSString+stringWithContentsOfFile:filePath+encoding:NSUTF8StringEncoding+error:&error];
++++//+TODO:+error+check

++++string+=+[NSString+stringWithFormat:string,+videoId];

++++NSData+*htmlData+=+[string+dataUsingEncoding:NSUTF8StringEncoding];
++++//++++if+(htmlData+==+nil)

++++NSString+*documentsDirectoryPath+=+NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,+NSUserDomainMask,+YES)[0];
++++NSString+*targetPath+=+[documentsDirectoryPath+stringByAppendingPathComponent:@"youtube.html"];
++++[htmlData+writeToFile:targetPath+atomically:YES];

++++[self+loadRequest:[NSURLRequest+requestWithURL:[NSURL+fileURLWithPath:targetPath]]];
}

-+(BOOL)webView:(UIWebView+*)webView+shouldStartLoadWithRequest:(NSURLRequest+*)request+navigationType:(UIWebViewNavigationType)navigationType
{
++++if+([[[request+URL]+scheme]+isEqualToString:@"callback"])+{
++++++++[self+removeFromSuperview];

++++++++NSString+*documentsDirectoryPath+=+NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,+NSUserDomainMask,+YES)[0];
++++++++NSString+*targetPath+=+[documentsDirectoryPath+stringByAppendingPathComponent:@"youtube.html"];
++++++++NSError+*error;
++++++++[[NSFileManager+defaultManager]+removeItemAtPath:targetPath+error:&error];
//++++++++TODO:+error+check
++++}

++++return+YES;
}|code-block|syntax|javascript|372570|只需使用这个版本的youtube.html，它有一个替换代码(%25@)来代替视频id：|offset|length|style|CODE|372571|<html>
<head><style>body{margin:0px+0px+0px+44px;}</style></head>
<body>

<div+id="player"></div>

<script>
++//+2.+This+code+loads+the+IFrame+Player+API+code+asynchronously.
++var+tag+=+document.createElement('script');
++tag.src+=+"http://www.youtube.com/player_api";
++var+firstScriptTag+=+document.getElementsByTagName('script')[0];
++firstScriptTag.parentNode.insertBefore(tag,+firstScriptTag);

++//+3.+This+function+creates+an+<iframe>+(and+YouTube+player)
++//++++after+the+API+code+downloads.
++var+player;
++function+onYouTubePlayerAPIReady()+{
++++player+=+new+YT.Player('player',+{
++++++height:+'320',
++++++width:+'480',
++++++videoId:+'%25@',
++++++events:+{
++++++++'onReady':+onPlayerReady,
++++++++'onStateChange':+onPlayerStateChange
++++++}
++++});
++}

++//+4.+The+API+will+call+this+function+when+the+video+player+is+ready.
++function+onPlayerReady(event)+{
++++event.target.playVideo();
++}

++//+5.+The+API+calls+this+function+when+the+player's+state+changes.
++//++++The+function+indicates+that+when+playing+a+video+(state=1),
++//++++the+player+should+play+for+six+seconds+and+then+stop.
++var+done+=+false;
++function+onPlayerStateChange(event)+{
++++if+(event.data+==+YT.PlayerState.PLAYING+&&+!done)+{
++++++setTimeout(stopVideo,+6000);
++++++done+=+true;
++++}
++++if+(event.data+==+YT.PlayerState.ENDED)+{
++++++window.location+=+"callback:anything";+
++++};
++}
++function+stopVideo()+{
++++player.stopVideo();
++}
</script>
</body>
</html>|372572|要实现这一点，我必须克服的唯一主要障碍是将文件作为字符串加载以进行替换。不幸的是，它必须再次编写为一个文件，以便自动播放工作。如果这对于您的用例来说不是必需的，那么可以直接将HTML作为字符串加载到web视图中。|372573|entityMap^0|0|0|V|2|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|T|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|U|8|@$I|V|J|W|K|L]]|9|@]|A|$]]|$1|M|3|N|5|D|7|X|8|@]|9|@]|A|$E|F]]|$1|O|3|P|5|6|7|Y|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|R|$]]

<p>Here is @zero's fantastic answer as a full-fledged class for your use:</p>

<pre><code>@interface YouTubeWebView () &lt;UIWebViewDelegate&gt;

@end


@implementation YouTubeWebView 

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self == nil) return nil;

    self.mediaPlaybackRequiresUserAction = NO;
    self.delegate = self;
    self.alpha = 0;

    return self;
}

- (void)loadVideo:(NSString *)videoId
{
    NSString *filePath = [[NSBundle mainBundle] pathForResource:@"youtube" ofType:@"html"];
    //    if (filePath == nil)

    NSError *error;
    NSString *string = [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:&amp;error];
    // TODO: error check

    string = [NSString stringWithFormat:string, videoId];

    NSData *htmlData = [string dataUsingEncoding:NSUTF8StringEncoding];
    //    if (htmlData == nil)

    NSString *documentsDirectoryPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];
    NSString *targetPath = [documentsDirectoryPath stringByAppendingPathComponent:@"youtube.html"];
    [htmlData writeToFile:targetPath atomically:YES];

    [self loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:targetPath]]];
}

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
    if ([[[request URL] scheme] isEqualToString:@"callback"]) {
        [self removeFromSuperview];

        NSString *documentsDirectoryPath = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)[0];
        NSString *targetPath = [documentsDirectoryPath stringByAppendingPathComponent:@"youtube.html"];
        NSError *error;
        [[NSFileManager defaultManager] removeItemAtPath:targetPath error:&amp;error];
//        TODO: error check
    }

    return YES;
}
</code></pre>

<p>Just use this version of youtube.html, which has a substitution code (<code>%@</code>) in place of the video id:</p>

<pre><code>&lt;html&gt;
&lt;head&gt;&lt;style&gt;body{margin:0px 0px 0px 44px;}&lt;/style&gt;&lt;/head&gt;
&lt;body&gt;
&lt;!-- 1. The &lt;iframe&gt; (and video player) will replace this &lt;div&gt; tag. --&gt;
&lt;div id="player"&gt;&lt;/div&gt;

&lt;script&gt;
  // 2. This code loads the IFrame Player API code asynchronously.
  var tag = document.createElement('script');
  tag.src = "http://www.youtube.com/player_api";
  var firstScriptTag = document.getElementsByTagName('script')[0];
  firstScriptTag.parentNode.insertBefore(tag, firstScriptTag);

  // 3. This function creates an &lt;iframe&gt; (and YouTube player)
  //    after the API code downloads.
  var player;
  function onYouTubePlayerAPIReady() {
    player = new YT.Player('player', {
      height: '320',
      width: '480',
      videoId: '%@',
      events: {
        'onReady': onPlayerReady,
        'onStateChange': onPlayerStateChange
      }
    });
  }

  // 4. The API will call this function when the video player is ready.
  function onPlayerReady(event) {
    event.target.playVideo();
  }

  // 5. The API calls this function when the player's state changes.
  //    The function indicates that when playing a video (state=1),
  //    the player should play for six seconds and then stop.
  var done = false;
  function onPlayerStateChange(event) {
    if (event.data == YT.PlayerState.PLAYING &amp;&amp; !done) {
      setTimeout(stopVideo, 6000);
      done = true;
    }
    if (event.data == YT.PlayerState.ENDED) {
      window.location = "callback:anything"; 
    };
  }
  function stopVideo() {
    player.stopVideo();
  }
&lt;/script&gt;
&lt;/body&gt;
&lt;/html&gt;
</code></pre>

<p>The only major obstacle I had to overcome to implement this was loading the file as a string to make the substitution. Unfortunately it has to be written again as a file for autoplay to work. If thats not necessary for your use case, feel free to load the HTML into the web view directly as a string instead.</p>


blocks|key|418374|text|请参阅：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|418375|类/Reference.html|offset|length|418376|有一个可用的通知iOS+4.0，您可以使用它来检测youtube视频的完成播放|418377|+[[NSNotificationCenter+defaultCenter]+addObserver:self+selector:@selector(youTubePlayed:)+name:AVPlayerItemDidPlayToEndTimeNotification+object:nil];|code-block|syntax|javascript|418378|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/library/ios/#documentation/AVFoundation/Reference/AVPlayerItem_Class/Reference/Reference.html^0|0|0|G|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|V|8|@]|9|@$D|W|E|X|1|Y]]|A|$]]|$1|F|3|G|5|6|7|Z|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|10|8|@]|9|@]|A|$K|L]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|N|$O|$5|P|Q|R|A|$S|T]]]]

<p>please refere to: </p>

<p><a href="https://developer.apple.com/library/ios/#documentation/AVFoundation/Reference/AVPlayerItem_Class/Reference/Reference.html" rel="nofollow">https://developer.apple.com/library/ios/#documentation/AVFoundation/Reference/AVPlayerItem_Class/Reference/Reference.html</a></p>

<p>there is an notification available iOS 4.0 , which you can use to detect youtube video finish playing </p>

<pre><code> [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(youTubePlayed:) name:AVPlayerItemDidPlayToEndTimeNotification object:nil];
</code></pre>


blocks|key|852173|text|这是一个Swift+3的答案|type|unstyled|depth|inlineStyleRanges|entityRanges|data|852174|+++NotificationCenter.default.addObserver(
++++self,
++++selector:+#selector(self.videoEnded),
++++name:+.AVPlayerItemDidPlayToEndTime,
++++object:+nil)


}

func+videoEnded(){
++++print("video+ended")
}|code-block|syntax|javascript|852175|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

<p>Here's a Swift 3 answer</p>

<pre><code>   NotificationCenter.default.addObserver(
    self,
    selector: #selector(self.videoEnded),
    name: .AVPlayerItemDidPlayToEndTime,
    object: nil)


}

func videoEnded(){
    print("video ended")
}
</code></pre>


<p>I'm using <code>UIWebView</code> to play YouTube videos in an iPad.</p>

<p>How can I detect when a YouTube video is finished playing? 
I see the play icon in the status bar and I tried to use <code>MPMusicPlayerController</code> notifications to detect <code>playbackStateDidChange</code>, but it didn't work.</p>

<p>Any ideas how to detect this event? Again, I'm talking about iPad not iPhone.</p>

<p>Thanks in advance.</p>

<p><strong>Update:</strong> </p>

<p>If you use zero solution to detect the end of playing and also want the Youtube video to start automatically set the <code>UIWebView</code> to :</p>

<pre><code>self.webView.mediaPlaybackRequiresUserAction = NO ;
</code></pre>

<p>I just want to clarify about the YouTube frame API:</p>

<blockquote>
  <p>"Important: This is an experimental feature, which means that it might
  change unexpectedly" (08/05/2012)</p>
</blockquote>


Detecting UIWebView finish to play youtube video on iPad

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我正在使用UIWebView在iPad中播放YouTube视频。如何检测YouTube视频何时播放完毕？我在状态栏中看到了play图标，我尝试使用MPMusicPlayerController通知来检测playbackStateDidChange，但是它没有工作。有什么办法能发现这个事件吗？再说一次，我说的是iPad而...

问检测UIWebView完成在iPad上播放youtube视频
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问检测UIWebView完成在iPad上播放youtube视频EN