我正在使用UIWebView 在 iPad 上播放 YouTube 视频。
如何检测 YouTube 视频何时播放完毕？
我在状态栏中看到播放图标，我尝试使用MPMusicPlayerController 通知来检测playbackStateDidChange，但没有成功。
任何想法如何检测此事件？再说一次，我说的是 iPad 而不是 iPhone。
提前致谢。
更新：
如果您使用零解决方案来检测播放结束并且还希望 Youtube 视频自动开始，请将 UIWebView 设置为：
self.webView.mediaPlaybackRequiresUserAction = NO ;
我只是想澄清一下 YouTube 框架 API：
“重要提示：这是一个实验性功能，这意味着它可能 意外改变”（08/05/2012）
【问题讨论】：
标签： objective-c ipad youtube uiwebview
不，无法直接从UIWebView 获取网页事件。但是我们可以通过使用 Javascript 来实现。
这些链接可能会有所帮助：
更新了一个例子：
在 UIWebView 的委托中，我输入：
#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;
}
网页在viewDidLoad时加载：
[self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"youtube" ofType:@"html" ]]]];
在 youtube.html 中我输入：
<html>
<body>
<!-- 1. The <iframe> (and video player) will replace this <div> tag. -->
<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>
你可以看到我添加
if (event.data == YT.PlayerState.ENDED) {
window.location = "callback:anything";
};
到 YouTube 的 iFrame API 演示，它捕获播放器结束播放事件并尝试使用方案“回调”加载请求，然后 UIWebView 委托可以捕获它。
您可以使用此方法通过 JavaScript 触发任何事件；
【讨论】：
这里是 @zero 的绝妙答案，作为一个成熟的课程供您使用：
@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;
}
只需使用这个版本的 youtube.html，它有一个替换代码 (%@) 代替视频 ID：
<html>
<head><style>body{margin:0px 0px 0px 44px;}</style></head>
<body>
<!-- 1. The <iframe> (and video player) will replace this <div> tag. -->
<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: '%@',
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>
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，它必须再次写入文件才能自动播放。如果您的用例不需要这样做，请随意将 HTML 作为字符串直接加载到 Web 视图中。
【讨论】：
请参考：
iOS 4.0 有一个可用的通知，您可以使用它来检测 youtube 视频播放完毕
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(youTubePlayed:) name:AVPlayerItemDidPlayToEndTimeNotification object:nil];
【讨论】：
这是一个 Swift 3 答案
NotificationCenter.default.addObserver(
self,
selector: #selector(self.videoEnded),
name: .AVPlayerItemDidPlayToEndTime,
object: nil)
}
func videoEnded(){
print("video ended")
}
【讨论】：