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？
我在状态栏中看到了播放图标，并尝试使用MPMusicPlayerController通知来检测playbackStateDidChange，但它无效。
有关如何检测此事件的任何想法？我再次谈论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视频开始自动将UIWebView设置为：
self.webView.mediaPlaybackRequiresUserAction = NO ;
我只是想澄清一下YouTube框架API：
“重要：这是一个实验性功能，这意味着可能 意外改变“（08/05/2012）
答案 0 :(得分：15)
不，没有办法从UIWebView直接获取网页事件。但我们可以通过使用Javascript来实现这一目标。
这些链接可能有所帮助：
更新了一个例子：
在UIWebView的委托中，我把：
#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;
}
viewDidLoad时加载网页：
[self.webView loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:@"youtube" ofType:@"html" ]]]];
在youtube.html中我放了：
<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 Delegate可以捕获它。
您可以使用此方法使用JavaScript触发任何事件;
答案 1 :(得分：11)
请参阅：
iOS 4.0提供了一个通知，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];
答案 2 :(得分：3)
这是@ zero的绝佳答案，作为一个完整的课程供您使用：
@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;
}
只需使用此版本的youtube.html，其中包含替换代码（%@）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>
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，它必须再次写为自动播放文件才能工作。如果您的用例不需要这些，请随意将HTML直接作为字符串加载到Web视图中。
答案 3 :(得分：0)
这是Swift 3的回答
NotificationCenter.default.addObserver(
self,
selector: #selector(self.videoEnded),
name: .AVPlayerItemDidPlayToEndTime,
object: nil)
}
func videoEnded(){
print("video ended")
}