12

我有一个 UIWebView 子类，用于播放 youtube 和本地视频。在 iOS6 下完美运行。在升级到 iOS7 时，我遇到了一个我真的不知道从哪里开始的问题。虽然子类似乎仍然可以在 iOS7 模拟器上播放 youtube 和本地视频，但当我在设备上播放 youtube 时，我会记录以下消息：

Sep 26 10:17:27 JRR-IPad SVOx[558] <Error>: CGContextSaveGState: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context  and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update.

Sep 26 10:17:27 JRR-IPad SVOx[558] <Error>: CGContextSetBlendMode: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context  and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update.

Sep 26 10:17:27 JRR-IPad SVOx[558] <Error>: CGContextSetAlpha: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context  and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update.

Sep 26 10:17:27 JRR-IPad SVOx[558] <Error>: CGContextTranslateCTM: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context  and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update.

Sep 26 10:17:27 JRR-IPad SVOx[558] <Error>: CGContextScaleCTM: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context  and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update. 

Sep 26 10:17:27 JRR-IPad SVOx[558] <Error>: CGContextGetCTM: invalid context 0x0.
This is a serious error. This application, or a library it uses, is using an invalid context  and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update.

Sep 26 10:17:27 JRR-IPad SVOx[558] <Error>: CGContextDrawImage: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context  and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update.

Sep 26 10:17:27 JRR-IPad SVOx[558] <Error>: CGContextGetCTM: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context  and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update.

===

这只会发生在设备上，不会发生在模拟器上，iOS6下也不会发生。我在这里看到一些帖子讨论了 beta 上各种类的类似问题，但我没有看到关于 iOS7 发布版本的评论。

我没有在我的代码中使用任何这些方法，因此这些消息源自库中。

任何人？TIA。

4

5 回答 5

4

使用它，您可以在视图中运行 youtube 视频..

UIWebView *videoView = [[UIWebView alloc] initWithFrame:self.view.bounds];

    NSString *strparse = [NSString stringWithFormat:@"http://www.youtube.com/watch?v=%@",youtubeVideoId];
    NSRange rng = [strparse rangeOfString: @"watch?v="];
    strparse = [strparse substringFromIndex:rng.location];
    rng = [strparse rangeOfString:@"&feature="];


    if (rng.length >0)
    {
        strparse = [strparse substringToIndex:rng.location];
    }
    strparse = [strparse stringByReplacingOccurrencesOfString:@"watch?v=" withString:@""];
    //http://www.youtube.com/embed/FJkiwbqlSy0
    NSString *youTubeVideoHTML =[NSString stringWithFormat:@"<!DOCTYPE html><html><head><style>body{margin:0px 0px 0px 0px; background:#1111}</style></head> <body> <div id=\"player\"></div> <script> var tag = document.createElement('script'); tag.src = \"http://www.youtube.com/player_api\"; var firstScriptTag = document.getElementsByTagName('script')[0]; firstScriptTag.parentNode.insertBefore(tag, firstScriptTag); var player; function onYouTubePlayerAPIReady() { player = new YT.Player('player', { width:'%0.0f', height:'%0.0f', videoId:'%@', events: { 'onReady': onPlayerReady, 'onStateChange': onPlayerStateChange } });} function onPlayerReady(event) { event.target.playVideo(); } function onPlayerStateChange(event) {if(event.data === 0) {   event.target.destroy(); }}  </script> </body> </html>",0.0, 0.0,youtubeVideoId];


    videoView.scalesPageToFit=NO;
    videoView.mediaPlaybackRequiresUserAction=NO;
    videoView.backgroundColor = [UIColor clearColor];
    videoView.opaque= NO;


    [SharedObj showLoadingWithText:@""];

    [videoView loadHTMLString:youTubeVideoHTML baseURL:[NSURL URLWithString:[NSString stringWithFormat:@"http://www.youtube.com/watch?v=%@",youtubeVideoId]]];


    [self.view addSubview:videoView];
于 2014-08-25T11:33:43.253 回答
1

这是IOS7中的测试代码，它工作正常

[self embedYouTube:[self getYTUrlStr:@"https://www.youtube.com/watch?v=Zq4o_Ca14aw"] frame:CGRectMake(0,40,self.view.frame.size.width, self.view.frame.size.height-40)];


- (NSString*)getYTUrlStr:(NSString*)url
{
    if (url == nil)
        return nil;

    NSString *retVal = [url stringByReplacingOccurrencesOfString:@"watch?v=" withString:@"v/"];

    NSRange pos=[retVal rangeOfString:@"version"];
    if(pos.location == NSNotFound)
    {
        retVal = [retVal stringByAppendingString:@"?version=3&hl=en_EN"];
    }
    return retVal;
}



- (void)embedYouTube:(NSString*)url frame:(CGRect)frame {

    NSString* embedHTML = @"\
    <html><head>\
    <style type=\"text/css\">\
    body {\
    background-color: transparent;\
    color: white;\
    }\
    </style>\
    </head><body style=\"margin:0\">\
    <embed id=\"yt\" src=\"%@\" type=\"application/x-shockwave-flash\" \
    width=\"%0.0f\" height=\"%0.0f\"></embed>\
    </body></html>";
    NSString* html = [NSString stringWithFormat:embedHTML, url, frame.size.width, frame.size.height];
    if(videoView == nil) {
        videoView = [[UIWebView alloc] initWithFrame:frame];
        videoView.delegate=self;
        [self.view addSubview:videoView];
    }


    videoView.mediaPlaybackAllowsAirPlay=YES;
    videoView.allowsInlineMediaPlayback=YES;
    [videoView loadHTMLString:html baseURL:nil];

}
于 2013-10-25T05:00:26.290 回答
0

我在我的应用程序中使用了以下方式，它可以在 iOS6 和 iOS 7 中运行。可能对你有用。

NSString *youTubeID = [self extractYoutubeID:url];   // url is youtube url 
NSString *embedHTML =[NSString stringWithFormat:@"\
                          <html><head>\
                          <style type=\"text/css\">\
                          body {\
                          background-color: #666666;\
                          padding:%f %f %f %f;\
                          color: blue;\
                          }\
                          </style>\
                          </head><body style=\"margin:0\">\
                          <iframe height=\"%f\" width=\"%f\" title=\"YouTube Video\" class=\"youtube-player\" src=\"http://www.youtube.com/embed/%@\" ></iframe>\
                          </body></html>",paddingTop,paddingRight,paddingBottom,paddingLeft,videoHeight,videoWidth,youTubeID];
[self.webView loadHTMLString:embedHTML baseURL:nil];




- (NSString *)extractYoutubeID:(NSString *)youtubeURL
    {
        //NSLog(@"youtube  %@",youtubeURL);
        NSError *error = NULL;
        NSString *regexString = @"(?<=v(=|/))([-a-zA-Z0-9_]+)|(?<=youtu.be/)([-a-zA-Z0-9_]+)";
        NSRegularExpression *regex = [NSRegularExpression regularExpressionWithPattern:regexString options:NSRegularExpressionCaseInsensitive error:&error];
        NSRange rangeOfFirstMatch = [regex rangeOfFirstMatchInString:youtubeURL options:0 range:NSMakeRange(0, [youtubeURL length])];
        if(!NSEqualRanges(rangeOfFirstMatch, NSMakeRange(NSNotFound, 0)))
        {
            NSString *substringForFirstMatch = [youtubeURL substringWithRange:rangeOfFirstMatch];
            return substringForFirstMatch;
        }
        return nil;
    }
于 2013-12-20T13:17:54.240 回答
0

尝试这个：

NSString* videoUrl = @"//www.youtube.com/embed/Of_hjbYCx4Y";
if([videoUrl hasPrefix:@"//"]) {
    videoUrl = [NSString stringWithFormat:@"https:%@", videoUrl]; // or http
    // if its a local file add proper scheme like "file:///"
}
NSString* iframeWidth = @"100%";
NSString* iframeHeight = @"240px";
NSString *iframeHTML =[NSString stringWithFormat:@"<iframe width=\"%@\" height=\"%@\" src=\"%@\" frameborder=\"0\" allowfullscreen></iframe>", iframeWidth, iframeHeight, videoUrl];
// you can directly use iframeHTML below or u can wrap it up in body and span tags and then use it if u need to add any extra stuff or customize the page itself
[videoWebView loadHTMLString:htmlString baseURL:nil];

确保两件事：视频 url 以http（正确的方案）开头，如果你在 url 中没有它，则用embed/替换/watch?v= 。检查此处给出的其他答案以了解如何执行此操作。希望能帮助到你。

于 2014-02-28T14:57:13.777 回答
0

YouTube 提供了一个框架，使我们免于直接使用网络视图的麻烦。该框架位于：https ://github.com/youtube/youtube-ios-player-helper

您需要做的就是创建一个 YTPlayerView 视图，使用您喜欢的约束将其添加到视图层次结构中并加载视频。像这样：

    youTubePlayer = YTPlayerView()
    youTubePlayer!.translatesAutoresizingMaskIntoConstraints = false
    contentView.addSubview(youTubePlayer!)
    youTubePlayer!.pinAllAnchors(to: contentView)
    youTubePlayer!.load(withVideoId: url.youTubeVideoId()!)

请注意 pinAllAnchors 和 youTubeVideoId 是我创建的助手。它们不是框架的一部分。

于 2017-07-14T13:00:10.003 回答