WKWebView音视频媒体播放处理

左方

1. 对WKWebViewConfiguration进行设置。

实现媒体文件可以自动播放、使用内嵌HTML5播放等功能
使用这个测试网址
// 初始化配置对象WKWebViewConfiguration *configuration = [[WKWebViewConfiguration alloc] init];// 默认是NO，这个值决定了用内嵌HTML5播放视频还是用本地的全屏控制configuration.allowsInlineMediaPlayback = YES;// 自动播放, 不需要用户采取任何手势开启播放// WKAudiovisualMediaTypeNone 音视频的播放不需要用户手势触发, 即为自动播放configuration.mediaTypesRequiringUserActionForPlayback = WKAudiovisualMediaTypeNone;configuration.allowsAirPlayForMediaPlayback = YES;configuration.allowsPictureInPictureMediaPlayback = YES;    self.webView = [[WKWebView alloc] initWithFrame:self.view.bounds configuration:configuration];self.webView.navigationDelegate = self;NSURL *url =[NSURL URLWithString:@"测试网址"];[self.webView loadRequest:[NSURLRequest requestWithURL:url]];[self.view addSubview:self.webView];由于H5的video未设置autoplay、playsinline属性。我们需自己注入，才能实现效果。
NSString *jSString = @"document.getElementsByTagName('video')[0].setAttribute('playsinline','');";NSString *jSString2 = @"document.getElementsByTagName('video')[0].autoplay=true;";//用于进行JavaScript注入WKUserScript *wkUScript = [[WKUserScript alloc] initWithSource:jSString injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];WKUserScript *wkUScript2 = [[WKUserScript alloc] initWithSource:jSString2 injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];[configuration.userContentController addUserScript:wkUScript];[configuration.userContentController addUserScript:wkUScript2];2. 监听网页内播放器的回调

可以使用两种办法。
2.1 利用HTML5 Audio/Video 事件

HTML5 Audio/Video 事件代码可以由H5同事完成，也可以由App端注入。
注入代码如下：
NSString *jSString3 = @"document.getElementsByTagName('video')[0].addEventListener('canplay', function(e) {window.webkit.messageHandlers.readytoplay.postMessage(\"canplay\");})";NSString *jSString4 = @"document.getElementsByTagName('video')[0].addEventListener('pause', function(e) {window.webkit.messageHandlers.pause.postMessage(\"pause\");})";NSString *jSString5 = @"document.getElementsByTagName('video')[0].addEventListener('play', function(e) {window.webkit.messageHandlers.play.postMessage(\"play\");})";NSString *jSString6 = @"document.getElementsByTagName('video')[0].addEventListener('ended', function(e) {window.webkit.messageHandlers.ended.postMessage(\"ended\");})";WKUserScript *wkUScript3 = [[WKUserScript alloc] initWithSource:jSString3 injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];[configuration.userContentController addUserScript:wkUScript3];WKUserScript *wkUScript4 = [[WKUserScript alloc] initWithSource:jSString4 injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];[configuration.userContentController addUserScript:wkUScript4];WKUserScript *wkUScript5 = [[WKUserScript alloc] initWithSource:jSString5 injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];[configuration.userContentController addUserScript:wkUScript5];WKUserScript *wkUScript6 = [[WKUserScript alloc] initWithSource:jSString6 injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];[configuration.userContentController addUserScript:wkUScript6];App端接收js的代码如下：
需遵守WKScriptMessageHandler协议
@interface ViewController () @end再为WKWebViewConfiguration添加协议
//添加一个协议[configuration.userContentController addScriptMessageHandler:self name:@"readytoplay"];[configuration.userContentController addScriptMessageHandler:self name:@"play"];[configuration.userContentController addScriptMessageHandler:self name:@"pause"];[configuration.userContentController addScriptMessageHandler:self name:@"ended"];使用以下方法即可获取播放器事件
#pragma mark - WKScriptMessageHandler//! WKWebView收到ScriptMessage时回调此方法- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message {    if ([message.name caseInsensitiveCompare:@"readytoplay"] == NSOrderedSame) {        NSLog(@"video is readytoplay");    }    if ([message.name caseInsensitiveCompare:@"play"] == NSOrderedSame) {        NSLog(@"video is play");    }    if ([message.name caseInsensitiveCompare:@"pause"] == NSOrderedSame) {        NSLog(@"video is pause");    }    if ([message.name caseInsensitiveCompare:@"ended"] == NSOrderedSame) {        NSLog(@"video is ended");    }}参考资料：
HTML 音频/视频参考手册
video 属性和事件用法大全
iOS与JS交互之WKWebView-WKScriptMessageHandler协议
2.2 还有一种是App可自己实现的,使用AVAudioSession进行监听：

使用AVAudioSession监听，必须用到AVAudioSessionCategoryOptionMixWithOthers。这样会导致切换别的音视频App不会打断播放器。例如网易云音乐、bilibili。
手机来电会打断播放器。
NSError *sessionError = nil;[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryPlayback                                 withOptions:AVAudioSessionCategoryOptionMixWithOthers                                       error:&sessionError];[[AVAudioSession sharedInstance] setActive:YES error:nil];[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(audioSessionSilenceSecondaryAudioHint:)                                             name:AVAudioSessionSilenceSecondaryAudioHintNotification                                           object:[AVAudioSession sharedInstance]];- (void)audioSessionSilenceSecondaryAudioHint:(NSNotification *)notification{    NSDictionary *userInfo = notification.userInfo;    NSLog(@"audioSessionSilenceSecondaryAudioHint  %@",userInfo);}开始播放输出：
2021-04-01 15:22:31.302248+0800 webViewPlayMedia[18078:2811391] audioSessionSilenceSecondaryAudioHint  {    AVAudioSessionSilenceSecondaryAudioHintTypeKey = 1;结束播放输出：
2021-04-01 15:22:31.382646+0800 webViewPlayMedia[18078:2811391] audioSessionSilenceSecondaryAudioHint  {    AVAudioSessionSilenceSecondaryAudioHintTypeKey = 0;3. 获取视频播放地址，使用自定义播放器进行播放

- (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecified WKNavigation *)navigation {    NSLog(@"WKPhoneWebView didFinishNavigation");        NSString *JsStr = @"(document.getElementsByTagName(\"video\")[0]).src";    [self.webView evaluateJavaScript:JsStr completionHandler:^(id _Nullable response, NSError * _Nullable error) {        if(![response isEqual:[NSNull null]] && response != nil){            //截获到视频地址了            NSLog(@"response == %@",response);        }else{            //没有视频链接        }    }];}4. 坑

4.1 播放视频，会有ERROR提示：

2021-04-01 09:34:57.361477+0800 webViewPlayMedia[17109:2655981] [assertion] Error acquiring assertion: 2021-04-01 09:34:57.361610+0800 webViewPlayMedia[17109:2655981] [ProcessSuspension] 0x1043dc990 - ProcessAssertion: Failed to acquire RBS MediaPlayback assertion 'WebKit Media Playback' for process with PID 17110, error: Error Domain=RBSAssertionErrorDomain Code=3 "Required client entitlement is missing" UserInfo={RBSAssertionAttribute=, NSLocalizedFailureReason=Required client entitlement is missing}但是设置了background属性了，依然无法解除，但是不影响播放。
这个问题在https://stackoverflow.com/questions/66493177/required-client-entitlement-is-missing-in-wkwebview亦有提出，但是没有解决方案。
4.2 iOS13.2 13.3系统手机会在加载WKWebView时会连续报错：

2021-04-01 15:55:11.083253+0800 webViewPlayMedia[342:59346] [Process] kill() returned unexpected error 1在该系统版本下，WKWebView使用配置WKWebViewConfiguration，会无法播放。
资料：收到控制台警告：当我在iOS13.2中加载WKWebView时，[Process] kill() returned unexpected error 1
该错误已在13.4版本中修复。

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