WKWebView音视频媒体播放处理

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

// 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

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 () <WKNavigationDelegate,WKScriptMessageHandler>
@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

注意：解决WKWebView中WKScriptMessageHandler方法引起内存不释放问题，请参考我的另一篇文章