我想知道是否可以检测到在WKWebView中播放的电影？
此外，我想知道已打开的信息流的确切网址？
答案 0 :(得分：9)
由于这个问题的解决方案需要大量的研究和不同的方法，我想在这里记录，以便其他人遵循我的想法。 如果您只是对最终解决方案感兴趣，请寻找一些精美的标题。
我开始使用的应用程序非常简单。这是一个单一视图应用程序导入WebKit并打开WKWebView一些NSURL：
import UIKit
import WebKit
class ViewController: UIViewController {
var webView: WKWebView!
override func viewDidAppear(animated: Bool) {
webView = WKWebView()
view = webView
let request = NSURLRequest(URL: NSURL(string: "http://tinas-burger.tumblr.com/post/133991473113")!)
webView.loadRequest(request)
}
}
该网址包含受JavaScript保护的视频（种类）。 我还没看过这个视频，这只是我发现的第一个。请记得将
NSAppTransportSecurity和NSAllowsArbitraryLoads添加到Info.plist或者你会看到一页空白。
WKNavigationDelegate不会通知您正在播放的视频。因此，设置webView.navigationDelegate = self并实施协议不会为您带来理想的结果。
我认为必须有像SomeVideoPlayerDidOpen这样的事件。不幸的是没有，但它可能有一个SomeViewDidOpen事件，所以我开始检查视图层次结构：
UIWindow
UIWindow
WKWebView
WKScrollView
...
...
UIWindow
UIWindow
UIView
AVPlayerView
UITransitionView
UIView
UIView
UIView
...
UIView
...
AVTouchIgnoringView
...
正如预期的那样，会有一个额外的UIWindow添加可能有一个事件，而且它确实有它！
我通过添加一个新观察者来扩展viewDidAppear:：
NSNotificationCenter.defaultCenter().addObserver(self, selector: "windowDidBecomeVisible:", name: UIWindowDidBecomeVisibleNotification, object: nil)
并添加了相应的方法：
func windowDidBecomeVisible(notification: NSNotification) {
for mainWindow in UIApplication.sharedApplication().windows {
for mainWindowSubview in mainWindow.subviews {
// this will print:
// 1: `WKWebView` + `[WKScrollView]`
// 2: `UIView` + `[]`
print("\(mainWindowSubview) \(mainWindowSubview.subviews)")
}
正如我们预期的那样，它会返回我们之前检查过的视图层次结构。但遗憾的是，AVPlayerView似乎将在稍后创建。
如果您信任您的应用程序，它打开的唯一UIWindow是媒体播放器，那么您现在已经完成了。但是这个解决方案不会让我晚上睡觉，所以让我们更深入......
我们需要收到关于AVPlayerView被添加到此无名UIView的通知。很明显，AVPlayerView必须是UIView的子类，但由于Apple没有正式记录，我检查了iOS Runtime Headers for AVPlayerView，它确实是 a {{ 1}}。
现在我们知道UIView是AVPlayerView的子类，它可能会通过调用UIView添加到无名UIView。因此，我们必须收到有关添加的视图的通知。遗憾的是addSubview:没有提供观察此事件的事件。但它 调用一个名为UIView的方法，这可能非常方便。
所以，让我们检查一下didAddSubview:是否会在我们的应用程序中的某处添加并发送通知：
AVPlayerView现在我们可以观察通知并收到相应的事件：
let originalDidAddSubviewMethod = class_getInstanceMethod(UIView.self, "didAddSubview:")
let originalDidAddSubviewImplementation = method_getImplementation(originalDidAddSubviewMethod)
typealias DidAddSubviewCFunction = @convention(c) (AnyObject, Selector, UIView) -> Void
let castedOriginalDidAddSubviewImplementation = unsafeBitCast(originalDidAddSubviewImplementation, DidAddSubviewCFunction.self)
let newDidAddSubviewImplementationBlock: @convention(block) (AnyObject!, UIView) -> Void = { (view: AnyObject!, subview: UIView) -> Void in
castedOriginalDidAddSubviewImplementation(view, "didAddsubview:", subview)
if object_getClass(view).description() == "AVPlayerView" {
NSNotificationCenter.defaultCenter().postNotificationName("PlayerWillOpen", object: nil)
}
}
let newDidAddSubviewImplementation = imp_implementationWithBlock(unsafeBitCast(newDidAddSubviewImplementationBlock, AnyObject.self))
method_setImplementation(originalDidAddSubviewMethod, newDidAddSubviewImplementation)
由于NSNotificationCenter.defaultCenter().addObserver(self, selector: "playerWillOpen:", name: "PlayerWillOpen", object: nil)
func playerWillOpen(notification: NSNotification) {
print("A Player will be opened now")
}
不会被删除但只被解除分配，我们将不得不重写我们的代码并向AVPlayerView注入一些通知。这样我们就可以获得尽可能多的通知，例如：AVPlayerViewController和PlayerWillAppear：
PlayerWillDisappear现在我们可以观察这两个通知并且很好：
let originalViewWillAppearMethod = class_getInstanceMethod(UIViewController.self, "viewWillAppear:")
let originalViewWillAppearImplementation = method_getImplementation(originalViewWillAppearMethod)
typealias ViewWillAppearCFunction = @convention(c) (UIViewController, Selector, Bool) -> Void
let castedOriginalViewWillAppearImplementation = unsafeBitCast(originalViewWillAppearImplementation, ViewWillAppearCFunction.self)
let newViewWillAppearImplementationBlock: @convention(block) (UIViewController!, Bool) -> Void = { (viewController: UIViewController!, animated: Bool) -> Void in
castedOriginalViewWillAppearImplementation(viewController, "viewWillAppear:", animated)
if viewController is AVPlayerViewController {
NSNotificationCenter.defaultCenter().postNotificationName("PlayerWillAppear", object: nil)
}
}
let newViewWillAppearImplementation = imp_implementationWithBlock(unsafeBitCast(newViewWillAppearImplementationBlock, AnyObject.self))
method_setImplementation(originalViewWillAppearMethod, newViewWillAppearImplementation)
let originalViewWillDisappearMethod = class_getInstanceMethod(UIViewController.self, "viewWillDisappear:")
let originalViewWillDisappearImplementation = method_getImplementation(originalViewWillDisappearMethod)
typealias ViewWillDisappearCFunction = @convention(c) (UIViewController, Selector, Bool) -> Void
let castedOriginalViewWillDisappearImplementation = unsafeBitCast(originalViewWillDisappearImplementation, ViewWillDisappearCFunction.self)
let newViewWillDisappearImplementationBlock: @convention(block) (UIViewController!, Bool) -> Void = { (viewController: UIViewController!, animated: Bool) -> Void in
castedOriginalViewWillDisappearImplementation(viewController, "viewWillDisappear:", animated)
if viewController is AVPlayerViewController {
NSNotificationCenter.defaultCenter().postNotificationName("PlayerWillDisappear", object: nil)
}
}
let newViewWillDisappearImplementation = imp_implementationWithBlock(unsafeBitCast(newViewWillDisappearImplementationBlock, AnyObject.self))
method_setImplementation(originalViewWillDisappearMethod, newViewWillDisappearImplementation)
我花了几个小时挖掘一些iOS运行时标题来猜测我在哪里可以找到指向视频的URL，但我无法找到它。当我深入研究WebKit本身的一些源文件时，我不得不放弃并接受没有简单方法来做这件事，虽然我相信它隐藏在某个地方并且可以到达，但很可能只是付出了很多努力。
答案 1 :(得分：6)
我尝试将一些用户脚本添加（注入）到WKWebView，这种方式比方法调整更安全：
以下是相关代码：
let contentController = WKUserContentController()
if let jsSource = NSBundle.mainBundle().URLForResource("video_play_messenger", withExtension: "js"),
let jsSourceString = try? String(contentsOfURL: jsSource) {
let userScript = WKUserScript(source: jsSourceString, injectionTime: .AtDocumentEnd, forMainFrameOnly: true)
contentController.addUserScript(userScript)
contentController.addScriptMessageHandler(self, name: "callbackHandler")
}
let webConfiguration = WKWebViewConfiguration()
webConfiguration.userContentController = contentController
webView = WKWebView(frame: CGRect.zero, configuration: webConfiguration)
let request = NSURLRequest(URL: NSURL(string: "URL_FOR_VIDEO")!)
webView.loadRequest(request)
对于WKWebView的控制器，符合WKScriptMessageHandler并实现此方法：
func userContentController(userContentController: WKUserContentController, didReceiveScriptMessage message: WKScriptMessage) {
if message.name == "callbackHandler" {
if let messageString = message.body as? String where messageString == "VideoIsPlaying" {
// Vide is being played
}
}
}
将video_play_messenger.js添加到您的项目中：
function videoTags() {
return document.getElementsByTagName("video");
}
function setupVideoPlayingHandler() {
try {
var videos = videoTags()
for (var i = 0; i < videos.length; i++) {
videos.item(i).onplaying = function() {
webkit.messageHandlers.callbackHandler.postMessage("VideoIsPlaying");
}
}
} catch (error) {
console.log(error);
}
}
function setupVidePlayingListener() {
// If we have video tags, setup onplaying handler
if (videoTags().length > 0) {
setupVideoPlayingHandler();
return
}
// Otherwise, wait for 100ms and check again.
setTimeout(setupVidePlayingListener, 100);
}
setupVidePlayingListener();
参考：http://www.kinderas.com/technology/2014/6/15/wkwebview-and-javascript-in-ios-8-using-swift