Question

试图将WKWebview附加到UIApplication.shared.keywindow视图层次结构。当应用程序进入后台时，API会永远运行。但是当再次打开应用程序时，我遇到了这个问题：

[错误]无法加载资源：操作无法完成。软件导致连接中止

'var gOffscreenView：UIView？ =零

func retainWKWebViewOffscreen(webView: WKWebView) {
    if (gOffscreenView == nil) {
        gOffscreenView = constructOffscreenView()
    }
    gOffscreenView?.addSubview(self.webView)
}

func cleanUpOffscreenView() {
    if (gOffscreenView?.subviews.count == 0) {
        gOffscreenView?.removeFromSuperview()
        gOffscreenView = nil
    }
}

func constructOffscreenView() -> UIView {
    let view = UIView(frame: CGRect.zero)
    view.clipsToBounds = true

    let appWindow = UIApplication.shared.keyWindow
    appWindow?.addSubview(view)

    return view
}

override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
    if (keyPath == self.kMoPubFrameKeyPathString) {
        self.webView.frame = CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: self.view.frame.size.height)
    } else {
        self.webView.frame = self.view.frame
    }
}

@objc func keepWebViewRunning(_ notification: NSNotification) {
    self.webView.frame = CGRect(x: 0, y: 0, width: 0, height: 0)
    self.retainWKWebViewOffscreen(webView: self.webView)
}

@objc func remove(_ notification: NSNotification) {
    self.webView.frame = CGRect(x: 0, y: 0, width: self.view.frame.size.width, height: self.view.frame.size.height)
    self.view.backgroundColor = UIColor.yellow
    self.view.addSubview(webView)
}`

我点击了此链接https://github.com/mopub/mopub-ios-sdk/blob/master/MoPubSDK/Internal/HTML/MPWebView.m

我还尝试设置计时器以调用虚拟javascript函数，以保持wkwebview不会进入空闲模式，但存在相同的问题。

WKWebView到后台时停止调用Javascript

0 个答案: