如何自动调整WKWebView的内容？

要在Swift中自动缩放一个优秀的旧WebView中的网页，我只需要：

var w:UIWebView w.scalesPageToFit=true 

我无法findWKWebView的等效方法，而且网页在我的应用程序中显得太大了。 我如何自动调整WKWebView的内容？

我正在使用Xcode 7和Swift

Answer 1

这是我的解决scheme：

 extension WKWebView { private struct key { static let scale = unsafeBitCast(Selector("scalesPageToFit"), UnsafePointer<Void>.self) } private var sourceOfUserScript: String { return "(function(){\n" + " var head = document.getElementsByTagName('head')[0];\n" + " var nodes = head.getElementsByTagName('meta');\n" + " var i, meta;\n" + " for (i = 0; i < nodes.length; ++i) {\n" + " meta = nodes.item(i);\n" + " if (meta.getAttribute('name') == 'viewport') break;\n" + " }\n" + " if (i == nodes.length) {\n" + " meta = document.createElement('meta');\n" + " meta.setAttribute('name', 'viewport');\n" + " head.appendChild(meta);\n" + " } else {\n" + " meta.setAttribute('backup', meta.getAttribute('content'));\n" + " }\n" + " meta.setAttribute('content', 'width=device-width, user-scalable=no');\n" + "})();\n" } var scalesPageToFit: Bool { get { return objc_getAssociatedObject(self, key.scale) != nil } set { if newValue { if objc_getAssociatedObject(self, key.scale) != nil { return } let time = WKUserScriptInjectionTime.AtDocumentEnd let script = WKUserScript(source: sourceOfUserScript, injectionTime: time, forMainFrameOnly: true) configuration.userContentController.addUserScript(script) objc_setAssociatedObject(self, key.scale, script, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC) if URL != nil { evaluateJavaScript(sourceOfUserScript, completionHandler: nil) } } else if let script = objc_getAssociatedObject(self, key.scale) as? WKUserScript { objc_setAssociatedObject(self, key.scale, nil, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC) configuration.userContentController.removeUserScript(script) if URL != nil { let source = "(function(){\n" + " var head = document.getElementsByTagName('head')[0];\n" + " var nodes = head.getElementsByTagName('meta');\n" + " for (var i = 0; i < nodes.length; ++i) {\n" + " var meta = nodes.item(i);\n" + " if (meta.getAttribute('name') == 'viewport' && meta.hasAttribute('backup')) {\n" + " meta.setAttribute('content', meta.getAttribute('backup'));\n" + " meta.removeAttribute('backup');\n" + " }\n" + " }\n" + "})();" evaluateJavaScript(source, completionHandler: nil) } } } } } extension WKUserContentController { public func removeUserScript(script: WKUserScript) { let scripts = userScripts removeAllUserScripts() scripts.forEach { if $0 != script { self.addUserScript($0) } } } } 

Answer 2

这对我来说，如果有一个更简单或更清洁的方式，让我们知道。 在这个例子中，每当设备的屏幕方向改变时，我调整WKWebview的大小，把代码放在你的ViewController中。 在我的情况下，我加载的网站可能已经在browswer自动自动化，并与此代码，它也将resize内WKWebView：

  onViewDidLoad{ // other initialization code here... screenWidth=UIScreen.mainScreen().bounds.width screenHeight=UIScreen.mainScreen().bounds.height } var screenWidth:CGFloat=0 var screenHeight:CGFloat=0 func resizeAccordingToOrientation(){ if UIDevice.currentDevice().orientation.isLandscape.boolValue { var frame:CGRect = webView!.frame; frame.size = CGSizeMake(screenHeight, screenWidth-getNavBarHeight())//w,h !!! frame.origin.x=0 frame.origin.y=getNavBarHeight() webView!.frame = frame; //print("Origin x: "+(webView?.frame.origin.x.description)!+" , "+(webView?.frame.origin.y.description)!) } else{ var frame:CGRect = webView!.frame; frame.size = CGSizeMake(screenWidth,screenHeight-getNavBarHeight()-self.navigationController!.navigationBar.frame.origin.y) frame.origin.x=0 frame.origin.y=getNavBarHeight()+self.navigationController!.navigationBar.frame.origin.y webView!.frame = frame; //print("Origin x: "+(webView?.frame.origin.x.description)!+" , "+(webView?.frame.origin.y.description)!) } } func getNavBarHeight() -> CGFloat{ return self.navigationController!.navigationBar.frame.size.height }