Question

我正在更新我的iOS应用，将UIWebView替换为WKWebView。但是我不明白如何使用WKWebView实现相同的行为。使用UIWebView我使用scalesPageToFit来确保网页显示的大小与屏幕尺寸相同（以便在不滚动的情况下显示为全屏）。

我在网络上找到了解决方案，但它不起作用：

- (void)webView:(WKWebView *)webView didCommitNavigation:(WKNavigation *)navigation {
NSString *javascript = @"var meta = document.createElement('meta');meta.setAttribute('name', 'viewport');meta.setAttribute('content', 'width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no');document.getElementsByTagName('head')[0].appendChild(meta);";
[webView evaluateJavaScript:javascript completionHandler:nil];
}

Answer 1

您也可以尝试使用WKUserScript。

这是我的工作配置：

NSString *jScript = @"var meta = document.createElement('meta'); meta.setAttribute('name', 'viewport'); meta.setAttribute('content', 'width=device-width'); document.getElementsByTagName('head')[0].appendChild(meta);";

WKUserScript *wkUScript = [[WKUserScript alloc] initWithSource:jScript injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];
WKUserContentController *wkUController = [[WKUserContentController alloc] init];
[wkUController addUserScript:wkUScript];

WKWebViewConfiguration *wkWebConfig = [[WKWebViewConfiguration alloc] init];
wkWebConfig.userContentController = wkUController;

wkWebV = [[WKWebView alloc] initWithFrame:self.view.frame configuration:wkWebConfig];

您可以为WKWebViewConfiguration添加其他配置。

Answer 2

nferocious76的回答，快速代码： Swift2.x版

let jscript = "var meta = document.createElement('meta'); meta.setAttribute('name', 'viewport'); meta.setAttribute('content', 'width=device-width'); document.getElementsByTagName('head')[0].appendChild(meta);"
let userScript = WKUserScript(source: jscript, injectionTime: WKUserScriptInjectionTime.AtDocumentEnd, forMainFrameOnly: true)
let wkUController = WKUserContentController()
wkUController.addUserScript(userScript)
let wkWebConfig = WKWebViewConfiguration()
wkWebConfig.userContentController = wkUController
let youWebView = WKWebView(frame: CGRectZero, configuration: wkWebConfig)

swift3版

let jscript = "var meta = document.createElement('meta'); meta.setAttribute('name', 'viewport'); meta.setAttribute('content', 'width=device-width'); document.getElementsByTagName('head')[0].appendChild(meta);"
let userScript = WKUserScript(source: jscript, injectionTime: .atDocumentEnd, forMainFrameOnly: true)
let wkUController = WKUserContentController()
wkUController.addUserScript(userScript)
let wkWebConfig = WKWebViewConfiguration()
wkWebConfig.userContentController = wkUController
let yourWebView = WKWebView(frame: self.view.bounds, configuration: wkWebConfig)

Answer 3

与@ nferocious76相似，但用Swift语言

var scriptContent = "var meta = document.createElement('meta');"
scriptContent += "meta.name='viewport';"
scriptContent += "meta.content='width=device-width';"
scriptContent += "document.getElementsByTagName('head')[0].appendChild(meta);"

webView.evaluateJavaScript(scriptContent, completionHandler: nil)

Answer 4

将以下内容添加到我的HTML脚本中对我有帮助。

<meta name="viewport" content="width=device-width, shrink-to-fit=YES">

它与UIWebView中的scalePageToFit相同。

引用：How to set iOS WkWebview zoom scale

Answer 5

C＃版本，用于Xamarin自定义渲染器：

string jScript = @"var meta = document.createElement('meta'); meta.setAttribute('name', 'viewport'); meta.setAttribute('content', 'width=device-width'); document.getElementsByTagName('head')[0].appendChild(meta);";

WKUserScript wkUScript = new WKUserScript((NSString)jScript, WKUserScriptInjectionTime.AtDocumentEnd, true);
WKUserContentController wkUController = new WKUserContentController();
wkUController.AddUserScript(wkUScript);

WKWebViewConfiguration wkWebConfig = new WKWebViewConfiguration();
wkWebConfig.UserContentController = wkUController;
WKWebView webView=new WKWebView(Frame, wkWebConfig);

Answer 6

Swift 5解决方案：

let javaScript = """
    var meta = document.createElement('meta');
                meta.setAttribute('name', 'viewport');
                meta.setAttribute('content', 'width=device-width');
                document.getElementsByTagName('head')[0].appendChild(meta);
    """

webView.evaluateJavaScript(javaScript)

Answer 7

我想出了以下的灵魂。用于使内容适合设备尺寸。

func webView(_ webView: WKWebView, didCommit navigation: WKNavigation!) {     for making the content to fit with the device size
    let jscript = "var meta = document.createElement('meta'); meta.setAttribute('name', 'viewport'); meta.setAttribute('content', 'width=device-width'); document.getElementsByTagName('head')[0].appendChild(meta);"
    webView.evaluateJavaScript(jscript)
}

Answer 8

这些答案中没有一个对我有用。我试图为特定艺术家打开亚马逊URL。事实证明，亚马逊具有移动响应URL和桌面URL。在台式机Safari上，我改用iPhone作为用户代理（“开发”>“用户代理”>“ Safari-iOS 13.1.3-iPhone”），并获得了适用于移动设备的URL。

Answer 9

对我来说这是一项工作，我在meta中添加了两个属性：initial-scale=1.0, shrink-to-fit=yes，这有助于使html文本适合HTML中的图像。

let jscript = "var meta = document.createElement('meta'); meta.setAttribute('name', 'viewport'); meta.setAttribute('content', 'width=device-width, initial-scale=1.0, shrink-to-fit=yes'); document.getElementsByTagName('head')[0].appendChild(meta);"
        
let userScript = WKUserScript(source: jscript, injectionTime: .atDocumentEnd, forMainFrameOnly: true)

let wkUController = WKUserContentController()
        
wkUController.addUserScript(userScript)
        
let wkWebConfig = WKWebViewConfiguration()
        
wkWebConfig.userContentController = wkUController

self.webView = WKWebView(frame: self.view.bounds, configuration: wkWebConfig)

Answer 10

添加元标记或更改Java脚本代码对我不起作用。然后我更改了框架，使其工作良好，在编写以下代码（Swift）之后，我的Web视图对齐并适合屏幕：

var screenWidth: CGFloat {
    return UIScreen.main.bounds.size.width
}

var screenHeight: CGFloat {
    return UIScreen.main.bounds.size.height
}


    yourWebView = WKWebView(frame: CGRect(x: 0, y: 0, width: screenWidth, height: screenHeight), configuration: WKWebViewConfiguration())
    yourWebView.navigationDelegate = self
    yourContainerView.addSubview(yourWebView)

Answer 11

// 100％为我工作

func webView(_ webView: WKWebView, didCommit navigation: WKNavigation!) {
    //print(#function)
    let scriptFontSizeAdjustment = "var style = document.createElement('style');style.innerHTML = 'body { -webkit-text-size-adjust: none; }';document.getElementsByTagName('head')[0].appendChild(style);"

    let scriptImgSizeAdjustment = "var style = document.createElement('style');style.innerHTML = 'img { display: inline;height: auto;max-width: 100%; }';document.getElementsByTagName('head')[0].appendChild(style);"

    webKitView.evaluateJavaScript(scriptFontSizeAdjustment)
    webKitView.evaluateJavaScript(scriptImgSizeAdjustment)

}

Answer 12

这对我来说适合 Swift 5 设备宽度内的图像大小
对来自服务器的动态 html 有帮助

func webView(_ webView: WKWebView, didCommit navigation: WKNavigation!) {
   
    let fontAdjust = "var style = document.createElement('style');style.innerHTML = 'body { -webkit-text-size-adjust: none; }';document.getElementsByTagName('head')[0].appendChild(style);"

    let imgAdjust = "var style = document.createElement('style');style.innerHTML = 'img { display: inline;height: auto;max-width: 100%; }';document.getElementsByTagName('head')[0].appendChild(style);"
webKitView.evaluateJavaScript(imgAdjust)

    webKitView.evaluateJavaScript(fontAdjust)
    webKitView.evaluateJavaScript(imgAdjust)
}

WKWebView相当于UIWebView的scalesPageToFit

12 个答案: