与UIWebView的scalesPageToFit等效的WKWebView

我正在更新我的iOS应用，以替换UIWebView为WKWebView。但是我不明白如何使用来实现相同的行为WKWebView。使用，UIWebView我scalesPageToFit可以确保以与屏幕大小相同的大小显示Web页（以便在不滚动的情况下显示为全屏）。

我在网上发现了该解决方案，但是它不起作用：

- (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];
}

您也可以尝试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];

您可以将其他配置添加到WKWebViewConfiguration。

nferocious76的回答，以快速代码显示：Swift2.x版本

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版本

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)

与@ nferocious76相似，但使用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)

C＃版本，用于Xamarin Custom Renderer：

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);

我想通了灵魂。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)
}

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。

参考：如何设置iOS WkWebview缩放比例

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)

对于我来说，这项工作非常有效，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)

// 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)

}

这些答案都不对我有用。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。在桌面Safari上，我更改为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。