防止 Angular NativeScript WebView 使用双指缩放进行缩放

Question

所以我有一个 Nativescript 应用程序使用 Angular (NG 5.1.1 / Angular 7.x)

我有一个 webview 视图。

    @ViewChild("myWebView") webViewRef: ElementRef;

    <WebView class="webview" #myWebView [src]="myURL"></WebView>

我的webview.component.ts里面有这个。

ngAfterViewInit(): void {
    const webview: WebView = this.webViewRef.nativeElement;

    webview.on(WebView.loadFinishedEvent, (args: LoadEventData) => {
        this.setIndicatorFalse();
        if (webview.ios) {
            webview.ios.scrollView.delegate = UIScrollViewDelegateZ.new();
            webview.ios.scrollView.minimumZoomScale = 1;
            webview.ios.scrollView.maximumZoomScale = 1;
        }
    });
    webview.on(WebView.loadStartedEvent, (args: LoadEventData) => {
        if (webview.android) {
            webview.android.getSettings().setBuiltInZoomControls(false);
            webview.android.getSettings().setDisplayZoomControls(false);
        } else {
            // @ts-ignore
            webview.ios.multipleTouchEnabled = false;
            webview.ios.scalesPageToFit = false;
            webview.ios.scrollView.bounces = false;
            webview.ios.scrollView.showsHorizontalScrollIndicator = true;
            webview.ios.scrollView.showsVerticalScrollIndicator = true;
            webview.ios.opaque = false;
            webview.ios.scrollView.allowsInlineMediaPlayback = true;
            webview.ios.scrollView.mediaPlaybackRequiresUserAction = false;
        }
    });
}

如您所见，我已经尝试了各种方法来让这个 webview 不缩放。

我正在用

覆盖我的 ViewDelegate

webview.ios.scrollView.delegate = UIScrollViewDelegateZ.new();

那个文件在这里

export class UIScrollViewDelegateZ extends NSObject implements UIScrollViewDelegate {

public static ObjCProtocols = [UIScrollViewDelegate];

static new(): UIScrollViewDelegateZ {
    console.log("here we are");

    return <UIScrollViewDelegateZ>super.new();
}

viewForZoomingInScrollView(scrollView: UIScrollView): UIView {
    console.log("viewForZoomingInScrollView");

    return null;
}

scrollViewDidScroll(scrollView: UIScrollView): void {
    console.log("scrollViewDidZoom");

    return null;
}

scrollViewWillBeginZoomingWithView(scrollView: UIScrollView, view: UIView): void {
    console.log("scrollViewWillBeginZoomingWithView   " + scrollView);

    return null;
    }
}

当我加载我的 webview 并缩放时，我的控制台日志是这样的：

 CONSOLE LOG file:///app/app/webview/scrollDelegate.js:9:20: here we are
 CONSOLE LOG file:///app/app/webview/scrollDelegate.js:21:20: scrollViewWillBeginZoomingWithView   <WKScrollView: 0x7fb140afe000; baseClass = UIScrollView; frame = (0 0; 375 603); clipsToBounds = YES; gestureRecognizers = <NSArray: 0x600000ab2100>; layer = <CALayer: 0x600000537480>; contentOffset: {0, 0}; contentSize: {375, 1916}; adjustedContentInset: {0, 0, 0, 0}>
 CONSOLE LOG file:///app/app/webview/scrollDelegate.js:17:20: scrollViewDidZoom

所以我觉得我很亲近？？但我不能让它去？我以为在尝试捏缩放时我应该 return null / undefined ？这是其他一些 SO 答案/网络所说的，但没有任何效果。

HTML 页面也有正确的元标记 headers...

  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0, minimal-ui"/>

如有任何帮助，我们将不胜感激！谢谢！！

Answer 1

您必须覆盖由 tns-core-modules 设置的默认元数据。

import { WebView } from 'tns-core-modules/ui/web-view';

declare var WKUserScript, WKUserScriptInjectionTime, WKUserContentController, WKWebViewConfiguration, WKWebView, CGRectZero;

(<any>WebView.prototype).createNativeView = function () {
    const jScript = `var meta = document.createElement('meta'); 
    meta.setAttribute('name', 'viewport');
    meta.setAttribute('content', 'initial-scale=1.0 maximum-scale=1.0');
    document.getElementsByTagName('head')[0].appendChild(meta);`;
    const wkUScript = WKUserScript.alloc().initWithSourceInjectionTimeForMainFrameOnly(jScript, WKUserScriptInjectionTime.AtDocumentEnd, true);
    const wkUController = WKUserContentController.new();
    wkUController.addUserScript(wkUScript);
    const configuration = WKWebViewConfiguration.new();
    configuration.userContentController = wkUController;
    configuration.preferences.setValueForKey(
        true,
        "allowFileAccessFromFileURLs"
    );
    return new WKWebView({
        frame: CGRectZero,
        configuration: configuration
    });
};

这是一个 Playground Sample，因为您使用的是 Angular，您可以将以上行添加到您的 app.component.ts

防止 Angular NativeScript WebView 使用双指缩放进行缩放

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