防止 Angular NativeScript WebView 使用捏合缩放进行缩放 [英] Prevent Angular NativeScript WebView from zooming with pinch zoom
问题描述
所以我有一个使用 Angular 的 Nativescript 应用程序(NG 5.1.1/Angular 7.x)
So I have a Nativescript App using Angular (NG 5.1.1 / Angular 7.x)
我有一个带有 web 视图的视图.
I have a view with a webview.
@ViewChild("myWebView") webViewRef: ElementRef;
<WebView class="webview" #myWebView [src]="myURL"></WebView>
在我的 webview.component.ts 里面有这个.
Inside my webview.component.ts I have this.
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;
}
});
}
正如你所看到的,我尝试了各种方法来让这个 webview 不捏缩放.
As you can see i've tried all sorts of stuff to get this webview to not pinch zoom.
我用
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 并捏缩放时,我的控制台日志显示:
When I load my webview and pinch zoom my console log says this:
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??但我就是不能让它去?我以为我应该在尝试捏缩放时返回 null/undefined ?这是其他一些 SO 答案/网络所说的,但没有任何效果.
So I feel like I am close?? but I just can't get it to go? I thought I was suppose to return null / undefined when trying to pinch zoom? which is what a few other SO answers / the web say to do but nothing is working.
HTML 页面也有正确的元标记标题...
the HTML page also has the correct metatag headers...
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=0, minimal-ui"/>
任何帮助将不胜感激!谢谢!!
Any help would be appreciated! Thanks!!
推荐答案
您必须覆盖由 tns-core-modules 设置的默认元数据.
You have to override the default meta data being set by tns-core-modules.
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,因为您正在使用Angular 您可以将以上几行添加到您的 app.component.ts
Here is a Playground Sample, since you are using Angular you may add the above lines to your app.component.ts
这篇关于防止 Angular NativeScript WebView 使用捏合缩放进行缩放的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!