iOS WKWebview 适应屏宽和禁止捏合缩放

在
- (void)webViewDidFinishLoad:(UIWebView *)webView{

// 禁止放大缩小

    NSString *injectionJSString = @"var script = document.createElement('meta');"

    "script.name = 'viewport';"

    "script.content=\"width=device-width, user-scalable=no\";"

    "document.getElementsByTagName('head')[0].appendChild(script);";

    [_webView evaluateJavaScript:injectionJSString completionHandler:nil];

}