How to disable the magnifying glass in UIWebview?

问题:

How can I disable the magnifying glass that appears when you hold the touch on a UIWebView? I don't want to to disable user interaction but I don't want the webview to show that zoom glass. Any Ideas?

回答1:

No, the loupe is inextricably linked to selection. To disable it, you will have to disable selection entirely (you can use -webkit-user-select: none to do that).

回答2:

Because the accepted solution did not work for me, I had to look for other options and I found one.
Note that I don't know if Apple approves this technique. Use it at your own fear and risk.

(Ours wasn't rejected; I don't think Apple cares that much about you messing with UIWebView internals, but be warned.)

What I did was recursively walk down UIWebView subviews and enumerate their gestureRecognizers. Whenever I encounter a UILongPressGestureRecognizer, I set its enabled to NO.

This gets rid of the magnifying glass altogether and obviously disables any default long-press functionality.

It seems like iOS re-enables (or re-creates) these gesture recognizers whenever user begins to edit text.
Well, I don't mind using magnifying glass in text fields so I don't disable them immediately.

Instead, I wait for blur event on my text elements, and when it occurs, I walk the subview tree again.
Simple as that, and it works.

回答3:

Because I don't know how to use -webkit-user-select: none I looked for other ways. And I stumble into this Customize the contextual menu of UIWebView then I combined it with -webkit-user-select: none.

- (void)webViewDidFinishLoad:(UIWebView *)webView
{
   [webView stringByEvaluatingJavaScriptFromString:@"document.body.style.webkitUserSelect='none';"];
}

回答4:

I have found that -webkit-user-select: none; alone doesn't do the trick. Instead I have found a quite undocumented property -webkit-touch-callout

What I usually do with Phonegap apps is this:

body, body * {
    -webkit-user-select: none !important;
    user-select: none !important;
    -webkit-user-callout: none !important;
    -webkit-touch-callout: none !important;
}
input, textarea {
    -webkit-user-select: text !important;
    user-select: text !important;
    -webkit-user-callout: default !important;
    -webkit-touch-callout: default !important;
}

Somewhere it was mentioned that -webkit-user-callout is a legacy version of -webkit-touch-callback, I have put this in just in case.

回答5:

For our Cordova & Swift project I did:

override init!(webView theWebView: UIWebView!)
    {            
        super.init(webView: theWebView)

        removeLoupe()
    }

    /**
        Removes the magnifying glass by adding a long press gesture that overrides the inherent one that spawns
        a the loupe by default.
    */
    private func removeLoupe()
    {
        let views = webView?.subviews
        if (views == nil || views?.count == 0)
        {
            return
        }

        let longPress = UILongPressGestureRecognizer(target: self, action: "handleLongPress:")
        longPress.minimumPressDuration = 0.045
        longPress.allowableMovement = 100.0

        for view in views!
        {
            if (view.isKindOfClass(UIScrollView))
            {
                let subViews = view.subviews
                let browser = subViews[0]
                browser.addGestureRecognizer(longPress)
                break;
            }
        }
    }

    /**
       Hack to override loupe appearence in webviews.
    */
    func handleLongPress(sender:UILongPressGestureRecognizer)
    {

    }

Note that this is my CDVPlugin class (or rather my custom version of it).

Make sure your config.xml file has:

<feature name="CustomCDVPlugin">
    <param name="ios-package" value="CustomCDVPlugin" />
    <param name="onload" value="true" />
</feature>

This will ensure the init() method is called.