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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (CB-13382) Cordova iOS - Method to correctly destroy CDVViewControllers webView object
Date Tue, 27 Feb 2018 22:56:00 GMT


ASF GitHub Bot commented on CB-13382:

surajpindoria closed pull request #342: CB-13382: (ios) Added destroyWebView method for CDVViewController

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> Cordova iOS - Method to correctly destroy CDVViewControllers webView object
> ---------------------------------------------------------------------------
>                 Key: CB-13382
>                 URL:
>             Project: Apache Cordova
>          Issue Type: Improvement
>          Components: cordova-ios
>    Affects Versions: cordova-ios 4.5.0
>            Reporter: Nick Deakin
>            Assignee: Suraj Pindoria
>            Priority: Minor
> We have an app where we are using multi CDVViewController instances where a user can
switch between hybrid apps within the native app.
> The issue that as been lingering for a couple of years is that even though a CDVViewController
instance can be set to nil, the webview contained within still remains in memory. This can
be observed when using the safari debugger.
> This is particularly troublesome when the webview is 'closed', then the content files
in the webview are updated, and finally the webview is recreated, showing the old content.
Performing a cmd-r in safari debugger refreshes the view and shows the updated content. 
> We can also do this a [UIWebView reload], but it is not possible if the app changes it's
URL to a none physical path, e.g. file:///xxxxx/myApp/www/index.html becomes file:///xxxxx/myApp/www/home,
then we get a page load error.
> I've been able to get the webview completely removed by doing the following:
> add the following method to CDVViewController:
> {code:java}
> -(void)destroyWebView {
>     self.webViewEngine = nil;
> }
> {code}
> then in my view controllers destroy method:
> {code:java}
>     [self.webViewEngine loadHTMLString:@"about:blank" baseURL:nil];
>     [self.pluginObjects removeAllObjects];
>     [self.webView removeFromSuperview];
>     [self destroyWebView];
> {code}
> Setting webViewEngine to nil is an unavoidable step to completely destroying the webview,
but it is readonly. 
> Therefore, i would really appreciate this destroyWebView method, or a similar cleanup
method being added.
> Android has a method to clean up which is CordovaWebViewImpl.handleDestroy().
> This destroys all the plugins, sets the URL to 'about:blank' and then executes engine.destroy()
> Many thanks!
> Nick

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