Clear cookies for WKWebView?

问题:

For an iOS 8 app I want to use a WKWebView for a custom authentication ViewController that I'm building. However, I can't seem to figure out how to clear the stored cookies for the WKWebView. Is it not possible at all, right now?

I don't have control over the server side, and the service is sending what looks like a permanent (or at least a long lived) cookie when the user logs in successfully. The problem is, if the user wants to change their login, then it becomes impossible, because even if the user logs out and presses login again, then the server automatically redirects using the stored cookies and logs them back again.

Open to ideas and suggestions, thanks!

In UIWebView it was simple to clear stored cookies, all you had to do was this:

NSHTTPCookieStorage *storage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
for (NSHTTPCookie *cookie in [storage cookies])
{
    [storage deleteCookie:cookie];
}

But, the WKWebView does not seem to use the NSHTTPCookieStorage because I've already tried to do this before loading the request in the WKWebView! :(

回答1:

The answer was provided to me on the internal Apple forums: use a mutable NSURLRequest, and set HTTPShouldHandleCookies to NO:

let req: NSMutableURLRequest = NSMutableURLRequest(URL:openURL)
req.HTTPShouldHandleCookies = false
webView.loadRequest(req)

No cookies sent to the web site, so you get the login screen (for testing) every time.

回答2:

It seems like NSHTTPCookieStorage is now being used in iOS 8.2 to correctly clear cookies, as required. I had shipped an app which would run this code prior to opening a WKWebView based login:

NSHTTPCookieStorage *storage = [NSHTTPCookieStorage sharedHTTPCookieStorage];
for (NSHTTPCookie *cookie in [storage cookies])
{
    [storage deleteCookie:cookie];
}

Where earlier than iOS 8.2 the website would auto-login using the saved cookies, it now correctly asks the user to re-login. All this happened without me shipping an update to the app. :)

Thanks for the heads-up @jackreichert !