Cookie sharing between multiple WKWebViews

Got this working by using the same WKProcessPool for all the webviews.

First create a process pool once somewhere:

processPool = [[WKProcessPool alloc] init];

Then use it when creating WKWebviews. The pool must be set in the init method, not afterwards.

WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];
config.processPool = processPool;
webview = [[WKWebView alloc] initWithFrame:frame configuration:config];