URI HTTPS request

Thanks! This is helpful. You're using WKWebView, and you already have didFinishNavigation implemented, which is where you'll grab the token from the URL. That is, switch to the redirect receiver version and access webView.URL inside didFinishNavigation. You can check if webView.URL is the redirect receiver, and parse the token from the URL if so.

For example, you can do something like this:

 if (webView.URL?.scheme == "https" && webView.URL?.host == "www.dropbox.com" && webView.URL?.path == "/1/oauth2/redirect_receiver") {
     print(webView.URL?.fragment)
     // parse out access token
 }

Here's how SwiftyDropbox does the parsing:

https://github.com/dropbox/SwiftyDropbox/blob/abb413a4788bd8c2dade1103414d52330e1cb552/Source/OAuth.swift#L364

Also, don't forget to check your state parameter, which should be randomly generated each time. 

Finally, note you'll also need to set disable_signup=true on /authorize to comply with Apple's rules.