Wei Li I had a quick look earlier and I have managed to get SSO working with iOS 11. I added some notes here to get it working - https://github.com/feedhenry/mobile-security-ios-template/issues/17

We should be able to support Chrome, Firefox and Opera too. I think the problem with it not working to date was that we were using the Safari InAppBrowser (could be seen by the way it asked if you want to open the Keycloak URL vs being asked to open the Safari App). The changes I did will open the Safari App, or whichever browser the user wants.