[keycloak-user] iOS App login with Keycloak

Hi Guys, We are building a system, including 3 subsystems for a big website. and iOS and Android app. We use KeyCloak as the SSO server for all subsystems, and then we also want to use KeyCloak for iOS and Android as the login server. But for iOS, Android we want to use native login page not the html page provide by KeyCloak adapter. but I read all documents and discussions, I didnt find a way how to implement it. Anybody can help me? thanks. Joey