iOS/macOS: distinct sign_in_unavailable error code when the sign-in UI won't present - #237
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…n't present On iOS/macOS, once the authentication handler has been set and the player is still not authenticated, GameKit will not present the sign-in UI again from the app. The usual cause is that Game Center is turned off or restricted in the device's Settings, or no account is signed in there — something the user can only resolve in Settings, not by retrying in-app. (No sign-in sheet is necessarily shown first: with Game Center disabled the initial `signIn` resolves with an error and never presents UI; the next call lands in this branch.) The plugin previously surfaced this as `failed_to_authenticate`, making it indistinguishable from a normal failed/declined attempt that the user can retry. Add a dedicated `sign_in_unavailable` PluginError and return it from that branch so apps can tell "the user can retry" apart from "send the user to device Settings" and route accordingly. Android is untouched; the Dart interface is unchanged (this only refines the error code string carried by the existing PlatformException). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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Jun 27, 2026
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Added a separate error code for iOS when the sign-in UI won't present, so that client apps can distinguish between "The user saw the modal and closed it without signing in" and "The modal didn't show".
As an example for what that's useful: In my app I have a button for the user to sign into Game Center / Google Play. The Game Center modal won't show when it's been closed once already or when Game Center is switched off in the settings. In that case, I show a dialog directing the user to navigate to the settings and activating Game Center there.
For Android it's not necessary, because from my tests, the sign in UI would show every time, no matter how many times it's been declined already.