luokai0 Quick Reference
| Topic | File |
|---|---|
| setState, state loss, keys | state.md |
| build method, context, GlobalKey | widgets.md |
| FutureBuilder, dispose, mounted | async.md |
| Context after pop, deep linking | navigation.md |
| const, rebuilds, performance | performance.md |
| Platform channels, null safety | platform.md |
Critical Rules
setStateafter dispose — checkmountedbefore calling, crashes otherwise- Key missing on list items — reordering breaks state, always use keys
- FutureBuilder rebuilds on parent rebuild — triggers future again, cache the Future
- BuildContext after async gap — context may be invalid, check
mountedfirst constconstructor — prevents rebuilds, use for static widgetsStatefulWidgetrecreated — key change or parent rebuild creates new state- GlobalKey expensive — don't use just to access state, pass callbacks instead
disposeincomplete — cancel timers, subscriptions, controllers- Navigator.pop with result — returns Future, don't ignore errors
- ScrollController not disposed — memory leak
- Image caching — use
cached_network_image, default doesn't persist - PlatformException not caught — platform channel calls can throw