Menene bambanci tsakanin StatelessWidget da StatefulWidget?

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Flutter yana da nau'i-nau'i makarantarmu gida biyu: **StatelessWidget** (ba ta iya canzawa, babu cikin jikin alaƙa da ke canzawa) da **StatefulWidget** (zata iya riƙa da sabunta mutable state, sake gina aiki lokacin da state ya canza). Zabar daidai ɗaya shine asali ga gina Flutter UIs. ## StatelessWidget — babu canzawar state ```dart // a StatelessWidget: just describes UI based on its inputs (immutable, no internal state) class Greeting extends StatelessWidget { final String name; const Greeting(this.name); @override Widget build(BuildContext context) { return Text('Hello, $name'); // UI depends only on inputs, never changes itself } } // → use for UI that doesn't change on its own (static content, displays based on inputs) ``` ## StatefulWidget — yana da mutable state ```dart // a StatefulWidget: holds STATE that can change → rebuilds the UI when it does class Counter extends StatefulWidget { @override State createState() => _CounterState(); } class _CounterState extends State { int count = 0; // mutable STATE @override Widget build(BuildContext context) { return Column(children: [ Text('Count: $count'), ElevatedButton( onPressed: () => setState(() => count++), // setState → rebuild with new state child: Text('Increment'), ), ]); } } ``` ## setState — mahallin StatefulWidget ```text → setState(() { ... }) tells Flutter the state CHANGED → triggers a REBUILD (build() runs again with the new state, updating the UI) → WITHOUT setState, changing a variable won't update the UI → StatefulWidget = widget config (immutable) + a State object (holds mutable state) ``` ## Zabar ```text STATELESS → UI based purely on inputs; doesn't change itself (most widgets; simpler) STATEFUL → needs to hold/change internal state over time (counters, forms, toggles, animations, anything interactive that changes) → Prefer Stateless when possible (simpler); use Stateful when you need changing state. ``` ## Me ya sa haka ya mahalci Aubuta bambancin tsakanin StatelessWidget da StatefulWidget shine asali ga Flutter development saboda zabar daidai ɗaya shine mahimmanci ga gina aiki UIs, saboda haka shine ilimin tushe da dole. Bambancin — **StatelessWidget** (ba ta iya canzawa, bayyana UI kawai bisa ga abubuwan shiryayya, ba ta canzawa kaɗai) versus **StatefulWidget** (riƙa mutable state da zata iya canzawa, sake gina UI yayin da haka take) — shine ɗaya daga cikin farkon da mahimmancin ra'ayoyi a cikin Flutter, yana ƙayyade yadda kuke gina kowane widget. Aubuta cewa **StatelessWidget** ya dace da UI da ba ta canzawa kaɗai (makasuwa na tsaye, nunawa bisa ga abubuwan shiryayya — mafi yawancin widgets, da sauƙi) yayin da **StatefulWidget** ya buƙaci don wani abu mai canzawa cikin state (lissafi, forms, toggles, abubuwan hulɗa) shine mahimmanci don zabar daidai. Mafi mahimmanci, aubuta **setState** — makasuwa da ta gaya wa Flutter cewa state ya canza, sa ƙayyade sake gina don UI ta sabunta (da cewa ba tare da haka ba, canja ɗaki bai sabunta UI ba, karamin kuskure na malami) — shine asali ga sa StatefulWidgets aiki. Aubuta cewa StatefulWidget yana haduwa da na'ura alaƙa da ba ta iya canzawa tare da ɗaban ɗaban State jiya riƙa mutable state yana farantawa tsarin sa. Jagora don **fifita StatelessWidget lokacin da zai yiwu** (sauƙi) da amfani StatefulWidget ne kawai lokacin da canzawar state ya buƙaci ta nuna kyau. Tunda kusan kowane Flutter widget kake gina shine ɗaya daga cikin nau'i-nau'i biyu da zabar daidai (da amfani setState daidai) shine mahimmanci ga gina aiki, hulɗa UIs, aubuta StatelessWidget vs StatefulWidget — bambancin, lokacin amfani kowane ɗaya, da mahimmancin sashe na setState — shine mahimmanci, ilimin tushe na Flutter, ɗaya daga cikin mahimmancin ra'ayoyi a cikin Flutter development da kowane mai haɓaka Flutter dole ne ya fahimta don gina aiki interface masu amfani.