Скачать или смотреть Flutter Tutorial - Flutter Keys & Unique Key

Use the Flutter Unique Key To Preserve the state of Stateful Widgets if they moved around in the Widget tree. The main Flutter Keys are UniqueKey, ValueKey, GlobalKey & ObjectKey.
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RESOURCES
GlobalKey Tutorial:    • Flutter Tutorial - Flutter Keys & Global Key  
ValueKey Tutorial:    • Flutter Tutorial - Flutter Keys & Value Key  
Stateful Widget Lifecycle Tutorial:    • Flutter Tutorial - Stateful Widget Lifecyc...  
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TIMELINE
0:00 Introduction Unique Key
0:52 Create Example App
2:41 Stateful Widget Needs Key
3:06 Why Is Key Needed?
3:53 Add Unique Key
4:28 Where To Add Unique?
5:52 Differences Between Unique Key & Value Key



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