Flutter Tutorial 40 : Lifting state backup in flutter скачать в хорошем качестве

Flutter Tutorial 40 : Lifting state backup in flutter

In this episode you will learn the concept of Lifting state backup. this design pattern allow you to trigger a state change and rebuild a layout from withing a stateless widget. Lifting State Up in Flutter "Lifting state up" is a core Flutter pattern for sharing state between multiple widgets, but "state backup" typically refers to app state restoration Lifting state up is a technique for managing ephemeral (local) state by moving it to a common parent widget. The core principles are: Single Source of Truth: The parent widget holds the state, ensuring all child widgets dependent on that state are in sync. Stateless Children: Child widgets become stateless, receiving data via constructor parameters and communicating updates back to the parent using callbacks (e.g., a function passed as a parameter). Rebuilds: When the parent calls setState(), only necessary parts of the UI are rebuilt, improving performance.