SwiftUI BasicsLesson 45Free preview

SwiftUI Data Flow

This lesson is part of Swift · All levels

Summary

This lesson reviews the data flow architecture in SwiftUI through the main property wrappers: @State, @Binding, @ObservedObject, and @EnvironmentObject. At SwiftUI, the 'Single Source of Truth' is the foundation of design: changes to the data state instantly reshape the view that depends on it.

Key points

@State is used to manage local state data belonging to the internal one View
@Binding creates a two-way reference link to @State belonging to the parent view without copying the data
@StateObject / @ObservedObject binds an external class that adopts ObservableObject
@EnvironmentObject shares data together across the tree hierarchy view without the need for manual passing

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