11 SwiftUI State Management & Data Flow | Watch at 1.5x

What You’ll Learn

@State & @Binding

@State → Local state inside a single view
@Binding → Pass state down so a child can modify parent’s value
Perfect for toggles, text fields, and simple UI state.

ObservableObject

Build models that emit updates
Use @Published to automatically refresh the UI
Connect your view layer with your app’s data layer

@ObservedObject vs @StateObject

@ObservedObject
Use when the parent creates and owns the object
The child only observes changes

@StateObject
Use when the view itself should own the object
Ensures the object isn’t recreated on every re-render

Most common pitfall:
❌ Using @ObservedObject inside a view that initializes the object—causing it to reset every time the view recomputes.

@EnvironmentObject

Use when you need global shared state across multiple views, without passing bindings everywhere.

Great for:
App-wide settings
User session / auth
Shared view models

⚠️ Pitfall:
If a view expects an @EnvironmentObject but the parent doesn’t inject it → app crashes.


When to Use What (Quick Decision Table)
Feature Best Use Case
@State Local state inside a single view
@Binding Child modifies state owned by parent
@ObservedObject View receives a model created elsewhere
@StateObject View owns & manages the model lifecycle
@EnvironmentObject Global shared state across many views


Final Thoughts
If the view owns the state → use @State or @StateObject
If a child needs to modify parent state → use @Binding
If a view receives an object from parent → use @ObservedObject
If state must be shared across the app → use @EnvironmentObject


swiftui state management
swiftui @state tutorial
swiftui @binding explained
swiftui observableobject
swiftui stateobject vs observedobject
swiftui environmentobject crash
swiftui data flow explained
swiftui beginners course
swiftui MVVM data layer
ios development swiftui
swiftui viewmodel state
swiftui 2025 course


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