[Solved] Why does SwiftUI require ObservableObject classes to be reference types (classes) and not structs? — Ans: Because ObservableObject relies on shared mutable state that structs cannot... | iOS Swift

iOS Swift - State Management in SwiftUI

Why does SwiftUI require ObservableObject classes to be reference types (classes) and not structs?

ABecause ObservableObject relies on shared mutable state that structs cannot provide.

BBecause structs cannot conform to protocols.

CBecause structs do not support property wrappers.

DBecause classes are faster than structs.

Step-by-Step Solution

Solution:

Step 1: Understand value vs reference types
Structs are value types and copied on change; classes are reference types shared across views.
Step 2: ObservableObject needs shared mutable state
ObservableObject must notify multiple views about changes to the same instance, requiring reference semantics.
Final Answer:
Because ObservableObject relies on shared mutable state that structs cannot provide. -> Option A
Quick Check:
ObservableObject requires reference type for shared state [OK]

Quick Trick: ObservableObject needs shared mutable state, so must be class [OK]

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Why does SwiftUI require ObservableObject classes to be reference types (classes) and not structs?