The @State SwiftUI Property Wrapper

Mutable state in SwiftUI

Steven Curtis

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Photo by Kit Suman on Unsplash

Although I’ve labeled this article as beginner, I’ve noticed that my previous article about property wrappers just didn’t make it seem so. So I think it really asks for a new article about the @State property wrapper.

Difficulty: Beginner | Easy | Normal | Challenging

Prerequisites:

Terminology

Property Wrapper: A property wrapper adds a layer of separation between code that manages how a property is stored and the code that defines a property

@State: a property wrapper used to create a single source of truth for data in your app which mutates over time (and updating a view appropriately).

The @State property wrapper

In Swift, a struct is used to store variables of different data types and views are simple structs.

This leads us to a problem. This problem is that a view struct does not have a mutating function where you can change it’s properties. This means that @State is a solution to this issue, as it can be used to manage mutable state in SwiftUI in the view struct.

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