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SwiftUI View Lifecycle

vadimbulavin.com · 1,067 words · saved by 1 readers

Each view undergoes a series of events from its birth to its death, which is referred to as a lifecycle. Understanding it is essential when building apps in SwiftUI. In this article, we will explore the three phases of the SwiftUI view lifecycle. Before we talk about lifecycle, we need to agree on what a view is. To describe what’s displayed onscreen, we create a graph of views. View is a definition of a piece of UI. [1]. SwiftUI uses this definition to create an appropriate rendering. View is a function of a state [2]. To update UI, we don’t mutate the view graph directly. Instead, we modify the state, and a new view graph is calculated from the state. Then SwiftUI performs rendering to reflect the changes. The identity and lifetime of SwiftUI views are separate from the lifetime of structs that define them [1]. SwiftUI.ViewGraph manages a rendering and non-rendering hierarchy of views. From what I’ve learned from reflecting the SwiftUI binary, their corresponding names are DisplayLis

Each view undergoes a series of events from its birth to its death, which is referred to as a lifecycle . Understanding it is essential when building apps in SwiftUI. In this article, we will explore the three phases of the SwiftUI view lifecycle. Before we talk about lifecycle, we need to agree on what a view is. Understanding SwiftUI Views To describe what’s displayed onscreen, we create a graph of views . View is a definition of a piece of UI. [1] . SwiftUI uses this definition to create an appropriate rendering. View is a function of a state [2] . To update UI, we don’t mutate the view gra

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