Performance Optimization with SwiftUI’s onAppear and onDisappear Modifiers

Leverage these lifecycle modifiers to enhance app performance and manage resources efficiently.

Photo by Christin Hume on Unsplash

In SwiftUI, managing view lifecycle events is crucial for building responsive and efficient applications. The onAppear and onDisappear modifiers are powerful tools that allow you to execute code when a view appears or disappears on the screen. Understanding how to use these modifiers effectively can significantly enhance your app's performance and ensure resources are managed efficiently. In this article, we’ll explore practical ways to use onAppear and onDisappear to optimize your SwiftUI applications.

Understanding onAppear and onDisappear

What is onAppear?

The onAppear modifier allows you to run a block of code every time a view appears on the screen. This can be useful for tasks like:

• Fetching data from a network or database.
• Starting animations.
• Updating UI elements based on the latest data.

What is onDisappear?

Conversely, the onDisappear modifier lets you execute code when the view is removed from the…