How display a List inside a SwiftUI ScrollView

The SwiftUI mechanism to render a List inside a ScrollView. Includes a snippet.

SOFTWARE DEVELOPMENTIOS DEVELOPMENTSWIFTUI

Eduardo Domínguez Menéndez

7/18/20243 min read

Let's start a new article of my coding school. While working on a sidebar, I encountered an undesired behaviour. My code structure consisted of a ScrollView containing a VStack with buttons and a List. Surprisingly, the List was not displaying. Initially, I suspected a SwiftUI bug, but the system was actually behaving correctly. Why was this happening?

SwiftUI rendering policies for a List and a ScrollView

The problem arises from rendering policies. The ScrollView expects its size from its content, while the List expects its size from its container. This mutual dependency creates a deadlock, with each element waiting for the other's size. The rendering system resolves this deadlock by eliminating the List, this action is called "drop".

How display a List inside a ScrollView

To fix this, I applied the frame modifier to the List, setting a minimum height with frame modifier as you can see in the next code snippet:

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