List view basics in iOS Swift - UI Render Trace

Component - List view basics

This UI component shows a simple list of items vertically. Each item is a row that the user can scroll through. It helps display many pieces of information in a clean, organized way.

Widget Tree

NavigationView
└── List
    ├── Text ("Apple")
    ├── Text ("Banana")
    ├── Text ("Cherry")
    └── Text ("Date")

The NavigationView is the main container that provides a navigation bar. Inside it, the List displays multiple Text rows stacked vertically. Each Text widget shows one fruit name as a list item.

Render Trace - 6 Steps

Step 1: NavigationView

Step 2: List

Step 3: Text ("Apple")

Step 4: Text ("Banana")

Step 5: Text ("Cherry")

Step 6: Text ("Date")

State Change - Re-render

Trigger:User scrolls the list

Before

List shows top four items: Apple, Banana, Cherry, Date

→

After

List scrolls vertically to reveal more items if available

Re-renders:List component updates visible rows as user scrolls

UI Quiz - 3 Questions

What widget contains the list of items?

A List

B Text

C NavigationView

D Button

Key Insight

Using a List inside a NavigationView is a common pattern on iOS to show scrollable rows with a navigation bar. Each row is a simple Text widget here, but can be customized with images or buttons. The List handles scrolling and efficient row reuse automatically.