Axios library in React Native - UI Render Trace

Component - Axios library

This React Native component uses the Axios library to fetch data from the internet when a button is pressed. It shows a loading message while waiting and then displays the fetched data or an error message.

Widget Tree

View
├── Text (shows status or data)
└── Button (triggers data fetch)

The main container is a View holding two children: a Text component that displays messages or data, and a Button that the user taps to start fetching data.

Render Trace - 5 Steps

Step 1: View

Step 2: Text

Step 3: Button

Step 4: Text (after button press)

Step 5: Text (after data fetch success)

State Change - Re-render

Trigger:User taps the 'Load Data' button

Before

Text shows 'Press the button to load data', no data loaded

→

After

Text shows 'Loading...' then updates to fetched data or error message

Re-renders:The Text component re-renders to update the displayed message

UI Quiz - 3 Questions

What happens on the screen immediately after pressing the 'Load Data' button?

A The button disappears

B The text changes to 'Loading...'

C The screen goes blank

D An alert pops up

Key Insight

Using Axios in React Native allows easy fetching of data from the internet. The UI should clearly show loading states and update only the parts that need to change, like the Text component here, to keep the app responsive and user-friendly.