Computer Science
Grade 10
20 min
4. React Native Components: Text, Image, View, and Button
Explore basic React Native components such as Text, Image, View, and Button, and how to use them to build app interfaces.
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1
Introduction & Learning Objectives
Learning Objectives
Compose complex layouts by nesting View components with Flexbox styling.
Implement interactive UI by handling user input with the Button component's onPress prop.
Dynamically display images from both local project assets and remote web URLs.
Apply distinct styles to different parts of a sentence by nesting Text components.
Create a reusable custom component by combining View, Text, Image, and Button.
Manage and display simple dynamic data using the useState hook to create interactive elements.
Ever wondered how an app like Instagram builds a post with an image, a caption, and a like button all perfectly arranged? 🤔 Let's learn how to build those exact blueprints!
These four components—View, Text, Image, and Button—are the fundamental building...
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Key Concepts & Vocabulary
TermDefinitionExample
Component CompositionThe process of building complex user interfaces by combining smaller, simpler components. Think of it like using basic Lego bricks to build an elaborate castle.A <View> component can act as a container holding an <Image> and a <Text> component to create a user profile card.
Props (Properties)A mechanism for passing data and configuration into a component from its parent, similar to arguments in a function. Props are read-only.For a <Button> component, we pass a 'title' prop to set its text: <Button title='Click Me' />. For an <Image>, we pass a 'source' prop.
StateData that is managed within a component and can change over time due to user interaction or other events. When state ch...
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Core Syntax & Patterns
Component Nesting Syntax
<ParentComponent>
<ChildComponent />
</ParentComponent>
In React Native, you build your UI tree by placing components inside other components. A <View> is the most common container, but <Text> can also contain other <Text> components for styling purposes.
Image Source Prop Syntax
Local: <Image source={require('./assets/icon.png')} />
Remote: <Image source={{ uri: 'https://reactnative.dev/img/tiny_logo.png' }} />
The 'source' prop for an Image component requires a specific format. Use the `require()` function for local images bundled with your app. For images from the internet, use an object with a 'uri' key.
onPress Event Handler
<Button onPress={() =&g...
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Challenging
You are designing a reusable `<UserInfo>` component that displays a user's name and profile picture and has a 'Follow' button. The component needs to be told what to do when 'Follow' is pressed. Which implementation strategy is most correct and reusable?
A.The component accepts `user` (an object with name and picture URL) and `onFollow` (a function) as props. The `<Button>`'s `onPress` is set to `{props.onFollow}`.
B.The component uses `useState` to manage the user data and the follow action, making it self-contained.
C.The component is hard-coded to update a global state variable when the 'Follow' button is pressed.
D.The component accepts a single prop `config` which is a string containing the user data and the function body for the follow action.
Easy
In React Native, what is the primary purpose of the `<View>` component?
A.To display formatted text and handle font styles.
B.To create interactive buttons that respond to user presses.
C.To act as a container for other components and to structure the layout of the UI.
D.To display images from local or remote sources.
Easy
Which prop is used to assign an event handler function to a `<Button>` component that runs when a user taps it?
A.onClick
B.onPress
C.handleTap
D.onEvent
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