React Native 面试题与答案

问题 6. What are Props in React Native?

Props (short for properties) are a mechanism to pass data from a parent component to a child component in React Native. They are immutable and used to customize the child component.

Example:

问题 7. Explain the React Native component lifecycle.

The React Native component lifecycle consists of several phases such as mounting, updating, and unmounting. Key methods include componentDidMount, componentDidUpdate, and componentWillUnmount.

问题 8. What is the purpose of 'setState' in React Native?

'setState' is used in React Native to update the state of a component. It triggers a re-render of the component and its children with the updated state.

Example:

const handleClick = () => {
  setState({ count: count + 1 });
};

问题 9. What is the role of 'FlatList' in React Native?

'FlatList' is a component in React Native used for efficiently rendering a scrolling list of data. It only renders the components that are currently in view.

Example:

  data={data}
  renderItem={({ item }) => {item.title}}
/>

问题 10. Explain the concept of 'Redux' in React Native.

Redux is a state management library for React Native applications. It centralizes the application's state and allows for predictable state changes through actions and reducers.