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ComponentFC useRef
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| /* eslint-disable react-native/no-inline-styles */ | |
| import React, { | |
| Component, | |
| useRef, | |
| useImperativeHandle, | |
| forwardRef, | |
| } from 'react'; | |
| import { View, Button, Text } from 'react-native'; | |
| class ComponentC extends React.Component<{ name: string }> { | |
| doSomething() { | |
| console.log(' => ComponentC.doSomething'); | |
| } | |
| render() { | |
| return ( | |
| <View> | |
| <Text>{this.props.name}</Text> | |
| </View> | |
| ); | |
| } | |
| } | |
| type ComponentFCRef = { | |
| doSomething(): void; | |
| }; | |
| interface ComponentFCProps { | |
| name: string; | |
| } | |
| const ComponentFC = forwardRef<ComponentFCRef, ComponentFCProps>(function ( | |
| props: { name: string }, | |
| ref: React.Ref<ComponentFCRef>, | |
| ): JSX.Element { | |
| useImperativeHandle(ref, () => ({ | |
| doSomething: () => { | |
| console.log(' => ComponentFC.doSomething'); | |
| }, | |
| })); | |
| return ( | |
| <View> | |
| <Text>{props.name}</Text> | |
| </View> | |
| ); | |
| }); | |
| type ComponentFC = ComponentFCRef; | |
| export default function RefExample() { | |
| const componentCRef = useRef<ComponentC>(null); | |
| const componentFCRef = useRef<ComponentFC>(null); | |
| return ( | |
| <View | |
| style={{ backgroundColor: 'white', flex: 1, padding: 20, margin: 20 }} | |
| > | |
| <ComponentC name="Component1" ref={componentCRef} /> | |
| <ComponentFC name="Component1" ref={componentFCRef} /> | |
| <Button | |
| title="try" | |
| onPress={() => { | |
| console.log(' => try pressed'); | |
| componentCRef.current?.doSomething(); | |
| componentFCRef.current?.doSomething(); | |
| }} | |
| /> | |
| </View> | |
| ); | |
| } |
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