react native class component constructor
import React from 'react'; import { View, TextInput } from "react-native"; class App extends React.Component { constructor(props){ super(props); this.state = { name: "" } this.handleChange = this.handleChange.bind(this); } handleChange(text){ this.setState({ name: text }) console.log(this.props); } render() { return ( <View> <TextInput value={this.state.name} onChangeText={(text) =>this.handleChange(text)} /> </View> } } export default App;
componentDidUpdate
componentDidUpdate(prevProps, prevState) { if (prevState.pokemons !== this.state.pokemons) { console.log('pokemons state has changed.') } }
shouldcomponentupdate
shouldComponentUpdate(nextProps, nextState) { return true; }
shouldcomponentupdate default return
By default, shouldComponentUpdate returns true, but you can override it to return false for cases that you do not want a re-render.
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