react-native - 如何在点击事件中获取 React Native 中的元素属性

Question

我应该如何在不使用 React Native 中的“this”关键字的情况下访问元素的属性？我有一个函数，父类本身绑定(bind)为“this”，但我想访问正在单击的元素的属性。这是代码-

import {Circle} from 'react-native-svg';
export default App extends Component {
  constructor(props) {
  super(props);
  this.state = {activeX: null}
 }

 handleTouch(event) {
   const x = event.target.cx; //How to access "cx" property here?
   this.setState({ activeX: x });
 }

 render() {
   return (
     <Circle cx='10' cy='10' r='5' onPress={this.handleTouch.bind(this)}/>
     <Circle cx='20' cy='20' r='5' onPress={this.handleTouch.bind(this)}/>
   );
 }
}

Answer 1

试试这个

import {Circle} from 'react-native-svg';
export default App extends Component {
  constructor(props) {
  super(props);
  this.state = {
    activeX: null,
    cx: 10
  }
 }

 handleTouch = () => {
   const x = this.state.cx
   this.setState({ activeX: x });
 }

 render() {
   return (
     <Circle cx={this.state.cx} cy='10' r='5' onPress={this.handleTouch}/>

   );
 }
}