react native的ref使用例子

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/**
* Create by bamboo on 2018-04-17
* ref例子
*/
import React,{ Component} from 'react';
import { StyleSheet,View,Text,TouchableOpacity} from 'react-native';

export default class RefTest extends Component {
constructor( props) {
super( props);
this. _button = null; //按钮
}
render() {
return (
@H_404_95@< View @H_404_95@>
@H_404_95@< TouchableOpacity style= {[{ width: 100,height: 30,backgroundColor: '#ff3',
borderRadius: 15,alignItems: 'center',justifyContent: 'center',}] }
onPress= {this. _onButtonPress. bind( this) }
ref= { button => this. _button = button } @H_404_95@>
@H_404_95@< Text @H_404_95@>Ref 测试 @H_404_95@</ Text @H_404_95@>
@H_404_95@</ TouchableOpacity @H_404_95@>
@H_404_95@< View @H_404_95@>
@H_404_95@< Text ref= "textId" @H_404_95@>我是Text @H_404_95@</ Text @H_404_95@>
@H_404_95@</ View @H_404_95@>
@H_404_95@</ View @H_404_95@>
);
}

_onButtonPress = () =>{
if ( this. _button && this. _button. measure) {
this. _button. measure(( fx,fy,width,height,px,py) => {
console. log( "fx="+ fx + "|fy="+ fy+ "|width="+ width+ "|height="+ height + "|px="+ px + "|py=" + py);
});
}
this. refs. textId. setNativeProps({
style:{
color: 'blue',
fontSize: 30
}
});
}
}

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