RN 获取屏幕尺寸

//引入
var Dimensions = require('Dimensions');
export  default  class  Test4 extends Component{
  render(){
    return(
        <View style={styles2.container}>
          <Text>当前屏幕宽度:{Dimensions.get('window').width}</Text>
          <Text>当前屏幕高度:{Dimensions.get('window').height}</Text>
          <Text>当前屏幕的分辨率:{Dimensions.get('window').scale}</Text>
        </View>
    );
  }
}

或者简化版

var {width,height} = require('Dimensions').get('window');