获取屏幕尺寸
const window = Dimensions.get('window');
const screenHeight = Platform.OS === 'ios' ? window.height : window.height - StatusBar.currentHeight;
const screenWidth = window.width;

在代码中动态获取View的尺寸

ref={(ref) => this.buttonRef = ref}

UIManager.measure(findNodeHandle(this.buttonRef), (x, y, width, height, pageX, pageY) => {
console.log('width:::::' + width);
this.setState({
popWidth: width,
});

});

Dimensions,
StatusBar,
UIManager,
findNodeHandle
都是'react-native'的导入

什么时候使用双引号,/ 单引号

两种方式有什么不同

renderImage = ({item}) => (

);

spinner() {
return (

);
}