TypeError: undefined is not a fu

原因是react 16将createClass移除了，使用es6语法，如果必须使用es5创建类的话，请使用create-react-class包,请参考

var React = require("react");
var createReactClass = require('create-react-class');
import {
    StyleSheet,
    View,
    Text
} from 'react-native';

var MyComponent = createReactClass({
    render() {
        return (
            <View style={styles.container}>
                <Text>Hello World</Text>
            </View>
        )
    }
});

const styles = StyleSheet.create({
    container: {
        display: 'flex',
        flex: 1,
        backgroundColor: '#ccc'
    }
});
module.exports = MyComponent;