如何将类包装在高阶组件中？

Question

我想知道是否可以将一个类组件包装在一个也有一个类的 hoc 中。

import React, { Component } from "react";
import { View } from "react-native";
import { Toast } from "react-native-easy-toast";
const withToast = EnhancedComponent => {
    return class HOC extends Component {
        render() {
            return (
                <View>
                    <EnhancedComponent {...this.props} toast={(message, duration) => this.toast.show(message, duration)} />
                    <Toast
                        ref={toast => {
                            this.toast = toast;
                        }}
                    />
                </View>
            );
        }
    };
};
export default withToast;

这是我正在使用的 hoc，现在我正在传递一个像这样的类组件：

import React, { Component } from "react";
import withToast from "../../hoc/withToast";
import Btn from "react-native-micro-animated-button";
class Login extends Component<Props> {
render() {
            return <Btn title="Login" onPress={() => this.props.toast("logged in")} />;
        }
    }
export default withToast(Login);

当我运行它时，我得到了这个错误：

Invariant Violation: Invariant Violation: Invariant Violation: Element type is invalid: expected a string 
(for built-in components) or a class/function (for composite components) but got: undefined. 
You likely forgot to export your component from the file it's defined in, or you might have 
mixed up default and named imports.
Check the render method of `HOC`

有可能吗？

谢谢！

Answer 1

想通了。 我在进口 import { Toast } from "react-native-easy-toast"; 代替 import Toast from "react-native-easy-toast";