React Navigation无法在React Native App中与Firebase一起使用

Question

我有一个有趣的问题。

当我按下注册按钮时，以下功能在SignUp组件中调用。

//SignUp.js
signUpHandler = () => {
        if (this.state.email == '' || this.state.password == '') {
            alert("Email or Password is empty.")
        }
        else {
            firebase.auth().createUserWithEmailAndPassword(this.state.email, this.state.password)
                .then(() => this.props.navigation.navigate('ExtendedRegisteration'))
                .catch(error => { alert(error.message) });
        }
    }

现在，这不能导航到“ ExtendedRegisteration”，但是当我执行以下操作时，它就可以导航。

//SignUp.js
signUpHandler = () => {
        if (this.state.email == '' || this.state.password == '') {
            alert("Email or Password is empty.")
        }
        else {
                this.props.navigation.navigate('ExtendedRegisteration')
        }
    }

这是Firebase的问题吗？使用Firebase注册后，我需要导航至“ ExtendedRegisteration”。

sign.Handler中this.props的输出：

Object {
  "navigation": Object {
    "addListener": [Function addListener],
    "canGoBack": [Function canGoBack],
    "dangerouslyGetParent": [Function dangerouslyGetParent],
    "dangerouslyGetState": [Function anonymous],
    "dispatch": [Function dispatch],
    "goBack": [Function anonymous],
    "isFocused": [Function isFocused],
    "jumpTo": [Function anonymous],
    "navigate": [Function anonymous],
    "pop": [Function anonymous],
    "popToTop": [Function anonymous],
    "push": [Function anonymous],
    "removeListener": [Function removeListener],
    "replace": [Function anonymous],
    "reset": [Function anonymous],
    "setOptions": [Function setOptions],
    "setParams": [Function anonymous],
  },
  "route": Object {
    "key": "Sign Up-q-zIoH0VCp",
    "name": "Sign Up",
    "params": undefined,
  },
}

Answer 1

''这意味着上下文，这是最有趣的反应。尝试console.log（this.props）来检查Firebase中的道具是否与另一个示例相同。由于从诺言内部调用了this，因此可以更改“ this”上下文。它发生的时间超过了预期的时间。

您可以尝试创建函数

constructor(props){
    super(props);
    this._onUserCreation = this._onUserCreation.bind(this);
}

_onUserCreation=()=>{this.props.navigation.navigate('ExtendedRegisteration')};

//SignUp.js
signUpHandler = () => {
        if (this.state.email == '' || this.state.password == '') {
            alert("Email or Password is empty.")
        }
        else {
            firebase.auth().createUserWithEmailAndPassword(this.state.email, this.state.password)
                .then(() => this._onUserCreation())
                .catch(error => { alert(error.message) });
        }
    }

Answer 2

无论您从哪里调用注册功能并使用该参数代替它，都可以将其作为参数传递。