Question

我试图从另一个方法调用一个方法，我得到了错误＆＃34; writeUserData＆＃34;没有定义。这是我的代码：

export default class RegisterScreen extends Component{

  constructor(props){
    super(props)
    this.state = {
      email: '',
      password: '',
      verify: '',
      nickname: '',
    }

    this.handlePress = this.handlePress.bind(this)
    this.writeUserData = this.writeUserData.bind(this)
  }

  handlePress(navigation){
    if(this.state.password == this.state.verify){
      firebaseRef.auth().createUserWithEmailAndPassword(this.state.email, this.state.password).then(function(newUser){
        const resetAction = NavigationActions.reset({
          index: 0,
          actions: [
            NavigationActions.navigate({ routeName: 'Home'})
          ]
        })

        navigation.dispatch(resetAction)
        writeUserData(newUser.uid, this.nickname); //Problem here.
      }).catch(function(error){
        console.log(error);
      });
    }else{
      //password not match, show error.
    }
  }

  writeUserData(mUID, mNickname){
    console.log("WRITE");
    firebaseRef.database().ref('users/' + mUID + '/').set({
      nickname: mNickname,
    });
  }
}

我尝试在注册到数据库后编写用户的昵称和UID。我使用的是Firebase和React Native。

我也试过写这个.writeUserData，但是我得到一个错误说＆＃34; this.writeUserData＆＃34;不是一个功能。

我做错了什么，我该如何解决？

提前致谢！

Answer 1

如果你使用箭头功能，它会将this的引用更改为你的类，这将让你使用你的方法：

handlePress = (navigation) => { //this also makes it so you dont have to bind in constructor
    if(this.state.password == this.state.verify){
      firebaseRef.auth().createUserWithEmailAndPassword(this.state.email, this.state.password).then((newUser) => { //arrow function here
        const resetAction = NavigationActions.reset({
          index: 0,
          actions: [
            NavigationActions.navigate({ routeName: 'Home'})
          ]
        })

        navigation.dispatch(resetAction)
        this.writeUserData(newUser.uid, this.nickname); //Problem here.
      }).catch(function(error){
        console.log(error);
      });
    }else{
      //password not match, show error.
    }
  }

我的方法没有定义

1 个答案: