当我按下按钮时没有调用方法 [英] Method is not being invoked when i press the button

问题描述

我正在使用 React 导航并在右侧添加了一个按钮以使用默认导航选项从我的应用程序注销，如下所示:

I am using react navigation and have added a button on the right to signout from my app using default navigation options as shown below :

const otherApp = createStackNavigator({
  Welcome : { 
    screen : WelcomeScreen
  }
},
{
  defaultNavigationOptions : ({navigation}) => ({
    title : 'Welcome',
    headerStyle: {
      backgroundColor: '#29434e',
      shadowColor: 'transparent',
      elevation: 0
    },
    headerRight: (
      <TouchableOpacity
        style={{ backgroundColor: '#DDDDDD', padding: 5 }}
        onPress={() => navigation.getParam('logout')}>
        <Text
          style={{
            fontSize: 10,
          }}>
          Logout
        </Text>
      </TouchableOpacity>
    ),
  })
});

我正在绑定要调用的方法，如下所示:

And i am binding the method to be invoked as follows :

_Logout() {
    this.props.signOut();
  }
  componentDidMount(){
    this.props.navigation.setParams({ logout : this._Logout.bind(this) })
  }

使用 redux 将函数映射到 props

Function is maped to props using the redux

const mapDispatchToProps = (dispatch) => {
  return {
    Signout : ()=> dispatch(Signout())
  }
}

但问题是当我按下按钮时，它没有调用该方法！

But the problem is when i press the button, it does not invoke the method !

推荐答案

我得到了解决方案，我做错了什么，我没有在按钮的 onPress 中传递回电！

I got the solution, what i was doing wrong that i wasn't passing a call back in the onPress of the button !

logoutFromFirebase = () => {
    this.props.Signout();
    this.props.navigation.navigate(this.props.user.uid ? 'App' : 'Auth')
  }
  componentDidMount(){
    this.props.navigation.setParams({ logout : this.logoutFromFirebase })
  }

和默认导航

defaultNavigationOptions : ({navigation}) => ({
    title : 'Welcome',
    headerStyle: {
      backgroundColor: '#29434e',
      shadowColor: 'transparent',
      elevation: 0
    },
    headerRight: (
      <TouchableOpacity
        style={{ backgroundColor: '#DDDDDD', padding: 5 }}
        onPress={navigation.getParam('logout' , () => Reactotron.log('Logout not callled'))}>
        <Text
          style={{
            fontSize: 10,
          }}>
          Logout
        </Text>
      </TouchableOpacity>
    ),
  })

现在它工作正常！

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