如何使用 React Navigation 导航到渲染函数之外的新屏幕,而不使用 JSX?

How do I use React Navigation to navigate to a new screen outside of the render function, and not using JSX?

我对 React、React Native 和 React Navigation 还很陌生。取得了一些进展,但 运行 进入了这个问题。

通常我会通过如下方式导航到新页面:

<Button
  text='View Details' onPress={() => 
  this.props.navigation.navigate('AccountScreen')} />

但是,我目前正在尝试导航到 .fetch() 中的新屏幕,想知道我需要做些什么不同的事情。

查看下面的代码:

// AppNavigation.js:
...
const PrimaryNav = StackNavigator({
  HomeScreen: { screen: HomeScreen },
  AccountScreen: { screen: AccountScreen }
});



// HomeScreen.js
...
handlePress = (navigator) => {

  fetch('https://example.com/this/url/works' + this.state.accountName, lookUpObject ).then( function(response) {
    if(response.ok) {

      // this does not work. 
      // returns this error:
      // "undefined is not an object (evaluating 'navigator.navigate')"
      navigator.navigate( 'AccountScreen', { "accountName": this.state.accountName } );
    }
  })

}

render () {
  const { navigate } = this.props.navigation;

  reutrn (
    <ButtonCTA onPress={this.handlePress}>Go to account page</ButtonCTA>
  )
}

现在我收到以下错误: "undefined is not an object (evaluating 'navigator.navigate')"

您只是忘记将导航器传递给 handlePress 您的按钮代码应如下所示:

<ButtonCTA onPress={ ()=>this.handlePress(this.props.navigation) }>Go to account page</ButtonCTA>