问题描述
我使用 stackNavigator 在屏幕之间导航.我在第二个活动的 componentDidMount() 函数中调用了两个 API.当我第一次加载它时，它被成功加载.然后我按后退按钮返回第一个活动.然后，如果我再次进入第二个活动，则不会调用 API 并且出现渲染错误.我无法为此找到任何解决方案.任何建议将不胜感激.
I am using stackNavigator for navigating between screens. I am calling two API's in componentDidMount() function in my second activity. When i load it first time, it gets loaded successfully. Then i press back button to go back to first activity. Then, if i am again going to second activity, the APIs are not called and I get render error. I am not able to find any solution for this. Any suggestions would be appreciated.
推荐答案
如果有人在 2019 年来到这里，试试这个:
If anyone coming here in 2019, try this:
import {NavigationEvents} from 'react-navigation';
将组件添加到您的渲染中:
Add the component to your render:
<NavigationEvents onDidFocus={() => console.log('I am triggered')} />
现在，这个 onDidFocus 事件将在每次页面获得焦点时触发，尽管来自 goBack() 或导航.
Now, this onDidFocus event will be triggered every time when the page comes to focus despite coming from goBack() or navigate.
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