你的逻辑应该遵循这个：
class MyStartingComponent extends React.Component {
constructor(){
super();
this.state = {firstLaunch: null};
}
componentDidMount(){
AsyncStorage.getItem("alreadyLaunched").then(value => {
if(value == null){
AsyncStorage.setItem('alreadyLaunched',true); // No need to wait for `setItem` to finish,although you might want to handle errors
this.setState({firstLaunch: true});
}
else{
this.setState({firstLaunch: false});
}}) // Add some error handling,also you can simply do this.setState({fistLaunch: value == null})
}
render(){
if(this.state.firstLaunch === null){
return null; // This is the 'tricky' part: The query to AsyncStorage is not finished,but we have to present something to the user. Null will just render nothing,so you can also put a placeholder of some sort,but effectively the interval between the first mount and AsyncStorage retrieving your data won't be noticeable to the user.
}else if(this.state.firstLaunch == true){
return <FirstLaunchComponent/>
}else{
return <NotFirstLaunchComponent/>
}
}
希望能帮助到你
