Sometimes, after setState in react native or react, then use console.log to check the state, the state is not updated, that’s due to the mechanism of React.

According to the documentation:

setState() does not always immediately update the component. It may batch or defer the update until later. This makes reading this.state right after calling setState() a potential pitfall. Instead, use componentDidUpdate or a setState callback (setState(updater, callback))

this.setState({someKey: keyValue}, ()=>{
    alert(this.state.someKey);
});