React Native：在静态函数内访问组件状态

Question

I have a component defined like this

export class A extends Component{
   constructor(props){
     this.state = {
        scene:0
     }
   }
  static changeScene(scene){
     this.setState({scene:scene})
  }
}

I want to call change scene from anywhere using A.changeScene(sceneVal) to change the scene in A. the problem is i can't access this.setState i got this error Unhandled JS Exception: this.setState is not a function.

I am sure that the A component is already mounted. I can bypass this error by defining a global variable var self = null; and inside the constructor self = this in the constructor but i want a better way to rosolve this problem

Answer 1

Reason is, if you use static function then a static method won't be able to access this inside that function. You should avoid using static function. Static methods have no access to the values, properties, and methods defined on an instance of the class using this .

Check this article: http://odetocode.com/blogs/scott/archive/2015/02/02/static-members-in-es6.aspx