所以我有一个如下格式的上下文:

class UserProvider extends Component {
    constructor(props) {
        super(props)

        this.initialize = (details) => {
            this.setState(state => {
                //Setting each item individually here
                //e.g state.a = details.a
            })
        }

        this.editA = () => {
            this.setState(state => {
                //change A here
            })
        }

        this.editB = () => {
            this.setState(state => {
                //Change B here
            })
        }

        this.state = {
            a: null,
            b: null,
            editA: this.editA,
            editB: this.editB
        }
    }

    render() {
        return (
            <User.Provider value={this.state}>
                {this.props.children}
            </User.Provider>
        )
    }
}

所以对于每个状态，我都有一个单独的函数来更新它。如果我只想更新单个状态，应该怎么做？