React-navigation Routing Level login interception

Routing stacks

Const Navigator = stacknavigator ({
    Setting: {screen:settingscreenview},
    ...
});

1. Set Routing status Change Intercept

function Getcurrentroutename (navigationstate) {
    if (!navigationstate) {
        return null;
    }
    Const route = Navigationstate.routes[navigationstate.index];
    Dive into nested navigators
    if (route.routes) {
        return getcurrentroutename (route);
    }
    return route.routename;
}


Class Startscreen extends Component {
    render () {
        const prefix = Platform.os = = ' Android '? ' xx://aa/': ' xx://';
        Return (
            <navigator uriprefix={prefix}
                onnavigationstatechange={
                    (prevstate, currentstate) = {
                        Const Currentscene = getcurrentroutename (currentstate);
                        if (Currentscene = = ' Setting ') {
                        //To do something
                    }
                } 
            />);
    }

2. Login Jump Intercept

The route to intercept logins is const NEEDLOGINROUTE = [' Setting '];

Const Defaultgetstateforaction = StartScreen.router.getStateForAction;
    StartScreen.router.getStateForAction = (action, state) + = {Let RouteName = Dealmsgdeal (action.routename); Intercept needs to log in after the jump is also not if (action.routename = = = RouteName && IsLogin = = False) {this.routes = [...] 
        . state.routes, {key: ' id-' +date.now (), RouteName: ' Login ', params: {name:routename, params:action.params}},
        ];
    Return {... state, routes, Index:this.routes.length-1,};
} return Defaultgetstateforaction (action, state);


};
    Required to intercept login page function dealmsgdeal (routeName) {Let theroutename = '; if (RouteName) {for (var i in Needloginroute) {if (needloginroute[i] = = routeName) {T
                Heroutename = RouteName;
            Break
}}} return theroutename; }