nav bar shows when app goes back to foreground

[l12ab]

1. scroll up hide nav bar
2. press home button let app into background
3. and then press again

oh, the nav bar appears, this is what i dont expected

[galvana]

To fix this issue I added some logic to the default case for applicationWillEnterForeground. It expands or contracts the views based on the currentState.

func applicationWillEnterForeground() {
    switch onForegroundAction {
    case .show:
        _ = navBarController.expand()
        _ = tabBarController?.expand()
    case .hide:
        _ = navBarController.contract()
        _ = tabBarController?.contract()
    default:
        switch currentState {
        case .Open, .Expanding:
            _ = navBarController.expand()
            _ = tabBarController?.expand()
        case .Closed, .Contracting:
            _ = navBarController.contract()
            _ = tabBarController?.contract()
        }
    }
}