Request ViewBinding final class RequestListViewModel { lazy var stateChangedObserver = Bond { [weak self] state in switch state { case .Requesting: UIApplication.sharedApplication().networkActivityIndicatorVisible = true default: UIApplication.sharedApplication().networkActivityIndicatorVisible = false } } init() { requestListState ->| stateChangedObserver } OFUXPSL"DUJWJUZ*OEJDBUPS7JTJCMFΛ4UBUFͰ#JOEJOH