func handle(_ backgroundTasks: Set<WKRefreshBackgroundTask>) {
    for task in backgroundTasks {
        switch task {
        case let backgroundTask as WKApplicationRefreshBackgroundTask:
            scheduleNextReload()
            state.updateWeather();
            backgroundTask.setTaskCompletedWithSnapshot(false)
        default:
            task.setTaskCompletedWithSnapshot(false)
        }
    }
}

func scheduleNextReload() {
    let refreshTime = Date().advanced(by: 10)
    WKExtension.shared().scheduleBackgroundRefresh(
        withPreferredDate: refreshTime,
        userInfo: nil,
        scheduledCompletion: { _ in }
    )
}