How do I know if cellular access for my iOS app is disabled?

Question

I have an iOS app that makes some small network requests on app launch (resource updates, etc). If the user turns off cellular access for the app in iOS Settings, they get

Answer 1

I have found that the CTCellularData class needs some time to get to the correct value. In my implementation I call the didUpdateNotifier very early after appDidFinishLaunching. By the time my networking call are returning with errors I definitely have a correct value for the restricted state.

class CellularRestriction: NSObject {
    private static var cellularData = CTCellularData()
    private static var currentState = CTCellularDataRestrictedState.restrictedStateUnknown

    static var isRestricted: Bool {
        currentState = cellularData.restrictedState
        return currentState == .restricted
    }

    static func prepare() {
        if currentState == .restrictedStateUnknown {
            cellularData.cellularDataRestrictionDidUpdateNotifier = { state in
                currentState = cellularData.restrictedState // This value may be inconsistent, however the next read of isRestricted should be correct.
            }
        }
    }
}