I have some swift code which uses the Network framework to detect when network connectivity is available or not. If I have wifi turned on and I run my code my code reports that path.status is .satisfied and if I then turn off my wifi my code reports that path.status is .satisfied again. But then if I turn on my wifi again path.status is reported as .unsatisfied then a second later it reports it as .satisfied. What on earth is going on? I would expect path.status to change immediately when wifi is turned off and on and off etc.

Here is my NetworkServices class;

final class NetworkServices {
    
    static let sharedInstance = NetworkServices()
        
    private let queue = DispatchQueue.global(qos: .background)
    
    private let monitor: NWPathMonitor
    
    public private(set) var isConnected: Bool = false
    
    public private(set) var connectionType: ConnectionType = .unknown
    
    enum ConnectionType {
        case wifi
        case cellular
        case wiredEthernet
        case unknown
    }
    
    private init() {
        monitor = NWPathMonitor()
    }
    
    public func startMonitoring() {
        monitor.start(queue: queue)
        monitor.pathUpdateHandler = { [weak self] path in
            self?.isConnected = path.status == .satisfied
            print("DEBUG: path.status = \(path.status); isConnected = \(self!.isConnected)")
            self?.getConnectionType(path)
        }
    }
    
    public func stopMonitoring() {
        monitor.cancel()
    }
    
    private func getConnectionType(_ path: NWPath) {
        if path.usesInterfaceType(.wifi) {
            connectionType = .wifi
        } else if path.usesInterfaceType(.cellular) {
            connectionType = .cellular
        } else if path.usesInterfaceType(.wiredEthernet) {
            connectionType = .wiredEthernet
        } else {
            connectionType = .unknown
        }
    }
}

I call the startMonitoring method in my AppDelegate file's didFinishLaunchingWithOptions method

CodePudding user response：

As you turn on wifi, It notify for NWPath update but until then connection has not been established, it takes some moment to connect.

CodePudding user response：

The pathUpdateHandler does not work properly in an iOS simulator but works as expected on a real device.