Alamofire provides a method to check network status reachable on WWAN, Ethernet and wifi. The NetworkReachabilityManager class provided by Alamofire listens whenever there is a change in network.

It can be used to determine background information and reasons why a network operation failed and retries network requests when a connection is established. We can use reachability listeners to perform background tasks whenever a network is reachable.

Here are steps to start network reachability listener:

1- Initialise NetworkReachabilityManager with a host to evaluate network; Here we are using www.google.com for now, you can use your own.

let manager = NetworkReachabilityManager(host: "www.google.com")

        
2 A closure to be executed when there is a change in network status.

 manager?.listener = { status in
            
            	print("Network Status Changed: \(status)")
            	print("network reachable \(manager!.isReachable)")
				                print(You can do your code here)
        }

3- Start listening the network change.

manager?.startListening()

	startlistening method will start looking for changes in network status.

To stop the listener use method below:

manager?.stopListening()

‘stopListening’ method will stop looking for changes in network status. Here ‘manager’ is NetworkReachabilityManager objects initialised in 1st step.

Code Snippet:

let manager = NetworkReachabilityManager(host: "www.google.com")
manager?.listener = { status in
            
            print("Network Status Changed: \(status)")
            print("network reachable \(manager!.isReachable)")
        }
 manager?.startListening()