Check internet availability in Swift

Internet Availability

It’s mandatory for all applications to check internet connection is available or not. So you can check the internet availability by using SCNetworkReachability API of  SystemConfiguration Framework which is by default provided in iOS, You do not have to use any third party library for that.Follow these steps to check internet availability:-

• Create a new Swift file with name InternetTest.
• Then you have to import the SystemConfiguration framework.
  
  Swift

  import SystemConfiguration

  1	import SystemConfiguration

• Write the following code to InternetTest file to test your internet connection.
  
  Swift

  import Foundation import SystemConfiguration public class ReachabilityTest { class func isConnectedToNetwork() -> Bool { var zeroAddress = sockaddr_in() zeroAddress.sin_len = UInt8(MemoryLayout.size(ofValue: zeroAddress)) zeroAddress.sin_family = sa_family_t(AF_INET) let defaultRouteReachability = withUnsafePointer(to: &zeroAddress) { $0.withMemoryRebound(to: sockaddr.self, capacity: 1) {zeroSockAddress in SCNetworkReachabilityCreateWithAddress(nil, zeroSockAddress) } } var flags = SCNetworkReachabilityFlags() if !SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) { return false } let isReachable = (flags.rawValue & UInt32(kSCNetworkFlagsReachable)) != 0 let needsConnection = (flags.rawValue & UInt32(kSCNetworkFlagsConnectionRequired)) != 0 return (isReachable && !needsConnection) } }

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  import Foundation import SystemConfiguration   public class ReachabilityTest {          class func isConnectedToNetwork() -> Bool {                  var zeroAddress = sockaddr_in()         zeroAddress.sin_len = UInt8(MemoryLayout.size(ofValue: zeroAddress))         zeroAddress.sin_family = sa_family_t(AF_INET)           let defaultRouteReachability = withUnsafePointer(to: &zeroAddress) {             $0.withMemoryRebound(to: sockaddr.self, capacity: 1) {zeroSockAddress in                 SCNetworkReachabilityCreateWithAddress(nil, zeroSockAddress)             }         }           var flags = SCNetworkReachabilityFlags()         if !SCNetworkReachabilityGetFlags(defaultRouteReachability!, &flags) {             return false         }         let isReachable = (flags.rawValue & UInt32(kSCNetworkFlagsReachable)) != 0         let needsConnection = (flags.rawValue & UInt32(kSCNetworkFlagsConnectionRequired)) != 0         return (isReachable && !needsConnection)       }      }

• Now you have to check that internet connection is available or not.
  
  Swift

  if ReachabilityTest.isConnectedToNetwork() { print("Internet connection available") } else{ print("No internet connection available") }

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  if ReachabilityTest.isConnectedToNetwork() {     print("Internet connection available") } else{    print("No internet connection available") }