swift基础判断网络连接

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  1. import Foundation
  2. import SystemConfiguration
  3.  
  4. public class Reachability {
  5. class func isConnectedToNetwork() -> Bool {
  6. var zeroAddress = sockaddr_in(sin_len: 0,sin_family: 0,sin_port: 0,sin_addr: in_addr(s_addr: 0),sin_zero: (0,0))
  7. zeroAddress.sin_len = UInt8(sizeofValue(zeroAddress))
  8. zeroAddress.sin_family = sa_family_t(AF_INET)
  9. let defaultRouteReachability = withUnsafePointer(&zeroAddress) {
  10. SCNetworkReachabilityCreateWithAddress(nil,UnsafePointer($0))
  11. }
  12. var flags: SCNetworkReachabilityFlags = []
  13. if SCNetworkReachabilityGetFlags(defaultRouteReachability!,&flags) == false {
  14. return false
  15. }
  16. let isReachable = flags.contains(.Reachable)
  17. let needsConnection = flags.contains(.Connectionrequired)
  18. return isReachable && !needsConnection
  19. }
  20. }

  1. class ViewController: UIViewController {
  2.  
  3. @IBOutlet weak var checkingLabel: UILabel!
  4. override func viewDidAppear(animated: Bool) {
  5. checkConnectivity()
  6. }
  7. override func viewDidLoad() {
  8. super.viewDidLoad()
  9. }
  10.  
  11. override func didReceiveMemoryWarning() {
  12. super.didReceiveMemoryWarning()
  13. }
  14.  
  15. func checkConnectivity() {
  16. print(Reachability.isConnectedToNetwork(),terminator: "")
  17. if Reachability.isConnectedToNetwork() == false {
  18. let alert = UIAlertController(title: "Alert",message: "Internet is not working",preferredStyle: UIAlertControllerStyle.Alert)
  19. self.presentViewController(alert,animated: false,completion: nil)
  20. let okAction = UIAlertAction(title: "Retry",style: UIAlertActionStyle.Default) {
  21. UIAlertAction in
  22. alert.dismissViewControllerAnimated(false,completion: nil)
  23. //self.checkConnectivity()
  24. }
  25. alert.addAction(okAction)
  26. checkingLabel.text = ""
  27. }
  28. else {
  29. checkingLabel.text = "Connected"
  30. }
  31. }
  32. }
没网没有网的时候回弹出警告框

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