In iOS, Reachability is used to detect the network type of the mobile phone. Wi-Fi and 2 3 4G, iosreachability

In iOS, Reachability is used to detect the network type of the mobile phone. Wi-Fi and 2 3 4G, iosreachability

If you want to provide a Reeder In the iOS program, or provide offline mode (Evernote) in the absence of a network ). Then you will use the Reachability for network detection.

 

Purpose of writing this article

• Understand what Reachability can do
• Detection 3 network environment
• 2G/3G
• Wifi
• No network
• How to Use notifications
• Single controller
• Multiple Controllers
• Simple functions:
• Use only in wifi

Reachability Overview

Reachablity is a library used for iOS device network environment detection.

• Monitor whether the target network is available
• Monitor the connection mode of the current network
• Monitor connection mode changes

Doc officially provided by Apple

Http://developer.apple.com/library/ios/#samplecode/Reachability/Introduction/Intro.html

 

Github documentation

Https://github.com/tonymillion/Reachability

 

Install

Because Reachability is very common. Add it directly to Supporting Files/networ-Prefix.pch:

 

C code

1. # Import <Reachability/Reachability. h>

 

If you do not know what cocoaspod is, check the following:

Http://witcheryne.iteye.com/blog/1873221

 

Use

There is an answer in stackoverflow to explain the reachability usage.

Http://stackoverflow.com/questions/11177066/how-to-use-ios-reachability

• Generally, a Reachability instance is OK.
• Only one Reachability is required for a Controller.

Block

 

C code

1. -(Void) viewDidLoad
2. {
3. [Super viewDidLoad];
4. DLog (@ "enable www.apple.com network detection ");
5. Reachability * reach = [Reachability reachabilityWithHostname: @ "www.apple.com"];
6. DLog (@ "-- current status: % @", reach. currentReachabilityString );
8. // Start the notifier which will cause the reachability object to retain itself!
10. [[Nsicationcenter center defacenter center] addObserver: self
11. Selector: @ selector (reachabilityChanged :)
12. Name: kReachabilityChangedNotification
13. Object: nil];
15. Reach. reachableBlock = ^ (Reachability * reachability)
16. {
17. Dispatch_async (dispatch_get_main_queue (), ^ {
18. Self. blockLabel. text = @ "network available ";
19. Self. blockLabel. backgroundColor = [UIColor greenColor];
20. });
21. };
23. Reach. unreachableBlock = ^ (Reachability * reachability)
24. {
25. Dispatch_async (dispatch_get_main_queue (), ^ {
26. Self. blockLabel. text = @ "Network unavailable ";
27. Self. blockLabel. backgroundColor = [UIColor redColor];
28. });
29. };
31. [Reach startNotifier];
32. }

 

 

Notification

 

C code

1. -(Void) viewDidLoad
2. {
3. [Super viewDidLoad];
4. DLog (@ "enable www.apple.com network detection ");
5. Reachability * reach = [Reachability reachabilityWithHostname: @ "www.apple.com"];
6. DLog (@ "-- current status: % @", reach. currentReachabilityString );
8. // Start the notifier which will cause the reachability object to retain itself!
10. [[Nsicationcenter center defacenter center] addObserver: self
11. Selector: @ selector (reachabilityChanged :)
12. Name: kReachabilityChangedNotification
13. Object: nil];
14. [Reach startNotifier];
15. }
17. -(Void) reachabilityChanged: (NSNotification *) note {
18. Reachability * reach = [note object];
20. If (! [Reach isReachable])
21. {
22. Self. icationicationlabel. text = @ "Network unavailable ";
23. Self. icationicationlabel. backgroundColor = [UIColor redColor];
24. Self. wifiOnlyLabel. backgroundColor = [UIColor redColor];
25. Self. wwanOnlyLabel. backgroundColor = [UIColor redColor];
26. Return;
27. }
29. Self. icationicationlabel. text = @ "network available ";
30. Self. icationicationlabel. backgroundColor = [UIColor greenColor];
32. If (reach. isReachableViaWiFi ){
33. Self. wifiOnlyLabel. backgroundColor = [UIColor greenColor];
34. Self. wifiOnlyLabel. text = @ "currently connected via wifi ";
35. } Else {
36. Self. wifiOnlyLabel. backgroundColor = [UIColor redColor];
37. Self. wifiOnlyLabel. text = @ "wifi is not enabled and cannot be used ";
38. }
40. If (reach. isReachableViaWWAN ){
41. Self. wwanOnlyLabel. backgroundColor = [UIColor greenColor];
42. Self. wwanOnlyLabel. text = @ "currently connected through 2g or 3g ";
43. } Else {
44. Self. wwanOnlyLabel. backgroundColor = [UIColor redColor];
45. Self. wwanOnlyLabel. text = @ "2g or 3g network not used ";
46. }
47. }

 

 

Appendix demo description enable wifi

Disable wifi status

 

 

 

Legacy problems