IOS Real-time monitoring network status change _ios

In the network application, sometimes needs to the user equipment network state to carry on the real-time monitoring, has two purposes:
(1) Let users understand their own network status, to prevent some misunderstandings (such as the use of strange applications incompetent)
(2) According to the user's network status of intelligent processing, save user traffic, improve user experience
WiFi network: Automatically download HD images
4G/3G network: Download only thumbnails
No network: Only offline cached data is displayed

The following two methods are commonly used:
(1), using the Apple method to detect the iOS device network environment for the library reachablity
(2), using the Afnetworkreachabilitymanager in the AFN frame to monitor the change of the network state

First, Apple has provided a sample program called reachability, which makes it easier for developers to detect network status
Please download the sample from Apple Web site before use: http://xiazai.jb51.net/201608/yuanma/Reachability (jb51.net). rar

Then add Reachability.h and REACHABILITY.M to your project and refer to Systemconfiguration.framework, which you can use.
3 network states are defined in reachability:

typedef enum:nsinteger {

  notreachable = 0,//no connection
  Reachableviawifi,//Use 3G/GPRS network
  Reachableviawwan// Use WiFi network

} networkstatus;

We can start real-time monitoring after the program starts.

APPDELEGATE.M @interface appdelegate () @property (nonatomic, strong) reachability *reachability; @end//program initiator, start network monitoring-(void) applicationdidfinishlaunching: (uiapplication *) application {//Set up network detection site NSString *r
  Emotehostname = @ "www.apple.com";
  self.reachability = [reachability reachabilitywithhostname:remotehostname];
                       To set the notification function when network state changes [[Nsnotificationcenter defaultcenter] addobserver:self selector: @selector (reachabilitychanged:)
  name:@ "Knetworkreachabilitychangednotification" object:nil];
[Self updatestatus];
  }-(void) Reachabilitystatuschange: (nsnotification *) Notification {reachability* Curreach = [Notification Object];
  Nsparameterassert ([Curreach iskindofclass:[reachability class]);
[Self Updateinterfacewithreachability:curreach]; }-(void) Updateinterfacewithreachability: (reachability *) reachability {if (reachability = = _reachability) {Net
    Workstatus netstatus = [reachability currentreachabilitystatus]; SwitcH (netstatus) {case notreachable: {NSLog (@ "No network!)
        ");
      Break
        Case Reachableviawwan: {NSLog (@ "4g/3g");
      Break
        Case Reachableviawifi: {NSLog (@ "WiFi");
      Break
  }}-(void) Dealloc {[_reachability stopnotifier];
[[Nsnotificationcenter Defaultcenter] removeobserver:self name:kreachabilitychangednotification Object:nil]; 

 }

Two, use the Afnetworkreachabilitymanager in the AFN frame to listen for changes to the state of the network

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