基于AFNetworking的网络判断【原创】

首先导入AFNetworking第三方框架，然后将下面的.h和.m放在你新建的类中便可

GGNetworkJudge.h   在最后会有Singleton.h头文件代码

 #import <Foundation/Foundation.h>
 #import "AFNetworkReachabilityManager.h"
 #import "Singleton.h" //此处是将一个普通类转化为单例类的头文件

 @interface GGNetworkJudge : NSObject

 singleton_interface(GGNetworkJudge);

 //监测网络状态
 - (void)checkNetworkStatus;

 @end

GGNetworkJudge.m

 #import "GGNetworkJudge.h"
 #import <UIKit/UIKit.h>

 @implementation GGNetworkJudge
 singleton_implementation(GGNetworkJudge);

 #pragma mark - 私有方法
 #pragma mark 网络状态变化提示
 -(void)alert:(NSString *)message{
     UIAlertView *alertView=[[UIAlertView alloc]initWithTitle:@"系统信息" message:message delegate:nil cancelButtonTitle:@"确定" otherButtonTitles: nil];
     [alertView show];
 }

 #pragma mark 网络状态监测
 -(void)checkNetworkStatus{

     AFNetworkReachabilityManager *manager = [AFNetworkReachabilityManager sharedManager];

     //开始监控
     [manager startMonitoring];

     // 检测网络连接的单例,网络变化时的回调方法
     [manager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {

         switch (status) {
             case AFNetworkReachabilityStatusReachableViaWWAN:
                 //[self alert:@"2G/3G/4G Connection."];
                 [self alert:@"网络已连接"];

                 break;
             case AFNetworkReachabilityStatusReachableViaWiFi:
                 // [self alert:@"WiFi Connection."];

                 [self alert:@"网络已连接"];
                 break;
             case AFNetworkReachabilityStatusNotReachable:
                 //  [self alert:@"Network not found."];
                 [self alert:@"网络已断开，请检查网络设置"];

                 break;

             default:
                 // [self alert:@"Unknown."];
                 [self alert:@"网络未知错误"];

                 break;

         }

     }];

 }

 @end

Singleton.h

 /*
 专门用来保存单例代码
  最后一行不要加 \
 */

 // @interface
 #define singleton_interface(className) \
 + (className *)shared##className;

 // @implementation
 #define singleton_implementation(className) \
 static className *_instance; \
 + (id)allocWithZone:(NSZone *)zone \
 { \
     static dispatch_once_t onceToken; \
     dispatch_once(&onceToken, ^{ \
         _instance = [super allocWithZone:zone]; \
     }); \
     return _instance; \
 } \
 + (className *)shared##className \
 { \
     static dispatch_once_t onceToken; \
     dispatch_once(&onceToken, ^{ \
         _instance = [[self alloc] init]; \
     }); \
     return _instance; \
 }