#import <Foundation/Foundation.h>
#import <SystemConfiguration/SystemConfiguration.h>//! Project version number for MacOSReachability.
FOUNDATION_EXPORT double ReachabilityVersionNumber;//! Project version string for MacOSReachability.
FOUNDATION_EXPORT const unsigned char ReachabilityVersionString[];/** * Create NS_ENUM macro if it does not exist on the targeted version of iOS or OS X.** @see http://nshipster.com/ns_enum-ns_options/**/
#ifndef NS_ENUM
#define NS_ENUM(_type, _name) enum _name : _type _name; enum _name : _type
#endifextern NSString *const kReachabilityChangedNotification;//但前网络类型
typedef NS_ENUM(NSInteger, NetworkStatus) {// Apple NetworkStatus Compatible Names.NotReachable = 0,ReachableViaWiFi = 2,ReachableViaWWAN = 1
};@class Reachability;typedef void (^NetworkReachable)(Reachability * reachability);
typedef void (^NetworkUnreachable)(Reachability * reachability);
typedef void (^NetworkReachability)(Reachability * reachability, SCNetworkConnectionFlags flags);@interface Reachability : NSObject@property (nonatomic, copy) NetworkReachable    reachableBlock;
@property (nonatomic, copy) NetworkUnreachable  unreachableBlock;
@property (nonatomic, copy) NetworkReachability reachabilityBlock;@property (nonatomic, assign) BOOL reachableOnWWAN;//类方法创建网络监听对象
+(instancetype)reachabilityWithHostname:(NSString*)hostname;
// This is identical to the function above, but is here to maintain
//compatibility with Apples original code. (see .m)
+(instancetype)reachabilityWithHostName:(NSString*)hostname;
+(instancetype)reachabilityForInternetConnection;
+(instancetype)reachabilityWithAddress:(void *)hostAddress;
+(instancetype)reachabilityForLocalWiFi;//实例方法传附件网络监听对象
-(instancetype)initWithReachabilityRef:(SCNetworkReachabilityRef)ref;-(BOOL)startNotifier;     //开始监听网络
-(void)stopNotifier;      //停止监听网络-(BOOL)isReachable;        //是否没有网
-(BOOL)isReachableViaWWAN; //是否使自带的网络
-(BOOL)isReachableViaWiFi; //是否是WIFI// WWAN may be available, but not active until a connection has been established.
// WiFi may require a connection for VPN on Demand.
-(BOOL)isConnectionRequired; // Identical DDG variant.
-(BOOL)connectionRequired; // Apple's routine.
// Dynamic, on demand connection?
-(BOOL)isConnectionOnDemand;
// Is user intervention required?
-(BOOL)isInterventionRequired;-(NetworkStatus)currentReachabilityStatus;     //获取当前网络状态
-(SCNetworkReachabilityFlags)reachabilityFlags;//
-(NSString*)currentReachabilityString;//当前网络字符串
-(NSString*)currentReachabilityFlags; //当前网络标识@end

//  网络状态监听
//
//  Created by ma c on 16/01/29.
//  Copyright (c) 2016年 XYQ. All rights reserved.
//
#import "AppDelegate.h"
#import "Reachability.h"
@interface AppDelegate ()
@property(nonatomic,strong)Reachability *reachability; //网络监听对象
@end@implementation AppDelegate- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {//创建网络监听[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(networkStateChange) name:kReachabilityChangedNotification object:nil];//创建网络监听对象self.reachability = [Reachability reachabilityForInternetConnection];//self.reachablity = [Reachability reachabilityWithHostName:@"localhost"]; //本机网络//开始检测
    [self.reachability startNotifier];return YES;
}
//监听网络类型
-(void)NetWorkState
{if ([self.reachablity isReachableViaWiFi]) {NSLog(@"是WIFI");}else if([self.reachablity isReachableViaWWAN]){NSLog(@"是WWAN");}else{NSLog(@"没有网");}
}//网络链接改变时会调用的方法
-(void)reachabilityChanged:(NSNotification *)note
{[self NetWorkState];Reachability *currReach = [note object];NSParameterAssert([currReach isKindOfClass:[Reachability class]]);//对连接改变做出响应处理动作NetworkStatus status = [currReach currentReachabilityStatus];//如果没有连接到网络就弹出提醒实况self.isReachable = YES;if(status == NotReachable){UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"网络连接异常" message:@"暂无法访问" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil];[alert show];self.isReachable = NO;}else{UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"网络连接信息" message:@"网络连接正常" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil];[alert show];self.isReachable = YES;}
}-(void)dealloc
{//停止监听,并移除通知
    [self.reachablity stopNotifier];[[NSNotificationCenter defaultCenter]removeObserver:self];
}
@end

2016-01-29 16:20:18.779 网络状态监听[4854:325480] 是WIFI

typedef NS_ENUM(NSInteger, AFNetworkReachabilityStatus) {AFNetworkReachabilityStatusUnknown = -1,//未识别的网络

AFNetworkReachabilityStatusNotReachable = 0,//不可达的网络(未连接)

AFNetworkReachabilityStatusReachableViaWWAN = 1,//2G,3G,4G...

AFNetworkReachabilityStatusReachableViaWiFi = 2,//wifi网络

};

#import "AppDelegate.h"
#import <AFNetworking/AFNetworkReachabilityManager.h>@interface AppDelegate ()@property(nonatomic,strong)AFNetworkReachabilityManager *reachabilityManager;@end@implementation AppDelegate- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {//创建网络监控对象self.reachabilityManager = [AFNetworkReachabilityManager sharedManager];//设置监听[_reachabilityManager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {switch (status) {case AFNetworkReachabilityStatusUnknown:NSLog(@"未识别的网络");break;case AFNetworkReachabilityStatusNotReachable:NSLog(@"不可达的网络(未连接)");break;case AFNetworkReachabilityStatusReachableViaWWAN:NSLog(@"2G,3G,4G...的网络");break;case AFNetworkReachabilityStatusReachableViaWiFi:NSLog(@"wifi的网络");break;default:break;}}];//开始监听网络状况.
    [_reachabilityManager startMonitoring];return YES;
}-(void)dealloc{//停止监听网络状况.
    [_reachabilityManager stopMonitoring];}

总结:与Reachability相比之下,AFNetworking是不是代码更加的简练呢?AFNetworking其实封装了Reachability,使我们的代码更加的简单易上手.