最近项目中遇到了要判断用户是以哪种上网方式，再做不同的操作，每次主动读取网络状态重复代码太多，因此找到了两种监听网络被动响应的方法。

AFNetworkReachabilityManager

• 添加框架

pod 'AFNetworking', '~> 2.6.3'

• 导入头文件

#import "AFNetworking.h"

• 监听网络

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    [self listenNetWorkingStatus];  //监听网络是否可用
}
-(void)listenNetWorkingStatus{
   //1:创建网络监听者
    AFNetworkReachabilityManager *manager = [AFNetworkReachabilityManager manager];
    //2:获取网络状态
    /*
     AFNetworkReachabilityStatusUnknown          = 未知网络，
     AFNetworkReachabilityStatusNotReachable     = 没有联网
     AFNetworkReachabilityStatusReachableViaWWAN = 蜂窝数据
     AFNetworkReachabilityStatusReachableViaWiFi = 无线网
     */
    [manager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
        switch (status) {
            case AFNetworkReachabilityStatusUnknown:
                NSLog(@"未知网络");
                break;
            case AFNetworkReachabilityStatusNotReachable:
                NSLog(@"没有联网");
                break;
            case AFNetworkReachabilityStatusReachableViaWWAN:
                NSLog(@"蜂窝数据");
                break;
            case AFNetworkReachabilityStatusReachableViaWiFi:
                NSLog(@"无线网");
                break;
            default:
                break;
        }
    }];
    
    //开启网络监听
    [manager startMonitoring];
}

RealReachability

• 添加框架

pod 'RealReachability', '~> 1.1.2'

• 导入头文件

#import "RealReachability.h"

• 监听网络

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
     [self listenNetWorkingStatus]; //监听网络是否可用
}
-(void)listenNetWorkingStatus{
    [GLobalRealReachability startNotifier];
    [[NSNotificationCenter defaultCenter] addObserver:self
                                             selector:@selector(networkChanged:)
                                                 name:kRealReachabilityChangedNotification
                                               object:nil];
    ReachabilityStatus status = [GLobalRealReachability currentReachabilityStatus];
    [self realNetworkingStatus:status];
}

- (void)networkChanged:(NSNotification *)notification
{
    RealReachability *reachability = (RealReachability *)notification.object;
    ReachabilityStatus status = [reachability currentReachabilityStatus];
    [self realNetworkingStatus:status];
}
-(void)realNetworkingStatus:(ReachabilityStatus)status{
    switch (status)
    {
        case RealStatusUnknown:
        {
            NSLog(@"~~~~~~~~~~~~~RealStatusUnknown");
            break;
        }
            
        case RealStatusNotReachable:
        {
            NSLog(@"~~~~~~~~~~~~~RealStatusNotReachable");
            break;
        }
            
        case RealStatusViaWWAN:
        {
            NSLog(@"~~~~~~~~~~~~~RealStatusViaWWAN");
            break;
        }
        case RealStatusViaWiFi:
        {
            NSLog(@"~~~~~~~~~~~~~RealStatusViaWiFi");
            break;
        }
        default:
            break;
    }
}

- (void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}