iOS 真·实时监听网络变化

项目中常常需要监听程序的网络变化，判断用户是以哪种上网方式，在网上搜索了一番，找到了两个常用的监听网络的方法，第一种是使用AFNetworking中的AFNetworkReachabilityManager，第二种是使用苹果推荐的Reachability，如果你以为我这里在写下它俩的用法，那你就错了（好吧，是我错了，还是要写下这两个的用法）。请看标题，为什么叫真·实时监听网络变化，这两种方法确实能监听到网络的状态，但是有一种情况，就是链接上了WiFi，但是这个WiFi是没有网的，此时用那两种方法只能判断当前设备链接的WiFi，无法判断能不能连接到互联网。努力上午搜寻了一下，发现一个开源的三方挺好用，这里分享下（先贴下AFNetworkReachabilityManager和Reachability，有些情况下还是需要它俩的，做个记录）。

以下都是在AppDelegate文件中编写的，有添加通知的是实时监听网络，未添加通知的地方如需要实时监听请自行添加，添加完别忘移除通知(有点啰嗦，谁让我记性差)。

AFNetworkReachabilityManager

-下载AFNetworking

• 包含头文件#import "AFNetworking.h"

- (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];
}

Reachability

• 下载Reachability，把Reachability.h Reachability.m文件导入工程
• 包含头文件#import "Reachability.h"
• 生成两个全局对象

@property (nonatomic) Reachability *hostReachability;
@property (nonatomic) Reachability *internetReachability;     

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
     [self listenNetWorkingStatus]; //监听网络是否可用
}
-(void)listenNetWorkingStatus{
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityChanged:) name:kReachabilityChangedNotification object:nil];
     // 设置网络检测的站点
     NSString *remoteHostName = @"www.apple.com";
 
     self.hostReachability = [Reachability reachabilityWithHostName:remoteHostName];
     [self.hostReachability startNotifier];
     [self updateInterfaceWithReachability:self.hostReachability];
 
     self.internetReachability = [Reachability reachabilityForInternetConnection];
     [self.internetReachability startNotifier];
     [self updateInterfaceWithReachability:self.internetReachability];
}

- (void) reachabilityChanged:(NSNotification *)note
 {
     Reachability* curReach = [note object];
     [self updateInterfaceWithReachability:curReach];
 }
 
 - (void)updateInterfaceWithReachability:(Reachability *)reachability
 {
 
     NetworkStatus netStatus = [reachability currentReachabilityStatus];
     switch (netStatus) {
       case 0:
         NSLog(@"NotReachable----无网络");
         break;
 
       case 1:
         NSLog(@"ReachableViaWiFi----WIFI");
         break;
 
       case 2:
         NSLog(@"ReachableViaWWAN----蜂窝网络");
         break;
 
       default:
         break;
 }
 
 }
 - (void)dealloc
 {
     [[NSNotificationCenter defaultCenter] removeObserver:self name:kReachabilityChangedNotification object:nil];
 }

真·实时监听网络变化 RealReachability

• 点上面的名称下载
• 把RealReachability文件夹拷贝到项目中
• 包含头文件#import "RealReachability.h"

- (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");
            [self showNetworkStatusAlert:@"当前网络不可用"];
            break;
        }
            
        case RealStatusNotReachable:
        {
            NSLog(@"~~~~~~~~~~~~~RealStatusNotReachable");
            [self showNetworkStatusAlert:@"无网络,请检查网络链接"];
            break;
        }
            
        case RealStatusViaWWAN:
        {
            NSLog(@"~~~~~~~~~~~~~RealStatusViaWWAN");
            [self showNetworkStatusAlert:@"流量上网"];
            break;
        }
        case RealStatusViaWiFi:
        {
            NSLog(@"~~~~~~~~~~~~~RealStatusViaWiFi");
//            [self showNetworkStatusAlert:@"WIFI上网,尽情挥霍吧小宝贝~"];
            break;
        }
        default:
            break;
    }
}

-(void)showNetworkStatusAlert:(NSString *)str{
    //我这里是网络变化弹出一个警报框，由于不知道怎么让widow加载UIAlertController，所以这里用UIAlertView替代了
    UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"提示" message:str delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
    [alert show];
}
- (void)dealloc
{
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

帮助到你的话请点喜欢并来波关注，点关注，不迷路（个人原创）