Reachability类检测网络状态

最新推荐文章于 2018-08-15 15:42:37 发布

转载最新推荐文章于 2018-08-15 15:42:37 发布 · 661 阅读

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#iOS #Reachability类检测网络状态

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本文介绍了一种在iOS应用中监测网络状态变化的方法，包括注册通知、创建Reachability实例、处理网络状态改变及关闭通知等步骤，并提供了两种实现方式：基于NSNotification的通知方式和Block方式。

转载自：http://blog.youkuaiyun.com/lansekj/article/details/7835857

1、注册通知

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(reachabilityIsChanged:) name:kReachabilityChangedNotification object:nil];

2、创建Reachability实例对象并开启通知

struct sockaddr_in address;

memset(&address, 0, sizeof(address));

address.sin_len = sizeof(address);

address.sin_family = AF_INET;

address.sin_port = htonl(IP_PORT);

address.sin_addr.s_addr = htons(inet_addr(IP_Address));

reachability = [[Reachability reachabilityWithAddress:&address] retain];

[reachability startNotifier];//开启网络检测

3、网络状态改变接受通知处理

-(void)reachabilityIsChanged:(NSNotification *)notify {

Reachability *curReach = [notify object];

NetworkStatus networkStatus = [curReach currentReachabilityStatus];

if (networkStatus == NotReachable) { //无网络状态

//TODO

} else { //有网络状态，3G或wifi

//TODO

}

4、关闭通知并释放对象

[[NSNotificationCenter defaultCenter] removeObserver:self name:kReachabilityChangedNotification object:nil];

if (reachability) {

[reachability stopNotifier]; //关闭网络检测

[reachability release];

}

Block方式

- (void)viewDidLoad  
{  
    [super viewDidLoad];  
     DLog(@"开启 www.apple.com 的网络检测");  
     Reachability* reach = [Reachability reachabilityWithHostname:@"www.apple.com"];  
     DLog(@"-- current status: %@", reach.currentReachabilityString);  
      
     // start the notifier which will cause the reachability object to retain itself!  
      
     [[NSNotificationCenter defaultCenter] addObserver:self  
                                                        selector:@selector(reachabilityChanged:)  
                                                             name:kReachabilityChangedNotification  
                                                          object:nil];  
      
     reach.reachableBlock = ^(Reachability * reachability)  
    {  
        dispatch_async(dispatch_get_main_queue(), ^{  
            self.blockLabel.text = @"网络可用";  
               self.blockLabel.backgroundColor = [UIColor greenColor];  
        });  
    };  
     
    reach.unreachableBlock = ^(Reachability * reachability)  
    {  
        dispatch_async(dispatch_get_main_queue(), ^{  
            self.blockLabel.text = @"网络不可用";  
               self.blockLabel.backgroundColor = [UIColor redColor];  
        });  
    };  
      
     [reach startNotifier];  
}

notification方式

- (void)viewDidLoad  
{  
    [super viewDidLoad];  
     DLog(@"开启 www.apple.com 的网络检测");  
     Reachability* reach = [Reachability reachabilityWithHostname:@"www.apple.com"];  
     DLog(@"-- current status: %@", reach.currentReachabilityString);  
      
     // start the notifier which will cause the reachability object to retain itself!  
      
     [[NSNotificationCenter defaultCenter] addObserver:self  
                                                        selector:@selector(reachabilityChanged:)  
                                                             name:kReachabilityChangedNotification  
                                                          object:nil];  
     [reach startNotifier];  
}  
  
- (void) reachabilityChanged: (NSNotification*)note {  
     Reachability * reach = [note object];  
     
    if(![reach isReachable])  
    {  
        self.notificationLabel.text = @"网络不可用";  
          self.notificationLabel.backgroundColor = [UIColor redColor];  
          self.wifiOnlyLabel.backgroundColor = [UIColor redColor];  
          self.wwanOnlyLabel.backgroundColor = [UIColor redColor];  
          return;  
    }  
         
     self.notificationLabel.text = @"网络可用";  
     self.notificationLabel.backgroundColor = [UIColor greenColor];  
      
     if (reach.isReachableViaWiFi) {  
          self.wifiOnlyLabel.backgroundColor = [UIColor greenColor];  
          self.wifiOnlyLabel.text = @"当前通过wifi连接";  
     } else {  
          self.wifiOnlyLabel.backgroundColor = [UIColor redColor];  
          self.wifiOnlyLabel.text = @"wifi未开启，不能用";  
     }  
      
     if (reach.isReachableViaWWAN) {  
          self.wwanOnlyLabel.backgroundColor = [UIColor greenColor];  
          self.wwanOnlyLabel.text = @"当前通过2g or 3g连接";  
     } else {  
          self.wwanOnlyLabel.backgroundColor = [UIColor redColor];  
          self.wwanOnlyLabel.text = @"2g or 3g网络未使用";  
     }  
}