监听网络状态

如果用系统的方法需要导入 Reachability.h Reachability.m

@interface ViewController ()
@property (nonatomic, strong) Reachability r1; /*< <#属性名#> */

@end

@implementation ViewController

• (void)viewDidLoad {
  [super viewDidLoad];
  /*
  AFHTTPSessionManager *manager = [AFHTTPSessionManager manager];

// nullable : 代表可以为nil
// __nonnull : 代表不能为nil
[manager GET:@"www.520it.com" parameters:nil success:^ void(NSURLSessionDataTask * task, id responseObjc) {
NSLog(@"成功的回调");
} failure:^ void(NSURLSessionDataTask * task, NSError * error) {
NSLog(@"失败的回调");
}];
*/

// 1.创建Reachability对象
self.r1 = [Reachability reachabilityForLocalWiFi];
// 2.给Reachability对象注册通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(getNetworkStatus) name:kReachabilityChangedNotification object:nil];
// 3.让Reachability对象发送网络改变的通知
[self.r1 startNotifier];

}

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

• (void)getNetworkStatus
  {
  if ([Reachability reachabilityForLocalWiFi].currentReachabilityStatus != NotReachable) {
  NSLog(@"当前是蜂窝网");
  }else if ([Reachability reachabilityForInternetConnection].currentReachabilityStatus != NotReachable)
  {
  NSLog(@"当前是蜂窝网");
  }else
  {
  NSLog(@"没有网络");
  }
  }

• (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent )event
  {
  /
  // 1.创建Reachability对象
  // 创建一个蜂窝网的Reachability对象
  Reachability *r1 = [Reachability reachabilityForInternetConnection];
  // 2.获取当前对象的网络状态, 如果不是NotReachable值, 那么就代表当前的网络状态是我们创建的类型
  if(r1.currentReachabilityStatus != NotReachable)
  {
  NSLog(@"当前是蜂窝网");
  }
  // 创建一个局域网的Reachability对象
  Reachability *r2 = [Reachability reachabilityForLocalWiFi];
  if(r2.currentReachabilityStatus != NotReachable)
  {
  NSLog(@"当前是蜂窝网");
  }
  */

}

• (void)afnReachability
  {
  // 1.创建网络监听管理者
  AFNetworkReachabilityManager *manager = [AFNetworkReachabilityManager sharedManager];

  // 2.设置网络变化的回调
  [manager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
  // 只要用户的网络发生改变, 就会调用这个block
  /*
  AFNetworkReachabilityStatusUnknown = 不能识别,
  AFNetworkReachabilityStatusNotReachable = 没有网络,
  AFNetworkReachabilityStatusReachableViaWWAN = 蜂窝网,
  AFNetworkReachabilityStatusReachableViaWiFi = 局域网,
  */
  switch (status) {
  case AFNetworkReachabilityStatusReachableViaWWAN:
  NSLog(@"蜂窝网");
  break;
  case AFNetworkReachabilityStatusReachableViaWiFi:
  NSLog(@"局域网");
  break;
  case AFNetworkReachabilityStatusNotReachable:
  NSLog(@"没有网络");
  break;
  default:
  NSLog(@"不能识别");
  break;
  }
  }];

  // 3.开始监听
  [manager startMonitoring];
  }

@end