如果用系統(tǒng)的方法需要導入 Reachability.h Reachability.m

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

@end

@implementation ViewController

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

// nullable : 代表可以為nil
// __nonnull : 代表不能為nil
[manager GET:@"www.520it.com" parameters:nil success:^ void(NSURLSessionDataTask * task, id responseObjc) {
NSLog(@"成功的回調(diào)");
} failure:^ void(NSURLSessionDataTask * task, NSError * error) {
NSLog(@"失敗的回調(diào)");
}];
*/

// 1.創(chuàng)建Reachability對象
self.r1 = [Reachability reachabilityForLocalWiFi];
// 2.給Reachability對象注冊通知
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(getNetworkStatus) name:kReachabilityChangedNotification object:nil];
// 3.讓Reachability對象發(fā)送網(wǎng)絡改變的通知
[self.r1 startNotifier];

}

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

• (void)getNetworkStatus
  {
  if ([Reachability reachabilityForLocalWiFi].currentReachabilityStatus != NotReachable) {
  NSLog(@"當前是蜂窩網(wǎng)");
  }else if ([Reachability reachabilityForInternetConnection].currentReachabilityStatus != NotReachable)
  {
  NSLog(@"當前是蜂窩網(wǎng)");
  }else
  {
  NSLog(@"沒有網(wǎng)絡");
  }
  }

• (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent )event
  {
  /
  // 1.創(chuàng)建Reachability對象
  // 創(chuàng)建一個蜂窩網(wǎng)的Reachability對象
  Reachability *r1 = [Reachability reachabilityForInternetConnection];
  // 2.獲取當前對象的網(wǎng)絡狀態(tài), 如果不是NotReachable值, 那么就代表當前的網(wǎng)絡狀態(tài)是我們創(chuàng)建的類型
  if(r1.currentReachabilityStatus != NotReachable)
  {
  NSLog(@"當前是蜂窩網(wǎng)");
  }
  // 創(chuàng)建一個局域網(wǎng)的Reachability對象
  Reachability *r2 = [Reachability reachabilityForLocalWiFi];
  if(r2.currentReachabilityStatus != NotReachable)
  {
  NSLog(@"當前是蜂窩網(wǎng)");
  }
  */

}

• (void)afnReachability
  {
  // 1.創(chuàng)建網(wǎng)絡監(jiān)聽管理者
  AFNetworkReachabilityManager *manager = [AFNetworkReachabilityManager sharedManager];

  // 2.設置網(wǎng)絡變化的回調(diào)
  [manager setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status) {
  // 只要用戶的網(wǎng)絡發(fā)生改變, 就會調(diào)用這個block
  /*
  AFNetworkReachabilityStatusUnknown = 不能識別,
  AFNetworkReachabilityStatusNotReachable = 沒有網(wǎng)絡,
  AFNetworkReachabilityStatusReachableViaWWAN = 蜂窩網(wǎng),
  AFNetworkReachabilityStatusReachableViaWiFi = 局域網(wǎng),
  */
  switch (status) {
  case AFNetworkReachabilityStatusReachableViaWWAN:
  NSLog(@"蜂窩網(wǎng)");
  break;
  case AFNetworkReachabilityStatusReachableViaWiFi:
  NSLog(@"局域網(wǎng)");
  break;
  case AFNetworkReachabilityStatusNotReachable:
  NSLog(@"沒有網(wǎng)絡");
  break;
  default:
  NSLog(@"不能識別");
  break;
  }
  }];

  // 3.開始監(jiān)聽
  [manager startMonitoring];
  }

@end