在iOS中使用AFNetworking 2检查连接的最佳方法？

Question

我想在向服务器发出请求之前检查用户设备是否已连接到互联网。为此我在AppDelegate类

中执行此操作

- (void)applicationDidBecomeActive:(UIApplication *)application {
    // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
    [self connectivity];
}
    -(void)connectivity
    {
        [[AFNetworkReachabilityManager sharedManager] setReachabilityStatusChangeBlock:^(AFNetworkReachabilityStatus status){

        }];

        // Set the reachabilityManager to actively wait for these events
        [[AFNetworkReachabilityManager sharedManager] startMonitoring];
    }

当我提出任何要求时

AFNetworkReachabilityStatus status = [AFNetworkReachabilityManager sharedManager].networkReachabilityStatus;
BOOL con = (status == AFNetworkReachabilityStatusReachableViaWiFi || status == AFNetworkReachabilityStatusReachableViaWWAN);
//BOOL con =[AFNetworkReachabilityManager sharedManager].reachable;//give same result as networkReachabilityStatus

但是，当我第一次发出请求时，它会给我NO并在一段时间后给出正确的值。请建议监控连接的最佳方法。

Answer 1

您可以查看属性 networkReachabilityStatus ：

AFNetworkReachabilityStatus status = [AFNetworkReachabilityManager sharedManager].networkReachabilityStatus;
BOOL rechable = (status == AFNetworkReachabilityStatusReachableViaWiFi || status == AFNetworkReachabilityStatusReachableViaWWAN);

如果您想在状态 AFNetworkReachabilityStatusUnknown 时尝试执行smth，您可以使用：

BOOL rechable = (status == AFNetworkReachabilityStatusReachableViaWiFi || status == AFNetworkReachabilityStatusReachableViaWWAN || status == AFNetworkReachabilityStatusUnknown);

P.S。

检查可达性是异步操作，请参阅SCNetworkReachabilityRef，因此您无法在 applicationDidFinishLaunching 方法中获取networkReachabilityStatus。