ios - 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我都会这样做

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

但是当我第一次提出请求时，它给了我NO，一段时间后它给出了正确的值。请建议监控连接的最佳方法。

Answer 1

您可以检查属性networkReachabilityStatus:

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

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

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

附言

可达性检查是异步操作，参见SCNetworkReachabilityRef ，因此您无法在 applicationDidFinishLaunching 方法中获取 networkReachabilityStatus。