iOS 判斷網絡請求

+ (BOOL)isConnectionAvailable{

    BOOL isExistenceNetwork = YES;

    Reachability *reach = [Reachability reachabilityWithHostName:@"www.apple.com"];

    switch ([reach currentReachabilityStatus]) {

        case NotReachable:

            isExistenceNetwork = NO;

            //NSLog(@"notReachable");

            break;

        case ReachableViaWiFi:

            isExistenceNetwork = YES;

            //NSLog(@"WIFI");

            break;

        case ReachableViaWWAN:

            isExistenceNetwork = YES;

            //NSLog(@"3G");

            break;

    }

    return isExistenceNetwork;

}