SCNetworkReachability is returning weirdly wrong results in an iOS app I’m
debugging. I’m running the app in the iOS Simulator (Xcode 6.3.1, iOS 8.3) and
simulating offline mode by turning off WiFi on my Mac*. But the reachability
values I’m getting don’t make any sense.
The code is adapted from code I’ve been using for years, so I pretty much trust
it. It creates the ref with SCNetworkReachabilityCreateWithName (using a FQDN),
then schedules it on a dispatch queue.
First I turn off WiFi and launch the app. My SCNetworkReachabilityCallBack
function is called and logs:
Reachability change: (target=0x7ff53a093a30, info=0x7ff53a0939b0,
flags=0007)
The flags indicate Transient connection + Reachable + Connection required.
That's wrong — it implies something like PPP or a VPN is available that would
make the host reachable.
Then when I turn WiFi back on, the callback logs:
Reachability change: (target=0x7ff53a093a30, info=0x7ff53a0939b0,
flags=0000)
That of course means Unreachable, which is completely wrong.
I haven’t yet had a chance to try this with a real device.
—Jens
PS: Re. earlier discussions, I’m not using Reachability to determine whether or
not to connect. It’s being used after there’s an error connecting to the host,
with the intent of cutting short the retry interval and immediately retrying
the connection when the host becomes reachable. But it’s not even working for
that :(
* If the Simulator has menu items to do things like trigger iCloud sync and
change the fake geo location, why doesn’t it have menu commands to simulate
losing the network? There isn’t even an Airplane Mode toggle in the simulator’s
Settings app. I’ll file a Radar.
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