问题
Any ways to detect the new Reachability gesture of iOS8 in Objective-C?
The gesture is activated double tapping the TouchID button on the iPhone6 and iPhone6Plus.
回答1:
There are no public APIs for it.
There are two related private API methods on UIApplication I can find (using either of these should get your app rejected from the App Store):
_setReachabilitySupported:, which presumably would en/disable reachability (like Spotlight)_deactivateReachability, which would return the view to the normal place on the screen
I don't see anything that informs your application that the user has performed the gesture, however.
You could also experiment with subclassing UIWindow and overriding setFrame:. Set a breakpoint in this method, and if it fires when you enable Reachability, you can look at the stack trace for more information.
来源：https://stackoverflow.com/questions/26371061/detect-ios8-reachability-gesture