Open Radar

 
Area:
UIKit

Summary:
In order to provide a smoother user experience, we would like to display our own prompt (suppressing the system "Restore 'Maps'?" prompt when the user has "uninstalled/hidden" Apple Maps in iOS 10 or later, and our app tries to launch Apple Maps.  We have tried calling `UIApplication.shared.canOpenURL("http://maps.apple.com")`, but this always returns `true` regardless of whether the user has Apple Maps installed.

Steps to Reproduce:
1) Uninstall Apple Maps by long pressing "Maps" app on home screen and tapping top left "X" button.
2) Call `UIApplication.shared.canOpenURL("http://maps.apple.com")` from any app.

Expected Results:
I would expect `UIApplication.shared.canOpenURL("http://maps.apple.com")` to return `false` because Apple Maps cannot be launched immediately.

Observed Results:
`UIApplication.shared.canOpenURL("http://maps.apple.com")` returns `true`.  When I subsequently call `UIApplication.shared.open("http://maps.apple.com", options: [:], completionHandler: nil)`, the attached system alert is presented rather than giving the developer a hook to handle the case where Apple Maps is not installed.

Version:
iOS 10 and later.