Matthaus WoolardOct 2, 2023

Found a fun little bug the other day in MapKit.

If you create a MKLocalPointsOfInterestRequest with a negative radius the constructor returns nil but the swift declaration does not expect an optional response.

Passing this to MKLocalSearch results in a crash.

#iOSDev #SwiftLang

Show threadMarc PalmerOct 2, 2023
@hishnash worst kind of bridging bug! I hate those.
Show threadMatthaus WoolardOct 3, 2023
@marcpalmer yer took me over a day to trace it down (I was not intending to pass negative radius) the worst part is since swift thinks the value is non optional, if let/guard let appear to be optimised away and continue with a nill value. For a while I was chancing down if it was the automatic reference counting going bad due to async and garbage collecting the request to soon or something.
Show threadSaagar Jha
@hishnash @marcpalmer FWIW in cases like these the compiler is not supposed to optimize out immediate casts to optional values (after which you can perform the check as usual)
Oct 3, 2023 at 6:36amWeb