[swift-evolution] Catching NSException
Evan Maloney
emaloney at gilt.com
Fri Apr 1 14:04:27 CDT 2016
Hi Jon,
I ran into a similar situation and needed a way to not only catch NSExceptions from Swift, but throw them as well. If it would he useful to you, it's part of the open-source CleanroomBridging module, which is intended to ease a few Swift/ObjC interoperability issues. The header file for the exception-related code is here:
https://github.com/emaloney/CleanroomBridging/blob/master/Sources/Exception.h <https://github.com/emaloney/CleanroomBridging/blob/master/Sources/Exception.h>
It is included in the module's bridging header, so you can use it from Swift.
Evan
> On Mar 24, 2016, at 2:06 PM, Jon Brooks via swift-evolution <swift-evolution at swift.org> wrote:
>
> Apologies if this has come up before - I've fallen behind in following this list.
>
> I recently ran into an issue where I needed to be able to catch NSExceptions raised by Objective C API in Swift, and found no good way to do that. Currently the only possible way is to via Objective C code that wraps the call in an Objective C style @try/@catch block. If building a swift framework, this means a separate module, since we can't use bridging headers.
>
> My quick attempt at a workaround can be seen here: https://github.com/jonbrooks/ObjCTryCatch <https://github.com/jonbrooks/ObjCTryCatch> and there are other workarounds out there too. I wondered if there has been any discussion to building something like this into swift directly. I don't really have any good ideas, but maybe something like
>
> do {
> objc_try someObjectiveCInstance.methodThatMightRaiseException()
> } catch {
> //error would be an ErrorType that contains info about the exception raised, or the exception itself?
> }
>
> Any thoughts?
>
>
>
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