[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.


> 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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