How do I pass a Swift class to an Objective-C method needing a Class?

Question

I'm looking to use the Objective-C library saxy to parse some XML into objects, however the method signature is:

+ (id)rootXPath:(NSString *)xpath toMany:(Class)toType nsURI:(NSString *)nsURI;

I'm having trouble working out how I'd pass the Class object type as Swift does not seem to work with classes in this way. As a workaround I will probably make the domain model + a wrapper in Objective-C, but would be good to know if there's a way to do it in pure Swift.

I've tried the following, but I get a EXC_BAD_INSTRUCTION:

OXmlElementMapper.rootXPath("/route", toMany: Route.self, nsURI: "")

and this which produces a syntax error:

OXmlElementMapper.rootXPath("/route", toMany: Route.Type, nsURI: "")

did you solved your problem of passing Class to Objective C api from Swift? I am facing the same issue and I tried passing MyClass.self. But this doesn't seems to be working. I am using Xcode 7 Beta 6. — DShah
– DShah, Commented Sep 5, 2015 at 18:05

Jiaaro · Accepted Answer · 2014-06-09 00:37:37Z

5

MyClass.self is the correct way to reference a class, but perhaps you're missing @objc on the class?

See docs regarding interop

answered Jun 9, 2014 at 0:37

Jiaaro

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1 Comment

Mike H Over a year ago

You're quite right - the .self passing wasn't the problem. Looks like there is a bad cast coming out of that method.. thanks for the point in the right direction!

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