[aerogear-dev] Swift to Objective-C interop: one aspect of iOS7 Swift support

[Matthias Wessendorf]

On Fri, Jan 23, 2015 at 9:30 AM, Corinne Krych <corinnekrych at gmail.com>
wrote:

> Hello all,
>
> Yesterday I was discussing with Sebi about @objc and how you make a Swift
> class available in Objective-C
>
> Sebi has one issue, in its Swift protocol he wants to declare
> longitude/latitude Double and make them optional [1]. Because his protocol
> is swift only (not inheriting a Obj-c one) he uses @objc and this is when,
> compiler complains with “Property cannot be marked @objc because its type
> cannot be represented in Objective-C”.
>
> This issue is well-explain in this stack overflow thread [2]
> One work-around (the one used by Sebi) is to use NSNumber and make then
> optional.
>
> To echo that issue, yesterday Christos on this thread [3] gave the example
> of QueryKit which uses pod subspec coupled with some Objective-C re-write
> classes (seen as temporary) to bridge the gap Swift to Objective-C fro a
> Swift first library.
>
> As we’re talking about iOS7 support for our Swift libs there are 2 aspect
> of it:
> - support from obj-c code is one aspect
> - dynamic fwk support as expained in this thread [4] is another one…
>
> All in one, it makes me wonder if it’s worth it… all those hacks in Swift
> code.


+1


> Maybe the option we used for ios-push lib i.e.: having obj-c and swift
> version of the lib would be a better approach.
>

that means we need to code the missing parts on our other libs, like http
or oauth, right ?



>
> ++
> Corinne
> [1]
> https://github.com/sebastienblanc/helloworld-geo-ios/blob/master/UnifiedGeo%2FUnifiedGeo%2FAGClientDeviceInformation.swift#L46
> [2]
> http://stackoverflow.com/questions/26366082/cannot-access-property-of-swift-type-from-objective-c
> [3]
> http://aerogear-dev.1069024.n5.nabble.com/aerogear-dev-Parallel-support-for-a-Cocoapods-Swift-Obj-c-library-td10632.html
> [4]
> http://aerogear-dev.1069024.n5.nabble.com/aerogear-dev-Swift-Frameworks-Static-libs-and-Cocoapods-tc8456.html
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Matthias Wessendorf

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