[SWIFT4] Objective C compatibility

[Sal0g]

Currently the generator (v3.3.3) produces Swift 4.2 code that is not directly useable in Mixed Swift/Objective C projects even though the config files contains:

"objcCompatible":"true",

• Currently the generator produces Struct objects which are not accessible in Objective C. It would instead produces @objc public class CLASSNAME: NSObject, Codable { ... }
• everywhere where public is produced, it would be necessary to have @objc public as in Swift 4, such automatic @objc inference is deprecated and disabled by default

[wing328]

@Sal0g thanks for reporting the issue. May I know if you've time to contribute the fix? We can work with you on the PR.

cc @jgavris (2017/07) @ehyche (2017/08) @Edubits (2017/09) @jaz-ah (2017/09) @d-date (2018/03)

[Sal0g]

I do have a little bit of time that I can offer, but I don't have deep knowledge about the inner workings of the generator. Is it only adapting a few mustaches? If you point me into the right direction I can maybe patch it.

[wing328]

To add @objc in the output when the option objcCompatible is set, you can do the following:

{{#objcCompatible}}@objc {{/objcCompatible}} public

Ref:

openapi-generator/modules/openapi-generator/src/main/resources/swift4/modelObject.mustache

Line 16 in 0eb385c

{{/description}}public var {{name}}: {{{datatype}}}{{#unwrapRequired}}?{{/unwrapRequired}}{{^unwrapRequired}}{{^required}}?{{/required}}{{/unwrapRequired}}{{#defaultValue}} = {{{defaultValue}}}{{/defaultValue}}{{#objcCompatible}}{{#vendorExtensions.x-swift-optional-scalar}}

The templates for Swift 4 can be found in the folder modules/openapi-generator/src/main/resources/swift4/

Let us know if you need further assistance. Thanks for offering help to make the enhancements.

[Sal0g]

@wing328 As this PR is now open for quite some time: Do you still need anything from my side?

The changes are rather trivial, but important for me. So I would love to see them make their way into the project.

[wing328]

Please try the latest swift5 generator and report back if there's still an issue. Thanks.

[Pe-te]

Just fyi: When included as a Pod, subclassing does not work because the classes are public but need to be open.