static let sharedInstance not accessible from Objective-C code

Question

Problem:

The declared static let sharedInstance is not accessible from Objective-C code when building the main app target.

Code:

    @objc public protocol ManagedObjectContextProvider {
          var context: NSManagedObjectContext { get }
    }

@objc public final class ManagedObjectContextProviderImpl: NSObject, ManagedObjectContextProvider {
    public static let sharedInstance: ManagedObjectContextProvider = ManagedObjectContextProviderImpl()
    
    override private init() {}
    
    public var context: NSManagedObjectContext {
        return NSManagedObjectContext.mr_default()
    }
}

Context:

• This file is contained in 2 targets [main iOS App and Share extension]

• In the swift to objc generated header of the main app the interface of the swift class is generated as follows:

    @class NSManagedObjectContext;
  
    SWIFT_PROTOCOL("_TtP4<#MyAppName#>28ManagedObjectContextProvider_")
    @protocol ManagedObjectContextProvider
    @property (nonatomic, readonly, strong) NSManagedObjectContext * _Nonnull context;
    @end
  
  
    SWIFT_CLASS("_TtC4<#MyAppName>32ManagedObjectContextProviderImpl")
    @interface ManagedObjectContextProviderImpl : NSObject <ManagedObjectContextProvider>
    - (nonnull instancetype)init SWIFT_UNAVAILABLE;
    @property (nonatomic, readonly, strong) NSManagedObjectContext * _Nonnull context;
    @end
  

• In the swift to objc generated header of the share extension the interface of the swift class is generated correctly and is:

    @class NSManagedObjectContext;
  
    SWIFT_PROTOCOL("_TtP4<MyAppName>28ManagedObjectContextProvider_")
    @protocol ManagedObjectContextProvider
    @property (nonatomic, readonly, strong) NSManagedObjectContext * _Nonnull context;
    @end
  
  
    SWIFT_CLASS("_TtC4<MyAppName>32ManagedObjectContextProviderImpl")
    @interface ManagedObjectContextProviderImpl : NSObject <ManagedObjectContextProvider>
    SWIFT_CLASS_PROPERTY(@property (nonatomic, class, readonly, strong)       id <ManagedObjectContextProvider> _Nonnull sharedInstance;)
    + (id <ManagedObjectContextProvider> _Nonnull)sharedInstance SWIFT_WARN_UNUSED_RESULT;
    - (nonnull instancetype)init SWIFT_UNAVAILABLE;
    @property (nonatomic, readonly, strong) NSManagedObjectContext * _Nonnull context;
     @end
  

• MyAppName specified above is the module name used when generating the Swift to Obj-C header and is the same for both main target and share extension

What I've tried:

1. Copy the same class declaration in both headers [tricks the compiler but fails at runtime with "unrecognized selector"]
2. Modify the module name of the extension so that it would have a diff module name than the target

What not to propose as a solution:

1. To use a different module instead of files belonging to 2 targets

Answer 1

To make members (also static) accessible to ObjC code, you need to add @objc modifier to them, or @objcMembers modifier to class (which is a syntactic sugar to marking all the members with @objc). Read more in documentation.