I'm trying to convert code from Objective-C to Swift. It won't be possible to convert all of it, since the project uses C++ and thus also Objective-C++ but at least the used protocols should be written in Swift.
So while trying to convert one with a block as a property I've stumbled over problems.
My Objective-C protocol:
@protocol ObjcProtocol<NSObject>
@property (nullable, nonatomic, copy, readwrite) dispatch_block_t callback;
@end
My Swift protocol:
@objc public protocol SwiftProtocol: NSObjectProtocol {
var callback: ()->() { get set }
}
Trying to set this property in Objective-C I get this error:
"Property 'callback' not found on object of type 'NSObject *'"
The created Swift header file contains this:
@property (nonatomic, copy) void (^ _Nonnull callback)(void);
I've also stumbled upon @convention(block). Declaring it directly in the var doesn't work, as I get an error claiming it can only be used as a function type. So I've tried using a typealias:
public typealias callBackType = (@convention(block) () -> ())
which once again results in the property not being found.
Something else I've tried but had no success, was explicitly annotating the property with @objc.
Setting the callback function type to optional also didn't change anything.
Furthermore I've tried creating an Objective-C protocol containing the callback and make the SwiftProtocol depend on the newly created protocol. Same result...
What am I missing?
