In my code, I'm referring a protocol written in Objective-C in another protocol written in Swift like this:
// Objective-C
@protocol C
- (void)c;
@end
//Swift
protocol A {
var a : UIView { get }
}
extension A where Self: C {
var a : UIView {
return UIView()
}
func c() {
// default implementation of c
// self.a bla bla bla
}
}
// Compiler will complain ViewController does not conform to C
class ViewController: UIViewController, A, C {
//...
}
The problem is even though I provided default implementation of C in the protocol A, the ViewController seems unable to get it and the code won't compile due to the ViewController does not conform to C error. It would be fine if the protocol C is written in Swift.
In my actual project, the protocol C is from third party (GIDSignInDelegate) which I cannot simply rewrite them. It's a common usage if you want to build some abstraction upon other abstractions written in Objective-C.
I created a sample project here: https://github.com/linktoming/Protocol-Demo
