Can Swift Method Defined on Extensions on Protocols Accessed in Objective-c

Question

Is it possible to call methods defined in a protocol extension in Swift from Objective-C?

For example:

protocol Product {
    var price:Int { get }
          


        

Answer 1

Protocol extension does not work with @objc protocol, however you can extend the class in swift as a workaround.

@objc protocol Product {
   var price: NSNumber? { get }
   var priceString:String { get }
}

...
// IceCream defined in Objective-C that does not extend Product
// but has @property(nonatomic, strong, nullable) (NSNumber*)price
// to make it confirm to Product
...
extension IceCream: Product {
   var priceString:String {
      get {
        return "$\(price ?? "")"
      }
   }
}

This code is not clean at all, but it works.