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

If it is ok to remove the priceString from the protocol, and only have it in your extension, you can call the protocol extension by casting IceCream to a Product in a helper extension.

@objc protocol Product {
    var price:Int { get }
}

extension Product {
    var priceString:String {
        return "$\(price)"
    }
}

// This is the trick
// Helper extension to be able to call protocol extension from obj-c
extension IceCream : Product {
    var priceString:String {
        return (self as Product).priceString
    }
}

@objc class IceCream: NSObject {
    var price: Int {
        return 2
    }
}