Custom Classes

[sammysmallman]

Thanks for the example. Its really nice to see XPC Service in action. I have been attempting to send a custom class across an XPC connection but will little success. I wondered if you have had any success?

[aronskaya]

@sammysmallman, I am glad it is useful for you. I didn't want to overcomplicate the sample, but you are right, it is worth adding. For now I can just refer to documentation, see 'Working with Custom Classes' https://developer.apple.com/library/archive/documentation/MacOSX/Conceptual/BPSystemStartup/Chapters/CreatingXPCServices.html#//apple_ref/doc/uid/10000172i-SW6-SW7

[sammysmallman]

Hey @aronskaya,

So i worked it out. The key points are that the class needs to conform to NSSecureCoding and also that you need to have a CodingKeys enum even if your property names are exactly the same.

@objc public class User: NSObject, Codable, NSSecureCoding {  

    public enum CodingKeys: String, CodingKey {
        case name, email
    }

    public static var supportsSecureCoding: Bool = true
    
    public func encode(with coder: NSCoder) {
        coder.encode(name, forKey: "name")
        coder.encode(email, forKey: "email")
    }
    
    public required init?(coder: NSCoder) {
        guard let name = coder.decodeObject(of: NSString.self, forKey: "name") as String?,
                   let email = coder.decodeObject(of: NSString.self, forKey: "email") as String?
        else {
            return nil
        }

        self.name = name
        self.email = email
    }
    
    public let name: String
    public let email: String
    
    public override var description: String { return "name:\(name), email: \(email)"}
    
}

which can be used in the Service Protocol like so:
func login(name: String, email: String, completionHandler: @escaping (User) -> Void)