Implementing Objective C delegate in Swift - objective-c

Question

I have a Objective C class that has methods that look like this:
#class Client;
#protocol ClientDelegate <NSObject>
#optional
-(void) receivedMessageFromClient : (id) message;
#end
#interface Client : NSObject
+(id) setup;
#property(nonatomic, strong) id <ClientDelegate> clientDelegate;
// more method declarations below
I am implementing the ClientDelegate in my Swift class like this:
class HomeViewController: UIViewController, ClientDelegate {
var client : AnyObject?
var delegate: ClientDelegate?
override func viewDidLoad() {
super.viewDidLoad()
client = Client.setup() as! Client
client.clientDelegate = self
}
func receivedMessageFromClient(message: AnyObject) {
print("Message recieved: \(message)")
}
}
This is giving me a compiling error:
Cannot assign to property: 'self' is immutable
When I remove the lines
client = Client.setup() as! Client
client.clientDelegate = self
the code compiles and calls the method in the Client class that in turns sends a message to receivedMessageFromClient, but the method is not called in HomeViewController. It seems that everything is setup with the exception of assigning self to be the delegate.

Answer 1

Check out my comments on your question but this is a basic example of an Objective-C delegate implemented in Swift:
Objective-C:
#protocol MyDelegate <NSObject>
#optional
- (void)canImplementThis:(int)aVar;
#required
- (BOOL)needToImplementThis;
#end
#interface MyClass : NSObject
#property (nonatomic, weak) id<MyDelegate> delegate;
#end
Swift:
class SwiftClass : UIViewController, MyDelegate {
var myObj : MyClass?
override func viewDidLoad() {
super.viewDidLoad()
myObj = MyClass()
myObj?.delegate = self
}
// MARK: - <MyDelegate>
func canImplementThis(aVar : Int) {
print("Called: \(aVar))
}
func needToImplementThis() -> Bool {
return false
}
}
Forgive any typos I typed this out straight into SO.

Answer 2

Had to change Int to Int32 for some reason so it fix the invalid selector issue, with Int32 on the swift side but then worked