IOS Swift message dispatch with closure

IOS_Swift_Message_Dispatch_with_closure.swift

class DataModel: NSObject {
    var data = 1
    var callback: ((Any?) -> Unmanaged<AnyObject>?)?
}

class CustomClass: NSObject {

    @objc func getValue(_ model: DataModel, completion callback: Any!) {
        print("get Value for CustomClass")
        if let callback = callback as? ((Any?) -> Unmanaged<AnyObject>?) {
            print("closure is not nil")
            _ = callback(model.data)
        }
    }

    @objc func setValue(_ model: DataModel, completion callback: Any!) {
        print("test11 set Value for CustomClass, val is: \(model.data)")
        if let callback = callback as? ((Any?) -> Unmanaged<AnyObject>?) {
            print("test11 closure is not nil")
            _ = callback(model.data)
        }
    }
}

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        let dataModel = DataModel()
        executeAction(className: "TestProject2.CustomClass", methodName: "setValue:completion:", arg: dataModel) { result in
            print("test11 execute setValue callback complete!!, result: \(String(describing: result))")
            return nil
        }
    }

    private func executeAction(className: String, methodName: String, arg: Any?, callback: ((Any?) -> Unmanaged<AnyObject>?)? = nil) {
        let cla: AnyClass? = NSClassFromString(className)
        if let cla = cla as? NSObject.Type {
            let selector: Selector = Selector(methodName)
            let instance = cla.init()
            if (instance.responds(to: selector)) {
                if let arg = arg,
                   let callback = callback {
                    instance.perform(selector, with: arg, with: callback)
                } else if let arg = arg {
                    instance.perform(selector, with: arg)
                } else {
                    instance.perform(selector)
                }
            } else {
                print("method not found")
            }
        } else {
            print("class not found")
        }
    }
}