In Unity, how does Unity magically call all “Interfaces”?

Question

Unity has an "interface":

IPointerDownHandler (doco)

You simply implement OnPointerDown ...

public class Whoa:MonoBehavio         


        

Answer 1

You can use reflection to get all types in an assembly that implements a specific interface and then instantiate those types and call the methods on those instances through the interface.

var types = this.GetType().Assembly.GetTypes()
                                   .Where(t=>t.GetInterfaces().Contains(typeof(IGetNews)));
foreach (var type  in types)
{
    var instance = (IGetNews) Activator.CreateInstance(type);
    instance.SomeNews("news");
}