Difference between @objc before class and @objc(class_name) above class in swift?

Question

What's the difference between :

@objc class MyClass: NSObject{}

and

@objc(MyClass)
class MyClass: NSObject{}

Answer 1

The @objc modifier is being deprecated in Swift 2. All classes that were marked as @objc have to be a subclass of NSObject, thus making the modifier @objc redundant.

@objc(xxx), however, is used to define an alternative name for the class (to be used by the runtime and from Objective-C code).

This modifier is only useful if you want a different name to use in your runtime / Objective C code.

By default the runtime name is same as the declared name, prefixed by the module name and a dot. For example, class X: NSObject {} would be @objc(MyModule.X) at runtime.