How do I declare a class level function in Swift?

Question

I can't seem to find it in the docs, and I'm wondering if it exists in native Swift. For example, I can call a class level function on an NSTimer like so:

NSTimer.scheduledTimerWithTimeInterval(0.2, target: self, selector: "someSelector:", userInfo: "someData", repeats: true) 

But I can't seem to find a way to do it with my custom objects so that I could call it like:

MyCustomObject.someClassLevelFunction("someArg") 

Now, I know we can mix Objective-C w/ Swift and it's possible that the NSTimer class method is a remnant from that interoperability.

Question

1. Do class level functions exist in Swift?

2. If yes, how do I define a class level function in Swift?

Answer 1

Yes, you can create class functions like this:

class func someTypeMethod() {     //body } 

Although in Swift, they are called Type methods.

Answer 2

You can define Type methods inside your class with:

class Foo {     class func Bar() -> String {         return "Bar"     } } 

Then access them from the class Name, i.e:

Foo.Bar() 

In Swift 2.0 you can use the static keyword which will prevent subclasses from overriding the method. class will allow subclasses to override.