Unrecognized selector sent to instance NSTimer Swift

Question

I\'m trying to developing an app that includes a simple Stopwatch feature. I\'m using Xcode 6 and the Swift language. Here is the code in FirstViewController

Answer 1

let updateTime be a class method .
And if it's in a pure Swift class you'll need to preface that method's declaration with @objc like:

class A {
     @objc func updateTime(timer:NSTimer) {

     }
}