Having trouble with NSTimer (Swift)

Question

--EDITED WITH UPDATED INFORMATION--

What I wish to do is call a function named timerFunc once every five seconds using a NSTimer.scheduledTimerWithTimeInterval method, the issue seems is that during runtime, I get the error

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-      
[Animation.ViewController timerFunc:]: unrecognized selector sent to instance 0x7fe548d66040'

In the output log. I've been looking up other people's NSTimers to no avail, I see quite a few have the selector as selector: Selector("timerFunc:") instead of selector: Selector("timerFunc") both ways, however, give the error. Another thing is that both the timerFunc function and the NSTimer are inside of viewDidLoad, are there any issues with that? Any insight on the problem is greatly appreciated, thanks for reading.

timerFunc below

func timerFunc(){

    println("Timer")
}

NSTimer below

NSTimer.scheduledTimerWithTimeInterval(
        5.0,
        target: self,
        selector: Selector("timerFunc"),
        userInfo: nil,
        repeats: true)

Answer 1

Another thing is that both the timerFunc function and the NSTimer are inside of viewDidLoad, are there any issues with that?

Yes. That is your problem. The timerFunc can't be nested inside of viewDidLoad, it must be a top level function at the same level as viewDidLoad.

class ViewController: UIViewController {

    override func viewDidLoad() {
        ....
        NSTimer.scheduledTimerWithTimeInterval(5.0, target: self, selector: "timerFunc", userInfo: nil, repeats: true)
    }

    func timerFunc() {
        println("Timer")
    }

}

When the timer fires, it will call the function specified by the selector on the the object designated by target. That is, it will call self.timerFunc(). When your timerFunc() is nested inside of ViewDidLoad, it can't find it.