NSTimer call function from superclass - ios

Question

Let's say I have a class Timer that works as a timer.
I want every other class that can act like a timer to have an attribute of type Timer.
The problem is: the Timer class uses a NSTimer attribute and I don't know how to associate functions from outside Timer in it.
For example: Class A has attribute B, which is Timer. How can scheduledTimerWithTimerInterval call some function of A?
Here is timer:
import UIKit
class Timer{
var interval: NSTimeInterval!
var counting: Bool = false
var numberOfTouches: Int = 0
private var timer: NSTimer = NSTimer()
init(interval: CGFloat){
self.interval = NSTimeInterval(interval)
self.counting = false
}
func Start(function: String) {
if(self.counting){
self.numberOfTouches += 1
self.timer.invalidate()
self.timer = NSTimer.scheduledTimerWithTimeInterval(self.interval, target: self, selector: Selector(function), userInfo: nil, repeats: false)
}
else{
self.counting = true
self.numberOfTouches = 1
}
}
func Stop(){
if(!self.counting){
self.counting = false
}
}
}
here is the ViewController:
import UIKit
class ViewController: UIViewController {
var timer: Timer = Timer(interval: 1.0)
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func Trigger(sender: AnyObject) {
//yes, this doesn't call t() from the ViewController
timer.Start("self.t")
}
func t(){
label.text = String(timer.numberOfTouches)
}
#IBOutlet weak var label: UILabel!
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
Finally, what this timer tries to do is:
when I press the button, it starts counting and set the number of touches to 1;
if I press it again, less than 1 second after the touch before, it restart the 1 second timer and increases the touch by 1;
after 1 second without any touch, it should call t() from the ViewController to set the label to the last number of touches.
What approach should I use to fix this?
Thank you!
PS: in the beginning, it was Selector("Stop")

Answer 1

It's not "self.t", you supply the object as the target. The selector is something like "ViewController.t" or "t". You need to change Start to take a target object as well.
Move to Xcode 7.3.1 and use the new selector syntax if you can -- it will be type-checked.