Can't invalidate timer swift - ios

Question

In my app I should use multiple timers but I don't want to add separate timers for every function, how can I create one function that simplifies creating multiple timers, I tried this code below, it works but I can't invalidate timers.
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var first: UILabel!
#IBOutlet weak var second: UILabel!
var count = 0
var count2 = 0
var timer = Timer()
var timer2 = Timer()
override func viewDidLoad() {
super.viewDidLoad()
timerWithDifferentIntervals(myTimer: timer, interval: 1, target: self, selector: #selector(handle1), userInfo: nil, repeats: true)
timerWithDifferentIntervals(myTimer: timer2, interval: 1/6, target: self, selector: #selector(handle2), userInfo: nil, repeats: true)
}
func handle1() {
count += 1
first.text = "\(count)"
}
func handle2() {
count2 += 1
second.text = "\(count2)"
}
func timerWithDifferentIntervals(myTimer: Timer, interval: TimeInterval, target: Any, selector: Selector, userInfo: Any?, repeats: Bool) {
var timers = myTimer
timers = Timer.scheduledTimer(timeInterval: interval, target: target, selector: selector, userInfo: userInfo, repeats: repeats)
}
#IBAction func stop(_ sender: UIButton) {
timer.invalidate()
timer2.invalidate()
}
}

Answer 1

You never actually assign a new value to your variables. The timers you create are not saved anywhere, therefore you cannot invalidate them.
I would recommend the following changes:
var timer: Timer? {
didSet {
oldValue?.invalidate()
}
}
var timer2: Timer? {
didSet {
oldValue?.invalidate()
}
}
This will make sure the previous timer is always invalidated when assigning a new one. You can then invalidate using timer = nil or timer2 = nil.
Also, you should return the timer from your method:
func timerWithDifferentIntervals(interval: TimeInterval, target: Any, selector: Selector, userInfo: Any?, repeats: Bool) -> Timer {
return Timer.scheduledTimer(timeInterval: interval, target: target, selector: selector, userInfo: userInfo, repeats: repeats)
}
and use it in following way:
timer = timerWithDifferentIntervals(interval: 1, target: self, selector: #selector(handle1), userInfo: nil, repeats: true)
Although the method does basically nothing now, so there is no need for it

Answer 2

Add NStimers in an array, and each timer have a tag of its own.
Then whenever you want to invalidate a timer, reach it via the array and invalidate it.
Hope this helps!

Answer 3

I'm thinking you should use below code for timer create and invalidate
var timer : NSTimer?
func startTimer(_ timeInterval: Int, _ isRepeat: Bool)
{
if timer == nil {
timer = NSTimer.scheduledTimerWithTimeInterval(timeInterval, target: self, selector: "timerFired", userInfo: nil, repeats: isRepeat)
}
}
func stopTimer()
{
if timer != nil {
timer!.invalidate()
timer = nil
}
}