How to count Timer on Swift - swift

Question

I'm a newbie in swift and I tried to make a Timer. It should normally count the seconds and print them in the debugger.
I tried this:
var timer = Timer()
#IBAction func killTimer(_ sender: AnyObject) {
timer.invalidate()
}
#objc func processTimer() {
print("This is a second")
}
override func viewDidLoad() {
super.viewDidLoad()
timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(ViewController.processTimer), userInfo: nil, repeats: true)
}
I don't know how the timer count seconds.. With this code i get an fail message:
#objc func processTimer() {
print("This is second \(Timer + 1)")
}
Thanks for your help.
A

Answer 1

You need a counter variable which is incremented every time the timer fires.
Declare the variable Timer as optional to invalidate the timer reliably (only once).
var timer : Timer?
var counter = 0
#IBAction func killTimer(_ sender: AnyObject) {
timer?.invalidate()
timer = nil
}
#objc func prozessTimer() {
counter += 1
print("This is a second ", counter)
}
override func viewDidLoad() {
super.viewDidLoad()
timer = Timer.scheduledTimer(timeInterval:1, target:self, selector:#selector(prozessTimer), userInfo: nil, repeats: true)
}

Answer 2

You need to start your timer, you have only initialised it in your code so in viewDidLoad add
timer.fire()
I am not sure what you want to print but if it is a timestamp then you could do add a property to your class
let formatter = DateFormatter()
and configure it to show time in seconds and milliseconds
formatter.dateFormat = "ss.SSS" //in viewDidLoad
and use it in your print statement
print("This is a second \(formatter.string(from(Date())")

Answer 3

If you want to print the time that passed use this (If that's what you want):
print("time passed: \(Date().timeIntervalSince1970 - timer.fireDate.timeIntervalSince1970)")