Error - 'ViewController' does not have a member named 'seconds' - ios

Question

I am making an app where a textfield input is shown on a label for the amount of time (in seconds) indicated on an other textfield. My app only runs when var seconds is set to an integer and not to the textfield input. When I set var seconds to the textfield input, I get the following error on the indicated lines of code: 'ViewController' does not have a member named 'seconds' Can anyone help? Thanks.
Here is all of my code, the lines of code with the error have //Error beside them:
class ViewController: UIViewController {
#IBOutlet weak var chronometre: UILabel!
#IBOutlet weak var prochainpointLabel: UILabel!
#IBOutlet weak var pointactuelLabel: UILabel!
#IBOutlet weak var point1Textfield: UITextField!
#IBOutlet weak var point1tempsTextfield: UITextField!
#IBOutlet weak var point2Textfield: UITextField!
#IBOutlet weak var point2tempsTextfield: UITextField!
var timer = NSTimer()
var seconds = point1tempsTextfield.text.toInt()
func subtractTime(dt:NSTimer){
seconds-- //Error
chronometre.text = "\(seconds)" //Error
if(seconds == 0) { //Error
seconds = point2tempsTextfield.text.toInt()
pointactuelLabel.text = point2Textfield.text
prochainpointLabel.text = nil
}
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func presenterButton(sender: AnyObject) {
pointactuelLabel.text = point1Textfield.text
prochainpointLabel.text = point2Textfield.text
chronometre.text = "\(seconds)" //Error
timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: ("subtractTime:"), userInfo: nil, repeats: true)
}
}
Thank you for your help, I am very new to coding and really appreciate it!

Answer 1

Forget about using a timer to calculate time. You should use NSTimeInterval between two dates to measure elapsed time.
ElapsedTime
extension NSTimeInterval {
var time:String {
return String(format:"%02d:%02d", Int((self/60.0)%60), Int((self) % 60 ))
}
}
var startTime:NSTimeInterval = 0
var elapsedTime:NSTimeInterval = 0
startTime = NSDate().timeIntervalSinceReferenceDate // 446644854.4675
sleep(3) //
elapsedTime = NSDate().timeIntervalSinceReferenceDate - startTime // 3.005680024623871
println(elapsedTime.time) "00:03"
// applying this concept to your code would look like this:
class ViewController: UIViewController {
#IBOutlet weak var chronometre: UILabel!
#IBOutlet weak var prochainpointLabel: UILabel!
#IBOutlet weak var pointactuelLabel: UILabel!
#IBOutlet weak var point1Textfield: UITextField!
#IBOutlet weak var point1tempsTextfield: UITextField!
#IBOutlet weak var point2Textfield: UITextField!
#IBOutlet weak var point2tempsTextfield: UITextField!
var timer = NSTimer()
var startTime:NSTimeInterval = 0
func updateTime(){
chronometre.text = (NSDate().timeIntervalSinceReferenceDate - startTime).time
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func presenterButton(sender: AnyObject) {
pointactuelLabel.text = point1Textfield.text
prochainpointLabel.text = point2Textfield.text
timer = NSTimer.scheduledTimerWithTimeInterval(1/10, target: self, selector: ("updateTime:"), userInfo: nil, repeats: true)
startTime = NSDate().timeIntervalSinceReferenceDate
}
}