nested if statement in swift function - swift

Question

The following function counts down a red to green light, then counts the reaction time for the user to hit a button after the green light is displayed.
func updateCounter() {
timerInt -= 1
if timerInt == 2{
light.image = UIImage(named: "r.png")
} else if timerInt == 1 {
light.image = UIImage(named: "yellow.png")
} else if timerInt == 0 {
light.image = UIImage(named: arc4random_uniform(2) == 0 ? "no.png" : "g.png")
timer.invalidate()
startStop.isEnabled = true
scoreTimer = Timer.scheduledTimer(timeInterval: 0.0001, target: self, selector: #selector(ViewController.updateScoreTime), userInfo: nil, repeats: true)
}
}
Where it states else if timerInt == 0, the user is given a random function. An image will either turn green or an "x" is displayed.
If the x is displayed, I would like the user to to have to hit a button that states game over to restart the red light sequence.
If a green light is displayed, I would like the user to have to test their reaction time.
This is how the function already runs now, except it does not change if the x is displayed. I guess I would like the function to run as follows:
if timeInt == 0 and green light is chosen
then run test reaction time
else if timeInt == 0 and x is chosen
then end reaction time and run game over button
How can I achieve this?

Answer 1

I am not exactly sure what you are trying to achieve, so I did my best. Try this:
func updateCounter() {
timerInt -= 1
if timerInt == 2{
light.image = UIImage(named: "r.png")
} else if timerInt == 1 {
light.image = UIImage(named: "yellow.png")
} else if timerInt == 0 {
let green = (arc4random_uniform(2) == 0)
light.image = UIImage(named: (green ? "g.png" : "no.png"))
if green {
// run test reaction time
} else {
//end reaction time and run game over button
}
// NOTE: Do you mean `scoreTimer.invalidate()`?
timer.invalidate()
startStop.isEnabled = true
// NOTE: This time interval seems WAY too small ↓↓↓↓↓↓: it is only a millisecond!
scoreTimer = Timer.scheduledTimer(timeInterval: 0.0001, target: self, selector: #selector(ViewController.updateScoreTime), userInfo: nil, repeats: true)
}
}
Replace the first two comments (aka lines beginning with //) with the appropriate code, and take note of the third and fourth comments.