ZDP ZDP - 1 year ago 47
Swift Question

Timer going into negatives/not reseting

I am trying to set a countdown timer for my app. My code works so that every time the image whiteDot is dragged and containing smallDot the countdown begins, and smallDot is spawned in a random position on screen. I have a couple questions

1.) I am trying to get the timer to reset to 2 seconds after every time the "if (whiteDot.frame.contains(smallDot.frame) && smallDot.image != nil)" statement is executed.

2.) Everytime the "if" statement is executed once, it counts down normally, but when it is executed again before the countdown hits zero, it starts going into negative numbers and counting faster than 1 second.

import UIKit

var timeClock = 2

class SecondViewController: UIViewController {

func startTimer() {
timeClock -= 1
time.text = "Time: " + String(timeClock)

if whiteDot.frame.contains(smallDot.frame) && timeClock > 0 {
timeClock = 2
}

else if timeClock == 0 || timeClock < 0 {
timer.invalidate()
}
}

var timer = Timer()

@IBAction func handlePan(recognizer:UIPanGestureRecognizer) {
let translation = recognizer.translation(in: self.view)
if let view = recognizer.view {
view.center = CGPoint(x:view.center.x + translation.x,
y:view.center.y + translation.y)
}
recognizer.setTranslation(CGPoint.zero, in: self.view)

if (whiteDot.frame.contains(smallDot.frame) && smallDot.image != nil) {
addOne += 1

score.text = "\(addOne)"

smallDot.center = spawnRandomPosition()

timeClock = 2
if timeClock == 0 || timeClock < 0 {
timer.invalidate()
}
else if timeClock > 0 && (whiteDot.frame.contains(smallDot.frame)){
timeClock = 2

}
timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(SecondViewController.action), userInfo: nil, repeats: true)
}
}

ZDP ZDP
Answer Source

Just found out my problem. I wasn't reseting the timer the timer at all. First I was trying to reset it in the 'action' function, but I just had to move it down to the bottom if statement to solve all of my problems. This code works for anybody who is trying to reset their timer when ever a certain action occurs.

class SecondViewController: UIViewController
{
 var addOne = 0

func startTimer() {

    timeClock -= 1

    time.text =  "Time: " + String(timeClock)

   if timeClock <= 0 {
    timer.invalidate()
    //show game over
    }
}

func resetTimer() {
    timer.invalidate()
    timeClock = 3
}
var timer = Timer()

 @IBAction func handlePan(recognizer:UIPanGestureRecognizer) {
    let translation = recognizer.translation(in: self.view)
    if let view = recognizer.view {
        view.center = CGPoint(x:view.center.x + translation.x,
                              y:view.center.y + translation.y)
    }
    recognizer.setTranslation(CGPoint.zero, in: self.view)

    if (whiteDot.frame.contains(smallDot.frame) && smallDot.image != nil) {
        addOne += 1

  score.text = "\(addOne)"

        resetTimer()

        timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(SecondViewController.startTimer), userInfo: nil, repeats: true)

        smallDot.center = spawnRandomPosition()   
    }
    }
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