Timer counts instantly instead of respecting interval - swift

Question

Im trying to make a countdown timer. everything works fine except that my timer does not count at regular intervals (1sec); instead it counts all the way down instantly giving me 0 every time. did a lot of search without luck. All examples I could find show similar timeInterval parameter.
var timer = Timer()
var remainingTime = 120
#objc func timerCount () {
if remainingTime > 0 {
while remainingTime > 0 {
remainingTime -= 1
timerLabel.text = String(remainingTime)
print(remainingTime)
}
} else {
timer.invalidate()
}
}
#IBAction func pauseButton(_ sender: Any) {
timer.invalidate()
}
#IBAction func playButton(_ sender: Any) {
timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(self.timerCount), userInfo: nil, repeats: true)
}

Answer 1

The reason your code is not working is that you have put an unnecessary while loop in your timerCount() method. You don't need to do this. Your timer will fire this method after each time interval. At very first call this while loop make your remainingTime to 0. This is why you are instantly getting 0 every time.
You just need to remove that while loop.

Answer 2

Can You try like this
var timer = Timer()
var remainingTime = 120
#objc func timerCount () {
let date = NSDate()
let nowdate = UserDefaults.standard.object(forKey: "NowDate") as! Date
let miniute = nowdate.timeIntervalSince(date as Date)
print(Int(miniute))
if (Int(miniute) == 0) {
timer.invalidate()
UserDefaults.standard.removeObject(forKey: "NowDate")
} else {
timerLabel.text = String(Int(miniute))
}
}
#IBAction func pauseButton(_ sender: Any) {
timer.invalidate()
UserDefaults.standard.removeObject(forKey: "NowDate")
}
#IBAction func playButton(_ sender: Any) {
let CurrentDate = NSDate()
let NowDate = CurrentDate.addingTimeInterval(TimeInterval(remainingTime))
UserDefaults.standard.set(NowDate, forKey: "NowDate")
timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(self.timerCount), userInfo: nil, repeats: true)
}