Count-Up and Count-Down Timer with Date() in Swift 4 should stop after a certain time period - ios

Question

I am quite new to Swift and already learned a lot using the questions here.
In one of my first projects I try to write a soccer playtime timer app. The first timer is counting up after the whistle button is pressed showing the minutes played and the second timer is counting down to zero showing the minutes left to play. This works so far.
Now both timers should stop automatically when the halftime is over, so that I can start a third overtime timer. So far the invalidate statement of the timer is not working - both timers keep running. There seems to be something wrong with my if-statements, but at the moment I have no clue what. So any help would be very appreciated.
var countUpClock: Timer?
var countDownClock: Timer?
private var formatter: DateComponentsFormatter = {
let formatter = DateComponentsFormatter()
formatter.unitsStyle = .positional
formatter.allowedUnits = [.minute, .second]
formatter.zeroFormattingBehavior = .pad
return formatter
}()
func runPlaytimeClocks() {
let startTime = Date()
let countTime = Date() + 2700 //45min of playtime
if startTime <= countTime {
countUpClock = Timer.scheduledTimer(withTimeInterval: 1.0, repeats: true) { [weak self] _ in
self?.timePlayed.text = self?.formatter.string(from: startTime, to: Date())
}
}
else {
countUpClock?.invalidate()
}
if startTime <= countTime {
countDownClock = Timer.scheduledTimer(withTimeInterval: -1.0, repeats: true) { [weak self] _ in
self?.timetoPlay.text = self?.formatter.string(from: Date(), to: countTime)
}
}
else {
countDownClock?.invalidate()
}

Answer 1

Thank you very much for the replies.
I found exactly what I was looking for here: http://ioscake.com/swift-nstimer-in-background.html
I adapted the solution to my for clocks (CountUpClock, CountDownClock, OvertimeClock, HalftimeClock).
Do you have any suggestions what would be the best solution to start the second halftime of the soccer game?
So far the CountUpClock starts again at 0:00 when I press the whistle button after the halftime break. But it should keep running from minute 45:00 to 90:00 - while the CountDownClock should counting down from 45:00 to 0:00 again.
What would be the best solution for such a behaviour?
import UIKit
import UserNotifications
private let stopTimeKey = "stopTimeKey"
class ViewController: UIViewController {
//Outlets
#IBOutlet weak var timePlayed: UILabel!
#IBOutlet weak var timeToPlay: UILabel!
#IBOutlet weak var overtime: UILabel!
#IBOutlet weak var halftime: UILabel!
#IBOutlet weak var halftimeButton: UIButton!
private var stopTime: Date?
override func viewDidLoad() {
super.viewDidLoad()
registerForLocalNotifications()
stopTime = UserDefaults.standard.object(forKey: stopTimeKey) as? Date
if let time = stopTime {
if time > Date() {
startTimers(time, includeNotification: false)
} else {
notifyTimerCompleted()
}
}
}
private func registerForLocalNotifications() {
if #available(iOS 10, *) {
UNUserNotificationCenter.current().requestAuthorization(options: [.alert, .sound]) { granted, error in
guard granted && error == nil else {
// display error
print("\(String(describing: error))")
return
}
}
} else {
let types: UIUserNotificationType = [.badge, .sound, .alert]
let settings = UIUserNotificationSettings(types: types, categories: nil)
UIApplication.shared.registerUserNotificationSettings(settings)
}
}
//Actions
#IBAction func whistleButtonTapped(_ sender: UIButton) {
overtimeClock?.invalidate()
overtimeClock = nil
halftimeClock?.invalidate()
halftimeClock = nil
overtime.text = "00:00"
halftime.text = "00:00"
halftimeButton.isHidden = true
//add 10 seconds per halftime to try out
let time = Date() + 10
if time > Date() {
startTimers(time)
} else {
timeToPlay.text = "error"
}
}
#IBAction func halftimeButton(_ sender: UIButton) {
halftimeButtoPressed()
}
// Code for different Timers
private var countDownClock: Timer?
private var countUpClock: Timer?
var overtimeClock: Timer?
var halftimeClock: Timer?
private func startTimers(_ stopTime: Date, includeNotification: Bool = true) {
// save `stopTime` in case app is terminated
UserDefaults.standard.set(stopTime, forKey: stopTimeKey)
self.stopTime = stopTime
// start Timer
countDownClock = Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: #selector(handleCountDownTimer(_:)), userInfo: nil, repeats: true)
countUpClock = Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: #selector(handleCountUpTimer(_:)), userInfo: nil, repeats: true)
guard includeNotification else { return }
// start local notification (so we're notified if timer expires while app is not running)
if #available(iOS 10, *) {
let content = UNMutableNotificationContent()
content.title = "Overtime is starting soon"
content.body = "In 5 seconds the overtime will start"
content.sound = UNNotificationSound.default()
//5 seconds warning before overtime starts
let trigger = UNTimeIntervalNotificationTrigger(timeInterval: stopTime.timeIntervalSinceNow - 5, repeats: false)
let notification = UNNotificationRequest(identifier: "timer", content: content, trigger: trigger)
UNUserNotificationCenter.current().add(notification)
} else {
let notification = UILocalNotification()
//5 seconds warning before overtime starts
notification.fireDate = stopTime - 5
notification.alertBody = "Overtime is starting soon"
UIApplication.shared.scheduleLocalNotification(notification)
}
}
private func stopTimer() {
countDownClock?.invalidate()
countDownClock = nil
countUpClock?.invalidate()
countUpClock = nil
}
private func halftimeButtoPressed() {
overtimeClock?.invalidate()
overtimeClock = nil
startHalftimeClock()
halftimeButton.isHidden = true
}
private let dateComponentsFormatter: DateComponentsFormatter = {
let _formatter = DateComponentsFormatter()
_formatter.allowedUnits = [.minute, .second]
_formatter.unitsStyle = .positional
_formatter.zeroFormattingBehavior = .pad
return _formatter
}()
#objc func handleCountDownTimer(_ timer: Timer) {
let now = Date()
if stopTime! > now {
timeToPlay.text = dateComponentsFormatter.string(from: now, to: stopTime!)
} else {
stopTimer()
notifyTimerCompleted()
startOvertimeClock()
halftimeButton.isHidden = false
}
}
#objc func handleCountUpTimer(_ timer: Timer) {
//add 10 seconds per halftime to try out
let now = Date() + 10
if now > stopTime! {
timePlayed.text = dateComponentsFormatter.string(from: stopTime!, to: now)
} else {
stopTimer()
notifyTimerCompleted()
}
}
//Overtime Clock
#objc func startOvertimeClock() {
let startOvertime = Date()
overtimeClock = Timer.scheduledTimer(withTimeInterval: 0.1, repeats: true) { [weak self] _ in
self?.overtime.text = self?.dateComponentsFormatter.string(from: startOvertime, to: Date())
}
}
//Halftime Clock
#objc func startHalftimeClock() {
let startHalftime = Date()
halftimeClock = Timer.scheduledTimer(withTimeInterval: 0.1, repeats: true) { [weak self] _ in
self?.halftime.text = self?.dateComponentsFormatter.string(from: startHalftime, to: Date())
}
}
private func notifyTimerCompleted() {
timeToPlay.text = "End"
timePlayed.text = "End"
}
}