How to countdown time for every islamic prayer - ios

Question

I make my iOS app islamic prayer, so I need to View countdown time next prayer.
this is code from Adhan project:
so I have 5 prayer for every day, and I need countdown time between every prayer.
func formattedPrayerTime(prayer: Prayer, times: PrayerTimes?) -> some View {
guard let time = times?.time(for: prayer) else {
return Text("-")
}
return Text("\(time, formatter: dateFormatter)")
}
func formattedPrayerName(prayer: Prayer) -> some View {
switch prayer {
case .fajr:
return Text("Fajr")
case .sunrise:
return Text("Sunrise")
case .dhuhr:
return Text("Dhuhr")
case .asr:
return Text("Asr")
case .maghrib:
return Text("Maghrib")
case .isha:
return Text("Isha")
}
}
}

Answer 1

I use something like this before
in viewdidload in releasedate prayer time and add target for #objc func
update time func will automatically will updated if time changed every second ( timeInterval ) in scheduledTimer
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
let releaseDateString = "7:07:43" // <- prayer time
let releaseDateFormatter = DateFormatter()
releaseDateFormatter.dateFormat = "HH:mm:ss"
releaseDate = releaseDateFormatter.date(from: releaseDateString)! as NSDate
countdownTimer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(updateTime), userInfo: nil, repeats: true)
}
#objc func updateTime() {
let currentDate = Date()
let calendar = Calendar.current
let diffDateComponents = calendar.dateComponents([.hour, .minute, .second], from: currentDate, to: releaseDate! as Date)
DispatchQueue.global().sync
{
hours.text = "\(diffDateComponents.hour ?? 0)"
min.text = "\(diffDateComponents.minute ?? 0)"
sec.text = "\(diffDateComponents.second ?? 0)"
}
you can use SwiftDate also it's awesome library

Answer 2

You could use this function:
func timeUntilNextPrayer(_ nextPrayer: Date) {
Timer.scheduledTimer(withTimeInterval: 1, repeats: true) { timer in
let difference = Calendar.current.dateComponents([.hour, .minute, .second], from: Date(), to: nextPrayer)
print(difference)
if nextPrayer == Date() {
timer.invalidate()
}
}
}
Call this function by passing the next prayer time as parameter. Example:
timeUntilNextPrayer(Date().addingTimeInterval(50))