How do I set a label to a value from a separate table view controller? - swift

Question

So I'm setting up a timer in swift that takes text entered from another view controller. I'm not sure how to set the timer label as the value "timerTime" which has a member called "time" from another controller.
import UIKit
class ViewController: UIViewController, UITextFieldDelegate {
#IBOutlet weak var timerLabel: UILabel!
#IBOutlet weak var pauseButton: UIButton!
#IBOutlet weak var startButton: UIButton!
#IBOutlet weak var timerTaskName: UILabel!
#IBOutlet weak var timerTimeSetting: UILabel!
var timerTask: TaskData?
var timerTime: TaskData?
var seconds = 100
var timer = Timer()
var isTimerRunning = false
var resumeTapped = false
#IBAction func cancel(_ sender: Any) {
dismiss(animated: true, completion: nil)
}
#IBAction func startButtonTapped(_ sender: Any) {
if isTimerRunning == false {
runTimer()
self.startButton.isEnabled = false
}
}
func runTimer() {
timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: (#selector(ViewController.updateTimer)), userInfo: nil, repeats: true)
isTimerRunning = true
pauseButton.isEnabled = true
}
#IBAction func pauseButtonTapped(_ sender: UIButton) {
if self.resumeTapped == false {
timer.invalidate()
self.resumeTapped = true
self.pauseButton.setTitle("Resume",for: .normal)
} else {
runTimer()
self.resumeTapped = false
self.pauseButton.setTitle("Pause",for: .normal)
}
}
#IBAction func resetButtonTapped(_ sender: Any) {
timer.invalidate()
seconds = 60
self.timerLabel.text = timeString(time: TimeInterval(seconds))
if self.resumeTapped == true {
self.resumeTapped = false
self.pauseButton.setTitle("Pause",for: .normal)
}
isTimerRunning = false
pauseButton.isEnabled = false
startButton.isEnabled = true
}
func updateTimer() {
if seconds < 1 {
timer.invalidate()
//Send alert to indicate "time's up!"
} else {
seconds -= 1
timerLabel.text = timeString(time: TimeInterval(seconds))
}
}
func timeString(time:TimeInterval) -> String {
let hours = Int(time) / 3600
let minutes = Int(time) / 60 % 60
let seconds = Int(time) % 60
return String(format:"%02i:%02i:%02i", hours, minutes, seconds)
}
override func viewDidLoad() {
super.viewDidLoad()
pauseButton.isEnabled = false
if let task = timerTask {
timerTaskName.text = task.task
}
if let timerTimeLeft = timerTime {
timerTimeSetting.text = timerTimeLeft.time
}
self.timerLabel.text = timeString(time: TimeInterval(seconds))
}
}
Essentially I'm trying to get timerTimeLeft.time into my seconds variable. I've tried many different things but at I'm just stuck.

Answer 1

You need to add the timer to the runloop. This:
func runTimer() {
timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: (#selector(ViewController.updateTimer)), userInfo: nil, repeats: true)
isTimerRunning = true
pauseButton.isEnabled = true
}
Should be
func runTimer() {
timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: (#selector(ViewController.updateTimer)), userInfo: nil, repeats: true)
RunLoop.current.add(timer, forMode: .defaultRunLoopMode) // <-- Notice this
isTimerRunning = true
pauseButton.isEnabled = true
}