I'm trying to create a ticking noise what continues till you hit the minus button. The only problem I have is that I can't click on the minus button because the plus button stays pressed. It probably stays pressed because of the loop it can't get out of. Already thanks for the answers!
import UIKit
import AVFoundation
import AudioToolbox
import Foundation
class ViewController: UIViewController {
#IBOutlet weak var telLabel: UILabel!
var number = 0
var timeline = "no"
#IBAction func plus(_ sender: Any) {
number += 1
telLabel.text = "\(number)"
timeline = "yes"
tijdlijn()
}
func tijdlijn(){
while timeline == "yes"{
AudioServicesPlaySystemSound(SystemSoundID(1103))
sleep(2)
}
}
/* if timeline = "yes"{
repeat{
AudioServicesPlaySystemSound(SystemSoundID(1103))
sleep(3)
} while timeline == "yes"
*/
//4095
#IBAction func min(_ sender: Any) {
number -= 1
telLabel.text = "\(number)"
timeline = "no"
}
}
I suggest you to use Timer for tasks like this. Try to use this:
#IBOutlet weak var telLabel: UILabel!
var number = 0
var timeline = false
var timer: Timer!
#IBAction func plus(_ sender: Any) {
timeline = !timeline
if timeline {
number += 1
timer = Timer.scheduledTimer(timeInterval: 2, target: self, selector: #selector(self.tijdlijn), userInfo: nil, repeats: true)
} else {
number -= 1
timer.invalidate()
}
telLabel.text = "\(number)"
}
func tijdlijn(){
AudioServicesPlaySystemSound(SystemSoundID(1103))
}
And use only one action touchupinside - func plus. Remove minus touchupinside action.
You can make timeline a property of your class. And access it by self.timeline. This make it can be accessed in the class. When the timeline become unmatched, the loop will stoped.
Related
I've been struggling to figure this out for a few days: I need to create a timer that the user can't kill, so once they start it, even if they kill the app or it enters background, it will pick up where it left off, and to achieve this I am saving the date when the app terminated and then calculating the difference, so that part works fine.
The problem I keep running into however is that a second timer seems to start if I minimise the app and bring it back. I'm not sure how timers are managed in the background, but nothing of what I tried (calling timer.invalidate() when applicationWillResignActive gets called, calling it in deinit() ) seems to work. The behaviour I see after this is that the timer will count like this: 80 - 78 - 79 - 76 - 77..
There's also a problem where the timer will sometime run past the time it's supposed to run for after killing the app, but I can't find the exact cause for that because it doesn't always happen.
Any idea what I'm doing wrong?
Thanks a lot.
class Focus: UIViewController {
// MARK: Variables
var timer = Timer()
let timeToFocus = UserDefaults.standard.double(forKey: "UDTimeToFocus")
let currentFocusedStats = UserDefaults.standard.integer(forKey: "UDFocusStats")
// MARK: Outlets
#IBOutlet weak var progress: KDCircularProgress!
#IBOutlet weak var timeLabel: UILabel!
#IBOutlet weak var focusTimeLabel: UILabel!
#IBOutlet weak var stepNameLabel: UILabel!
#IBOutlet weak var focusAgain: UIButton!
#IBOutlet weak var allDone: UIButton!
#IBOutlet weak var help: UIButton!
#IBOutlet weak var dottedCircle: UIImageView!
// MARK: Outlet Functions
#IBAction func helpTU(_ sender: Any) { performSegue(withIdentifier: "ToFocusingHelp", sender: nil) }
#IBAction func helpTD(_ sender: Any) { help.tap(shape: .rectangle) }
#IBAction func allDoneTU(_ sender: Any) {
UserDefaults.standard.set(false, forKey: "UDFocusIsRunning")
UserDefaults.standard.set(false, forKey: "UDShouldStartFocus")
completeSession()
hero(destination: "List", type: .zoomOut)
}
#IBAction func allDoneTD(_ sender: Any) { allDone.tap(shape: .rectangle) }
#IBAction func focusAgainTU(_ sender: Any) {
UserDefaults.standard.set(currentFocusedStats + Int(timeToFocus), forKey: "UDFocusStats")
UserDefaults.standard.set(true, forKey: "UDShouldStartFocus")
initFocus()
}
#IBAction func focusAgainTD(_ sender: Any) { focusAgain.tap(shape: .rectangle) }
// MARK: Class Functions
#objc func initFocus() {
var ticker = 0.0
var angle = 0.0
var duration = 0.0
if UserDefaults.standard.bool(forKey: "UDShouldStartFocus") == true {
UserDefaults.standard.set(Date(), forKey: "UDFocusStartDate")
UserDefaults.standard.set(false, forKey: "UDShouldStartFocus")
ticker = timeToFocus
duration = timeToFocus
angle = 0.0
print("starting")
} else {
let elapsedTime = difference(between: UserDefaults.standard.object(forKey: "UDFocusStartDate") as! Date, and: Date())
let timeLeft = timeToFocus - elapsedTime
ticker = timeLeft
duration = timeLeft
angle = elapsedTime / (timeToFocus / 360)
}
// Timer
let timer = Timer.scheduledTimer(withTimeInterval: 1.0, repeats: true) { timer in
if ticker > 0 {
self.timeLabel.text = "\(Int(ticker))s"
ticker -= 1
}
}
timer.fire()
// Progress Circle
progress.animate(fromAngle: angle, toAngle: 360, duration: duration) { completed in
if completed { self.completeSession() }
}
// UI Changes
allDone.isHidden = true
focusAgain.isHidden = true
help.isHidden = false
}
func completeSession() {
// The timer gets fired every time, but this will invalidate it if it's complete
timer.invalidate()
timeLabel.text = "Done"
help.isHidden = true
allDone.isHidden = false
focusAgain.isHidden = false
}
// MARK: viewDidLoad
override func viewDidLoad() {
initFocus()
allDone.isHidden = true
focusAgain.isHidden = true
if timeToFocus < 3600 { focusTimeLabel.text = "Focusing for \(Int(timeToFocus/60)) minutes" }
else if timeToFocus == 3600 { focusTimeLabel.text = "Focusing for \(Int(timeToFocus/60/60)) hour" }
else { focusTimeLabel.text = "Focusing for \(Int(timeToFocus/60/60)) hours" }
stepNameLabel.text = UserDefaults.standard.string(forKey: "UDSelectedStep")
// This resumes the timer when the user sent the app in the background.
NotificationCenter.default.addObserver(self, selector: #selector(self.initFocus), name: NSNotification.Name(rawValue: "WillEnterForeground"), object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(self.fadeProgress), name: NSNotification.Name(rawValue: "WillEnterForeground"), object: nil)
}
#objc func fadeProgress(){
// This function is called both when the view will enter foreground (for waking the phone or switching from another app) and on viewWillAppear (for starting the app fresh). It will fade the progress circle and buttons to hide a flicker that occurs.
timeLabel.alpha = 0
dottedCircle.alpha = 0
progress.alpha = 0
allDone.alpha = 0
focusAgain.alpha = 0
DispatchQueue.main.asyncAfter(deadline: .now() + 0.2, execute: {
UIButton.animate(withDuration: 0.5, animations: {
self.timeLabel.alpha = 1
self.dottedCircle.alpha = 1
self.progress.alpha = 1
self.allDone.alpha = 1
self.focusAgain.alpha = 1
})
})
}
// MARK: viewWillAppear
override func viewWillAppear(_ animated: Bool) { fadeProgress() }
}
It seems the problem is that you create a local timer variable inside initFocus() but you call invalidate inside completeSession for another timer defined there:
class Focus: UIViewController {
// MARK: Variables
var timer = Timer()
I am trying to build a stopwatch which, for instance, will count to 3.0 seconds, stop, and then allow me to override the app's view with a new background/label. My issue is I cannot find a way for the timer to stop and pause on its own at 3 seconds - whenever I'd write the statement, it'd just continue counting and not do anything. Where would I put the statement in this code, and how would I write it?
import UIKit
class ViewController: UIViewController {
var time = 0.0
var timer = Timer()
#IBOutlet weak var lbl: UILabel!
#IBAction func start(_ sender: UIButton)
{
timer = Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: #selector(ViewController.action), userInfo: nil, repeats: false)
}
#IBAction func pause(_ sender: UIButton)
{
timer.invalidate()
}
#IBAction func reset(_ sender: UIButton)
{
timer.invalidate()
time = 0.0
lbl.text = ("0")
}
#objc func action()
{
time += 0.1
lbl.text = String(time)
}
}
Start by decoupling your expectations.
A "clock" is a container for the period of time from which it was started to now. Additionally, it could be "restarted", so it may need to know how long each previous run cycle was, this would then be added into the overall duration of the "clock"
The Timer is simply a way to run some code on periodical bases. Because a Timer only guarantees "at least" period, it should avoid been used for simple counter addition, as it can cause drift in your calculations (for a simple clock, it's probably not a big deal, but if you need any kind of precision, it's best to avoid it)
SimpleClock
import Foundation
public class SimpleClock {
internal var startedAt: Date? = nil
internal var totalRunningTime: TimeInterval = 0 // Used for pause/resume
var isRunning: Bool = false {
didSet {
if isRunning {
startedAt = Date()
} else {
totalRunningTime += currentCycleDuration
self.startedAt = nil
}
}
}
// This is the amount of time that this cycle has been running,
// that is, the amount of time since the clock was started to now.
// It does not include other cycles
internal var currentCycleDuration: TimeInterval {
guard let startedAt = startedAt else {
return 0
}
return Date().timeIntervalSince(startedAt)
}
func reset() {
isRunning = false
totalRunningTime = 0
}
// This is the "total" amount of time the clock has been allowed
// to run for, excluding periods when the clock was paused
var duration: TimeInterval {
return totalRunningTime + currentCycleDuration
}
}
Okay, this is pretty basic concept. It's just a container for recording when a "cycle" starts and stops and managing the "overall" duration (start/pause/resume cycles)
That's all fine and good, but what we really want is some way to determine if the period has "timeout" or not.
AlarmClock
import Foundation
class AlarmClock: SimpleClock {
var timeout: TimeInterval = 0
var hasExpired: Bool {
return duration >= timeout
}
var timeRemaining: TimeInterval {
return max(timeout - duration, 0)
}
}
All this does is add a concept of a "timeout" period and provides some additional functionality that allows use to easily determine if the clock has expired and the amount of time remaining
Example
Okay, that's all nice a good, but how does this work (and help us)
Okay, this is a really simple example. It has a label and two buttons. One button starts/pauses the clock and the other resets it.
The label displays both the running time and the remaining time of the alarm clock. If he clock expires, it will automatically be reset.
The class contains a Timer which periodically "ticks" and allows the code to inspect that current state of the alarm clock.
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var durationLabel: UILabel!
#IBOutlet weak var cycleButton: UIButton!
#IBOutlet weak var resetButton: UIButton!
let alarmClock: AlarmClock = {
let clock = AlarmClock()
clock.timeout = 10.0
return clock
}()
var timer: Timer? = nil
var durationFormatter: DateComponentsFormatter {
let formatter = DateComponentsFormatter()
formatter.allowedUnits = [.minute, .second]
formatter.unitsStyle = .abbreviated
return formatter
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func cycleClock(_ sender: Any) {
alarmClock.isRunning = !alarmClock.isRunning
if alarmClock.isRunning {
timer = Timer.scheduledTimer(timeInterval: 0.5, target: self, selector: #selector(tick), userInfo: nil, repeats: true)
} else {
timer?.invalidate()
timer = nil
}
updateDurationLabel()
updateCycleButtonState()
}
#IBAction func restartClock(_ sender: Any) {
timer?.invalidate()
timer = nil
alarmClock.reset()
updateDurationLabel()
updateCycleButtonState()
}
func updateCycleButtonState() {
if alarmClock.isRunning {
cycleButton.setTitle("Pause", for: [])
} else {
cycleButton.setTitle("Start", for: [])
}
}
func updateDurationLabel() {
durationLabel.text = "\(durationFormatter.string(from: alarmClock.duration)!)/\(durationFormatter.string(from: alarmClock.timeRemaining)!)"
}
#objc func tick() {
print("click")
updateDurationLabel()
if alarmClock.hasExpired {
restartClock(self)
}
}
}
Now, you could also add some kind of "internal" thread to periodically check the state of the clock and call a delegate which could then bee used to update the UI, but the intention here is the decoupling of the concerns, and this means you're not adding yet another thread to the system unnecessarily (not saying you couldn't do, but it's just one more level of complexity I didn't want to add ;))
I am developing a quiz app where the user is asked a question at random and must answer it on the initial view controller. If the user picks correctly, a second view controller appears which contains a button that pops the view controller off the navigation stack and goes back to the initial view controller to finish the other questions. However, I have a timer that I want to reset (start at 15s) every time that second view controller is popped and the initial view controller appears with the next question. How would I accomplish this task? I already have the countdown timer code in my swift file. I just need to know how to get it to start from scratch every time the second view controller is popped/removed.
Here's my code for the initial view controller:
import UIKit
extension ViewController: QuizCompletedDelegate {
func continueQuiz() {
randomQuestion()
}
}
class ViewController: UIViewController {
var questionList = [String]()
func updateCounter() {
counter -= 1
questionTimer.text = String(counter)
if counter == 0 {
timer.invalidate()
wrongSeg()
counter = 15
}
}
func randomQuestion() {
//random question
if questionList.isEmpty {
questionList = Array(QADictionary.keys)
}
let rand = Int(arc4random_uniform(UInt32(questionList.count)))
questionLabel.text = questionList[rand]
//matching answer values to go with question keys
var choices = QADictionary[questionList[rand]]!
questionList.remove(at: rand)
//create button
var button:UIButton = UIButton()
//variables
var x = 1
rightAnswerBox = arc4random_uniform(4)+1
for index in 1...4 {
button = view.viewWithTag(index) as! UIButton
if (index == Int(rightAnswerBox)) {
button.setTitle(choices[0], for: .normal)
} else {
button.setTitle(choices[x], for: .normal)
x += 1
}
randomImage()
}
}
let QADictionary = ["Who is Thor's brother?" : ["Atum", "Loki", "Red Norvell", "Kevin Masterson"], "What is the name of Thor's hammer?" : ["Mjolinr", "Uru", "Stormbreaker", "Thundara"], "Who is the father of Thor?" : ["Odin", "Sif", "Heimdall", "Balder"]]
//wrong view segue
func wrongSeg() {
performSegue(withIdentifier: "incorrectSeg", sender: self)
}
//proceed screen
func rightSeg() {
performSegue(withIdentifier: "correctSeg", sender: self)
}
//variables
var rightAnswerBox:UInt32 = 0
var index = 0
//Question Label
#IBOutlet weak var questionLabel: UILabel!
//Answer Button
#IBAction func buttonAction(_ sender: AnyObject) {
if (sender.tag == Int(rightAnswerBox)) {
rightSeg()
print ("Correct!")
}
if counter != 0 {
counter = 15
questionTimer.text = String(counter)
} else if (sender.tag != Int(rightAnswerBox)) {
wrongSeg()
print ("Wrong!")
timer.invalidate()
questionList = []
}
}
override func viewDidAppear(_ animated: Bool) {
randomQuestion()
}
//variables
var counter = 15
var timer = Timer()
#IBOutlet weak var questionTimer: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
timer = Timer.scheduledTimer(timeInterval: 1, target:self, selector: #selector(ViewController.updateCounter), userInfo: nil, repeats: true)
}
}
Here's the code to the second view controller:
class ContinueScreen: UIViewController {
var delegate: QuizCompletedDelegate?
//correct answer label
#IBOutlet weak var correctLbl: UILabel!
//background photo
#IBOutlet weak var backgroundImage: UIImageView!
func backToQuiz() {
delegate?.continueQuiz()
if let nav = self.navigationController {
nav.popViewController(animated: true)
} else {
self.dismiss(animated: true, completion: nil)
}
}
#IBAction func `continue`(_ sender: Any) {
backToQuiz()
}
override func viewDidLoad() {
super.viewDidLoad()
}
}
How to make countdown timer reset after button push on different view
controller?
So if you can get the reference of yourView controller where you have
setup the timer then you can access counter variable from previous
view controller inside your second viewController and when pushed the
button just reset to 0.
If above approach is not possible for you then another way is create
the static variable and access it anywhere and reset like this:-
static var counter = 0
if you are popping/removing the 2nd view controller and thus returning to the first, you could reset the timer in your viewDidAppearfunc in your 1st view controller. this way the timer restarts every time the view appears - the first time, and whenever the 2nd pops.
I have a Progress view bar that I would like to use to indicate time. This is my first project in Swift, and I am unsure how to go about this. So any help/ advise would be appreciated ...
(Using Xcode 7.2 and Swift 2.0)
Below Is my view controller. When 'btnPlaySession' is triggered, the content on the view controller is changed every 20 seconds. While the timer is counting to 20, id like to indicate this with the progress bar (so the progress bar resets, each time the content changes).
class CreatedSessionViewController: UIViewController {
var createdSession: [YogaPose]!
var poseDuration: Double = 20.00
var timer = NSTimer!()
var currentPoseIndex = 1
//Outlets:
#IBOutlet var poseProgressView: UIProgressView!
#IBOutlet var lblPoseCount: UILabel!
#IBOutlet var lblPoseName: UILabel!
#IBOutlet var imgPose: UIImageView!
#IBOutlet var tvDescription: UITextView!
// Do any additional setup after loading the view:
override func viewDidLoad() {
super.viewDidLoad()
displayFirstPoseInArray()
}
func displayFirstPoseInArray(){
lblPoseCount.text = (String(currentPoseIndex) + "/" + String(createdSession.count))
lblPoseName.text = createdSession[0].title
imgPose.image = UIImage(named: String(format: "%d.jpg", (createdSession[0].id)!))
tvDescription.text = createdSession[0].desc
}
#IBAction func btnPlaySession(sender: AnyObject) {
timer = NSTimer.scheduledTimerWithTimeInterval(poseDuration, target: self, selector: "getNextPoseData", userInfo: nil, repeats: true)
}
func getNextPoseData(){
if (currentPoseIndex < createdSession.count){
setProgressBar()
lblPoseCount.text = (String(currentPoseIndex + 1) + "/" + String(createdSession.count))
lblPoseName.text = createdSession[currentPoseIndex].title
imgPose.image = UIImage(named: String(format: "%d.jpg",(createdSession[currentPoseIndex].id)!))
tvDescription.text = createdSession[currentPoseIndex].desc
currentPoseIndex += 1
print(currentPoseIndex)
}
}
func setProgressBar(){
}
}
OK - so if you want the progress bar to update every second, then you need a timer that fires every second - but which does it 20 times, and calls setProgressBar as selector instead of getNextPoseData
within setProgressBar, you need to increment a class-level attribute, indexProgressBar perhaps, and simply set the progress bar attribute progress to 1.0 / indexProgressBar
if indexProgressBar == 20, then call getNextPoseData, and reset your progress bar
and here's a simplified version of how you might do that
class ViewController: UIViewController
{
#IBOutlet weak var progressBar: UIProgressView!
var timer = NSTimer!()
var poseDuration = 20
var indexProgressBar = 0
var currentPoseIndex = 0
override func viewDidLoad()
{
super.viewDidLoad()
// initialise the display
progressBar.progress = 0.0
}
#IBAction func cmdGo(sender: AnyObject)
{
// display the first pose
getNextPoseData()
// start the timer
timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: "setProgressBar", userInfo: nil, repeats: true)
}
func getNextPoseData()
{
// do next pose stuff
currentPoseIndex += 1
print(currentPoseIndex)
}
func setProgressBar()
{
if indexProgressBar == poseDuration
{
getNextPoseData()
// reset the progress counter
indexProgressBar = 0
}
// update the display
// use poseDuration - 1 so that you display 20 steps of the the progress bar, from 0...19
progressBar.progress = Float(indexProgressBar) / Float(poseDuration - 1)
// increment the counter
indexProgressBar += 1
}
}
For Continues loader
func setProgress() {
time += 0.1
ProgressBar.setProgress(time / 3, animated: true)
if time >= 3 {
self.time = 0.01
ProgressBar.progress = 0
let color = self.downloadProgressBar.progressTintColor
self.downloadProgressBar.progressTintColor = self.downloadProgressBar.trackTintColor
self.downloadProgressBar.trackTintColor = color
}
working on my first stopwatch app.
I currently have a play button, pause button, and stop button.
I'd like to combine the play and pause button so that they switch back and forth.
My code looks like this:
var timer = NSTimer()
var count = 0
func updateTime() {
count++
time.text = "\(count)"
}
#IBAction func pauseButton(sender: AnyObject) {
timer.invalidate()
}
#IBOutlet weak var time: UILabel!
#IBAction func stopButton(sender: AnyObject) {
timer.invalidate()
count = 0
time.text = "0"
}
#IBAction func playButton(sender: AnyObject) {
timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("updateTime"), userInfo: nil, repeats: true)
}
Any help is appreciated.
Try adding booleans. See my code below.
#IBOutlet weak var label: UILabel!
var time = NSTimer()
var count = 0
var running = false
func result (){
count++
label.text = String(count)
println(count)
}
#IBAction func playpause(sender: AnyObject) {
if running == false {
time = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("result"), userInfo: nil, repeats: true)
running = true }
else {
time.invalidate()
running = false
}
}
Hope this helps!
You'll have a variable bound to the button, something like this:
#IBOutlet var thePlayPauseButton : UIButton!
This button will be linked with some action:
#IBAction func togglePlayPauseButton (button: UIButton) {
// If we are 'paused', then play:
if button.titleLabel!.text == "Pause" {
button.titleLabel!.text = "Play"
// do actual play ...
timer = NSTimer.scheduledTimerWithTimeInterval (1,
target: self,
selector: Selector("updateTime"),
userInfo: nil,
repeats: true)
}
else if button.titleLabel!.text == "Play" {
button.titleLabel!.text = "Pause"
// do actual pause ...
timer.invalidate()
}
else { /* error */ }
}
Of course, structurally you can use a switch//case and you can perform the toggle behavior by calling your preexisting pause and play methods.
I know this post is somewhat dated, but I was working with the same problem and I came up with a slightly different answer and wanted to share it to help others. Here is what I came up with in toggling the pause and play buttons.
class ViewController: UIViewController {
var time = NSTimer()
var seconds = 0
var running = false
func timer() {
seconds++
timeLabel.text = "\(seconds)"
}
func playing() {
time = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("timer"), userInfo: nil, repeats: true)
running = true
}
func pausing() {
time.invalidate()
running = false
}
#IBOutlet weak var timeLabel: UILabel!
#IBAction func stopButton(sender: AnyObject) {
time.invalidate()
seconds = 0
timeLabel.text = "0"
}
#IBAction func pausePlayToggleButton(sender: AnyObject) {
if running == false {
return playing()
} else {
return pausing()
}
}
I had both a pause and play button and I essentially took their effects and placed them in functions and used them as return values for a single button.