I am trying to update a label using the NSTimer.scheduledTimerWithTimeInterval method although the timer works fine my label is not changing as it should, can someone tell me what I am doing wrong? code:
class Questions: UIViewController, UITextFieldDelegate {
var timerVal = 10
var timerLbl :UILabel!
var timer:NSTimer!
override func viewDidLoad() {
super.viewDidLoad()
startTimer()
}
func timerLabel() {
var timerLbl = UILabel(frame: CGRectMake(250, 20, 50, 50))
timerLbl.text = "\(10)"
timerLbl.textColor = UIColor.blackColor()
timerLbl.font = UIFont(name: Font.FuturaBlack, size: 30)
timerLbl.textAlignment = NSTextAlignment.Center
view.addSubview(timerLbl)
}
func updateTimer(dt:NSTimer) {
timerVal--
if timerVal == 0{
timerVal = 11
}else if timerVal < 0{
timer.invalidate()
} else{
println(timerString) //PRINTS CORRECT AS THE TIMER DECREASES BY ONE SECOND
timerLbl.text = "\(timerVal)" //NOTHING HAPPENS ON THE LABEL
}
}
func startTimer(){
timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("updateTimer:"), userInfo: nil, repeats: true)
}
}
the function timerLabel which creates your timerLbl is never called.
Related
I have searched answers in stackoverflow and none of them matches my needs. I am creating time tracking app on Swift Cocoa macOS, like Hubstaff time tracking app. At the moment runs a timer and I want to detect user's inactivity after x period of time and to send a Notification that he has been Idle x period of time. I'm new to iOS and macOS development. Can I have an example of how to do it?
Here is my code:
import Cocoa
class ViewController: NSViewController {
#IBOutlet weak var label: NSTextField!
#IBOutlet weak var playImage: NSButton!
var timer : Timer!
var isTimerWorking : Bool = false
var startTime : Date!
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func playPause(_ sender: NSButton) {
if isTimerWorking {
endTimer()
playImage.image = NSImage(named: NSImage.Name("play"))
sender.state = .off
} else {
startTimer()
playImage.image = NSImage(named: NSImage.Name("stop"))
sender.state = .off
}
}
func startTimer() {
startTime = Date()
timer = Timer.scheduledTimer(
timeInterval: 1.0,
target: self,
selector: #selector(self.timerCounter),
userInfo: nil,
repeats: true
)
isTimerWorking = true
}
func endTimer() {
if timer != nil {
timer.invalidate()
label.stringValue = "00:00:00"
}
isTimerWorking = false
}
#objc func timerCounter() {
let currentTime = Date().timeIntervalSince(startTime)
let hour = Int(fmod(currentTime/3600, 60))
let minute = Int(fmod(currentTime/60, 60))
let second = Int(fmod(currentTime, 60))
let hourValue = String(format:"%02d", hour)
let minuteValue = String(format:"%02d", minute)
let secondValue = String(format:"%02d", second)
label.stringValue = "\(hourValue):\(minuteValue):\(secondValue)"
}
}
In my own time tracking app I am using
var lastEvent:CFTimeInterval = 0
lastEvent = CGEventSource.secondsSinceLastEventType(CGEventSourceStateID.hidSystemState, eventType: CGEventType(rawValue: ~0)!)
print(lastEvent)
to get the user idle time.
The idea is simple and I do not think that the question has been asked in the past.
I want to build a simple mp3 player.
some songs displayed in a collection view the user selects a song
segue to another view with options to play, pause or stop only issue
is when you go back to the home screen to select a new song with the
current still playing. It is impossible to deactivate the current
player. When you need to play the 2 songs, the 2 are playing together
I have tried a lot of things
- create a new instance of player (player = AVAudioPlayer())
- player.pause() and player.play()
I do not see what I am doing wrong really.
this is my code :
import UIKit
import AVFoundation
class LecteurViewController: UIViewController {
var chansonSelected: Chanson? = nil
var lecteur:AVAudioPlayer = AVAudioPlayer()
var timer1 = Timer()
var timer2 = Timer()
#IBOutlet weak var dureeChansonSlider: UISlider!
#IBOutlet weak var chansonImageView: UIImageView!
#IBOutlet weak var chansonVolumeSlider: UISlider!
#IBOutlet weak var debutLabel: UILabel!
#IBOutlet weak var finLabel: UILabel!
#IBAction func stopMusicAction(_ sender: UIBarButtonItem) {
var player = AVAudioPlayer()
lecteur.stop()
LecteurManager.isActive = false
}
#IBAction func pauseMusicAction(_ sender: UIBarButtonItem) {
var player = AVAudioPlayer()
lecteur.pause()
LecteurManager.isActive = false
}
#IBAction func jouerMusicAction(_ sender: UIButton) {
if LecteurManager.isActive {
changeSong()
print("lecteur déjà en cours")
} else {
var player = AVAudioPlayer()
lecteur.play()
}
print(LecteurManager.isActive )
LecteurManager.isActive = true
}
func changeSong() {
lecteur.stop()
//lecteur = AVAudioPlayer()
jouerLecteurMp3()
print(chansonSelected!)
lecteur.play()
}
override func viewDidLoad() {
super.viewDidLoad()
configureView()
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
jouerLecteurMp3()
}
func configureView() {
self.title = (chansonSelected!.titre!).capitalized
chansonImageView.image = UIImage(named: "\(chansonSelected!.image).jpgs")
//formatter 'back' button
let backBtn = UIBarButtonItem(title: "< Playlist", style: .plain, target: self, action: #selector(LecteurViewController.reset(_sender:)))
self.navigationItem.leftBarButtonItem = backBtn
self.navigationController?.navigationBar.tintColor = UIColor.white
//contrôler volume chanson
chansonVolumeSlider.addTarget(self, action: #selector(LecteurViewController.ajusterVolume(_ :)), for: UIControlEvents.valueChanged)
//contrôler durée chanson
dureeChansonSlider.addTarget(self, action: #selector(LecteurViewController.ajusterDurée(_ :)), for: UIControlEvents.valueChanged)
updateUI()
}
func updateUI() {
//indiquer position chanson
timer1 = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(LecteurViewController.mettreAJourDurée), userInfo: nil, repeats: true)
//afficher durée chanson
timer2 = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(LecteurViewController.afficherDurée), userInfo: nil, repeats: true)
}
func reset(_sender:UIBarButtonItem) {
self.navigationController?.popViewController(animated: true)
}
func ajusterVolume(_ sender:UISlider) {
//print("volume ajusté \(chansonVolumeSlider.value)")
lecteur.volume = chansonVolumeSlider.value
}
func ajusterDurée(_ sender:UISlider) {
lecteur.currentTime = TimeInterval(dureeChansonSlider.value)
}
func mettreAJourDurée() {
dureeChansonSlider.value = Float(lecteur.currentTime)
}
func afficherDurée() {
print("durée actuelle: \(lecteur.duration - lecteur.currentTime)")
debutLabel.text = retournerPositionActuelle()
finLabel.text = retournerDureeTotal()
}
func retournerPositionActuelle() -> String {
let seconds = Int(lecteur.currentTime) % 60
let minutes = (Int(lecteur.currentTime) / 60) % 60
return String(format: "%0.2i:%0.2i", minutes, seconds)
}
func retournerDureeTotal() -> String {
let seconds = Int(lecteur.currentTime) % 60
let minutes = (Int(lecteur.currentTime) / 60) % 60
return String(format: "%0.2i:%0.2i", minutes, seconds)
}
func jouerLecteurMp3() {
let chanson = "bensound-\(chansonSelected!.titre!)"
let fichierMp3 = Bundle.main.path(forResource: chanson, ofType: "mp3")
do {
try lecteur = AVAudioPlayer(contentsOf: URL(string: fichierMp3!)!)
dureeChansonSlider.maximumValue = Float(lecteur.duration)
} catch {
print("erreur lecture mp3")
}
}
}
Try this:
func reset(_sender:UIBarButtonItem)
{
self.navigationController?.popViewController(animated: true)
lecteur.stop()
}
I want my countdown timer to suspend and then resume when the app leaves / returns to focus, using the time away to calculate how much time should be deducted.
I am using the app delegate file (not sure thats the right location? or if they are meant to be in the view controllers file as functions of their own?)
Issue is im getting a lot of errors such as:
Value of type 'AppDelegate' has no member 'restTimer'
Use of unresolved identifier 'nextFireDate'
Use of unresolved identifier 'selector'
restTimer was declared as a timer in my view controllers file but when i tried these blocks in that file i got an equal number of errors for unresolved identifiers
and using the following 2 code blocks
func applicationWillResignActive(_ application: UIApplication) {
guard let t = self.restTimer else { return }
nextFireDate = t.fireDate
t.invalidate()
and
func applicationDidBecomeActive(_ application: UIApplication) {
guard let n = nextFireDate else { return }
let howMuchLonger = n.timeIntervalSinceDate(NSDate())
if howMuchLonger < 0 {
print("Should have already fired \(howMuchLonger) seconds ago")
target!.performSelector(selector!)
} else {
print("should fire in \(howMuchLonger) seconds")
Timer.scheduledTimerWithTimeInterval(howMuchLonger, target: target!, selector: selector!, userInfo: nil, repeats: false)
}
}
UPDATE: Added full views code due to issue incorporating the answer
import Foundation
import UIKit
class RestController: UIViewController {
#IBOutlet weak var restRemainingCountdownLabel: UILabel!
#IBOutlet weak var setsRemainingCountdownLabel: UILabel!
#IBOutlet weak var numberOfSetsLabel: UILabel!
#IBOutlet weak var numberOfRestLabel: UILabel!
#IBOutlet weak var adjustSetsStepper: UIStepper!
#IBOutlet weak var adjustRestStepper: UIStepper!
var startDate: Date!
let startDateKey = "start.date"
let interval = TimeInterval(20)
var restTimer: Timer!
var restCount = 0
var setCount = 0
var selectedTime = 1
var selectedSets = 1
private let resignDateKey = "resign.date"
#IBAction func endSetPressed(_ sender: Any) {
if (setCount > 0){
setCount -= 1
setsRemainingCountdownLabel.text = String(setCount)
}
handleTimer()
}
#IBAction func setStepperValueChanged(_ sender: UIStepper) {
numberOfSetsLabel.text = Int(sender.value).description
self.setCount = Int(sender.value)
self.selectedSets = setCount
setsRemainingCountdownLabel.text = String(setCount)
}
#IBAction func restStepperValueChanged(_ sender: UIStepper) {
numberOfRestLabel.text = Int(sender.value).description
let timeMinSec = timeFormatted(totalSeconds: Int(sender.value)*60)
restRemainingCountdownLabel.text = timeMinSec
self.selectedTime = Int(sender.value)
restCount = self.selectedTime * 60
}
#IBAction func resetSetsButton(_ sender: Any) {
setCount = Int(adjustSetsStepper.value)
setsRemainingCountdownLabel.text = String(setCount)
}
override func viewDidLoad() {
super.viewDidLoad()
numberOfSetsLabel.text = String(selectedSets)
numberOfRestLabel.text = String(selectedTime)
createTimer(interval: interval)
NotificationCenter.default.addObserver(self, selector: #selector(willResignActive), name: NSNotification.Name.UIApplicationWillResignActive, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(didBecomeActive), name: NSNotification.Name.UIApplicationDidBecomeActive, object: nil)
}
deinit {
NotificationCenter.default.removeObserver(self)
}
#objc private func willResignActive(notification: Notification) {
print("resigning")
guard restTimer.isValid else {
UserDefaults.standard.removeObject(forKey: startDateKey)
return
}
restTimer.invalidate()
UserDefaults.standard.set(Date(), forKey: startDateKey)
}
#objc private func didBecomeActive(notification: Notification) {
print("resume")
if let startDate = UserDefaults.standard.object(forKey: startDateKey) as? Date {
let elapsed = -startDate.timeIntervalSinceNow
print("elpased time: \(elapsed) remaining time: \(interval - elapsed)")
if elapsed > interval {
timerUp()
} else {
createTimer(interval: interval - elapsed)
}
}
}
private func createTimer (interval: TimeInterval) {
restTimer = Timer.scheduledTimer(withTimeInterval: interval , repeats: false) {[weak self] _ in
self?.timerUp()
}
startDate = Date()
}
private func timerUp() {
print("At least \(interval) seconds has elapsed")
}
func handleSets() {
if (setCount > 0) {
self.restCount = self.selectedTime * 60
}
handleTimer()
}
func handleTimer() {
if (restTimer?.isValid ?? false) {
restTimer?.invalidate()
restTimer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(RestController.updateTimer), userInfo: nil, repeats: true)
} else {
restTimer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(RestController.updateTimer), userInfo: nil, repeats: true)
}
}
func updateTimer() {
if (restCount > 0){
restCount -= 1
} else if (restCount == 0){
restTimer?.invalidate()
}
restRemainingCountdownLabel.text = timeFormatted(totalSeconds: restCount)
}
func timeFormatted(totalSeconds: Int) -> String {
let seconds: Int = totalSeconds % 60
let minutes: Int = (totalSeconds / 60) % 60
return String(format: "%02d:%02d", minutes, seconds)
}
I think you cannot rely on the fact that the app will remain in memory while it is in the background. Thus, you should archive all the data you need to recreate the timer at the exact point.
For example, in applicationWillResignActive
UserDefaults.standard.set(value: t.nextFireDate forKey:"NextFireDate")
and in applicationWillEnterForeground
if let fireDate = UserDefaults.standard.object(forKey: "NextFireDate") {
// setup a timer with the correct fire date
}
You don't have to use the AppDelegate for this because it also posts notifications. You can use the AppDelegate if you want. Here is code using notifications:
class ViewController: UIViewController{
private let startDateKey = "start.date"
private let interval = TimeInterval(20)
private var startDate: Date!
private var timer: Timer!
override func viewDidLoad() {
super.viewDidLoad()
createTimer(interval: interval)
NotificationCenter.default.addObserver(self, selector: #selector(willResignActive), name: NSNotification.Name.UIApplicationWillResignActive, object: nil)
NotificationCenter.default.addObserver(self, selector: #selector(didBecomeActive), name: NSNotification.Name.UIApplicationDidBecomeActive, object: nil)
}
deinit {
NotificationCenter.default.removeObserver(self)
}
#objc private func willResignActive(notification: Notification) {
print("resigning")
guard timer.isValid else {
UserDefaults.standard.removeObject(forKey: startDateKey)
return
}
timer.invalidate()
UserDefaults.standard.set(Date(), forKey: startDateKey)
}
#objc private func didBecomeActive(notification: Notification) {
print("resume")
if let startDate = UserDefaults.standard.object(forKey: startDateKey) as? Date {
let elapsed = -startDate.timeIntervalSinceNow
print("elpased time: \(elapsed) remaining time: \(interval - elapsed)")
if elapsed > interval {
timerUp()
} else {
createTimer(interval: interval - elapsed)
}
}
}
private func createTimer (interval: TimeInterval) {
timer = Timer.scheduledTimer(withTimeInterval: interval , repeats: false) {[weak self] _ in
self?.timerUp()
}
startDate = Date()
}
private func timerUp() {
print("At least \(interval) seconds has elapsed")
}
}
I am trying to make my label flash two colors on repeat. I want it to continuously repeat the text color Blue and Black. Is this possible? And can someone help me do this?
You can do it by using NSTimer and below is complete code for that:
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var lbl: UILabel!
var timer : NSTimer?
override func viewDidLoad() {
super.viewDidLoad()
timer = NSTimer.scheduledTimerWithTimeInterval(0.4, target: self, selector: "update", userInfo: nil, repeats: true)
}
var textColorIsBlue = false
func update() {
if !textColorIsBlue {
lbl.textColor = UIColor.blueColor()
} else {
lbl.textColor = UIColor.blackColor()
}
textColorIsBlue = !textColorIsBlue
}
}
And your result will be:
And you can modify timer as per your need.
And whenever you don't need time you can stop it by using timer?.invalidate().
I couldn't help but create an alternative example
class ViewController: UIViewController {
#IBOutlet private var label: UILabel! {
didSet {
label.text = "This is just some sample text"
}
}
private var timer: dispatch_source_t?
private var generator: AlternatingColorGenerator?
deinit {
guard let timer = timer else { return }
dispatch_source_cancel(timer)
}
override func viewDidLoad() {
super.viewDidLoad()
generator = AlternatingColorGenerator(colors: [.redColor(), .blueColor(), .greenColor()])
let t = repeatingTimer(1, queue: dispatch_get_main_queue()) { [weak self] () -> Void in
self?.label.textColor = self?.generator?.next()
}
dispatch_resume(t)
timer = t
label.textColor = generator?.next()
}
}
private class AlternatingColorGenerator: GeneratorType {
var currentIndex: Int = 0
let numberOfColors: Int
let colors: [UIColor]
init(colors: [UIColor]) {
self.colors = colors
numberOfColors = colors.count
}
func next() -> UIColor? {
let color = colors[currentIndex]
currentIndex = (currentIndex + 1) % numberOfColors
return color
}
}
private func repeatingTimer(interval: NSTimeInterval, queue: dispatch_queue_t, action: () -> Void) -> dispatch_source_t {
let timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, queue)
let timerInterval = UInt64(interval) * NSEC_PER_SEC
let timerLeeway = timerInterval / 10
dispatch_source_set_event_handler(timer, action)
dispatch_source_set_timer(timer, DISPATCH_TIME_NOW, timerInterval, timerLeeway)
return timer
}
This uses a GCD timer, rather than an NSTimer, and rather than toggle the colours with a method, I've created a generator.
This uses a different programming style: one where the generation of things (timers and colours to use) is separated from the place where they are consumed.
This question already has answers here:
How to use NSTimer to fire off multiple times?
(4 answers)
Closed 7 years ago.
I have the code bellow and I am finding a error message. Note that the code in question is not in the viewcontroller class in Swift. The images code for moving is in the viewdidappear function.
var timer = NSTimer(timeInterval:3, target: self, selector:Selector("randomnumbers:"), userInfo: nil, repeats: true)
func randomnumbers(timer:NSTimer) {
var rockNamesArray:[String] = ["bird", "rock2", "rock3"]
var rockpos = Int(arc4random_uniform(UInt32(3)))
}
Edit:
if rockNamesArray[rockpos] == "rock2" {
UIView.animateWithDuration(3.0, animations: {
self.mrock.frame = CGRect(origin: CGPoint(x: 167, y: 600), size: self.mrock.frame.size)
},
completion: { _ in
self.mrock.frame = moriginalFrame
})
}
First you have to declare your timer at your view controller class:
var timer = NSTimer()
var rockNamesArray:[String] = []
var rockpos = 0
then at viewDidLoad you schedule the timer:
override func viewDidLoad() {
super.viewDidLoad()
timer = NSTimer.scheduledTimerWithTimeInterval(3, target: self, selector: "randomnumbers", userInfo: nil, repeats: true)
}
//
func randomnumbers() {
rockNamesArray = ["bird", "rock2", "rock3"]
rockpos = Int(arc4random_uniform(UInt32(rockNamesArray.count)))
}