I'm having problem animate UISlider as a MPMusicPlayer playback progress. I've seen many post accomplishing this on obj-c and AVAudioPlayer.
I've tried this:
func startTimer(){
if timer == nil {
timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: Selector("update:"), userInfo: nil,repeats: true)
timer.fire()
}
}
func stopTimer(){
timer.invalidate()
}
func update(timer: NSTimer){
if myMusicPlayer?.playbackState == MPMusicPlaybackState.Playing{
return
}
var minute_ = abs(Int((myMusicPlayer!.currentPlaybackTime / 60) % 60))
var second_ = abs(Int(myMusicPlayer!.currentPlaybackTime % 60))
var minute = minute_ > 9 ? "\(minute_)" : "0\(minute_)"
var second = second_ > 9 ? "\(second_)" : "0\(second_)"
progressTimerLabel.text = "\(minute):\(second)"
progressBar.value = CFloat(myMusicPlayer!.currentPlaybackTime)
}
ProgressBar is my UISlider.
I called startTimer() when I play the audio, but it still not animate at all. What can I do so it animate the UISlider?
Related
While coming to a view I call a function to load a timer like so...
var count = 10
func startTimer() {
timer = Timer.scheduledTimer(timeInterval: 0.4, target: self, selector: #selector(self.update), userInfo: nil, repeats: true)
}
and update function is given as..
#objc func update() {
while (count != 0) {
count -= 1
countdownLabel.text = "\(count)"
}
timer.invalidate()
}
But what happens is when I come to this view, straightaway the number 0 is shown as opposed to ideally displaying all numbers in the sequence 9,8,7,6,5,4,3,2,1,0
What am I doing wrong here..?
Swift 4:
var totalTime = 10
var countdownTimer: Timer!
#IBOutlet weak var timeLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
startTimer()
}
This method call initializes the timer. It specifies the timeInterval (how often the a method will be called) and the selector (the method being called).
The interval is measured seconds so for it to perform like a standard clock we should set this argument to 1.
func startTimer() {
countdownTimer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(updateTime), userInfo: nil, repeats: true)
}
// Stops the timer from ever firing again and requests its removal from its run loop.
func endTimer() {
countdownTimer.invalidate()
}
//updateTimer is the name of the method that will be called at each second. This method will update the label
#objc func updateTime() {
timeLabel.text = "\(totalTime)"
if totalTime != 0 {
totalTime -= 1
} else {
endTimer()
}
}
I'm new to iOS app development and I'm trying to change the screen brightness but it happens pretty abruptly. Is there a way to animate the screen brightness smoothly?
Instead of a timer, a Swift extension:
extension UIScreen {
private static let step: CGFloat = 0.1
static func animateBrightness(to value: CGFloat) {
guard fabs(UIScreen.main.brightness - value) > step else { return }
let delta = UIScreen.main.brightness > value ? -step : step
DispatchQueue.main.asyncAfter(deadline: .now() + 0.01) {
UIScreen.main.brightness += delta
animateBrightness(to: value)
}
}
}
I guess you can set a re-occurring timer like so:
var timer = Timer.scheduledTimer(timeInterval: 0.05, target: self, selector: #selector(self.update), userInfo: nil, repeats: true)
And add the update method:
func update() {
UIScreen.main.brightness = UIScreen.main.brightness - CGFloat(0.1)
if UIScreen.main.brightness == CGFloat(0.5) { // or any brightness you want.
timer.invalidate()
}
}
Just play around with the timer interval and the brightness decreasing until you find what you are looking for.
I am trying to set up a custom gesture over an Image in Xcode (Swift).
The gesture is about rubbing the image or tickling it continuously and accordingly firing my function in time interval while the finger is moving.
I would appreciate some help here.
thanks a lot.
//That's my idea, not tested
var time = 0.0
var timeInterval = 1.0
var everyTime = 0.1
func addPan() {
let imageView = UIImageView()
//imageView.frame = xxxx
let pan = UIPanGestureRecognizer(target: self, action: #selector(panGesture(gesture:)))
imageView.isUserInteractionEnabled = true
imageView.addGestureRecognizer(pan)
}
func panGesture(gesture : UIPanGestureRecognizer) {
if gesture.state == .changed, time >= timeInterval {
print("time interval is \(everyTime) every is \(everyTime)")
}
}
func addtimer() {
let timer = Timer.scheduledTimer(timeInterval: timeInterval, target: self, selector: #selector(timerAction), userInfo: nil, repeats: true)
RunLoop.current.add(timer, forMode: RunLoopMode.commonModes)
}
func timerAction() {
time += timeInterval
if time >= timeInterval {
time = 0.0
}
}
I want to move a UISlider from minValue to maxValue in a loop when you hit a button and stop it at the current position when hitting the button again, I want to use Swift.
The main problem i got is that the function slider.setValue() is way to fast, I want the animation more slowly.
#IBAction func setSliderValue(_ sender: UIButton){
slider.setValue(100, animated: true)
print("The value of the slider is now \(slider.value)")
sliderValue = Int(slider.value)
}
You can use time to Automatically Move slider.
Create NSTimer variable in global scope:
Also create one Bool variable in global scope for checking if Need to revise it.
var mytimer : NSTimer?
var reversing : Bool?
start timer when you want to animate it:
reversing = NO;
mytimer = NSTimer.scheduledTimerWithTimeInterval(0.1, target: self, selector: #selector(timerAction), userInfo: nil, repeats: true)
On tImer Action, You can write code to change value of Slider:
var sliderrange = slider.maxValue - slider.minValue;
var increment = sliderrange/100;
var newval = slider.value;
newel = reversing ? (slider.value - increment) : (slider.value + increment);
if(newval >= slider.maxValue)
{
reversing = true;
newval = newval - 2*increment;
}
else if(newel <= 0)
{
reversing = false;
}
slider.setValue(newval, animated: true)
On Button Action, You can just stop the timer,
if mytimer != nil {
mytimer!.invalidate()
mytimer = nil
}
This code is working, though the slider only moves from left to right, not from right to left when he reached maximumValue, it should move from left to right and then right to left until the invalidated.
#IBAction func setSliderValue(_ sender: UIButton){
mytimer = Timer.scheduledTimer(timeInterval: 0.1, target: self, selector: #selector(timerAction), userInfo: nil, repeats: true)
/*slider.setValue(100, animated: true)
print("The value of the slider is now \(slider.value)")
sliderValue = Int(slider.value)*/
}
func timerAction(){
let Range = slider.maximumValue - slider.minimumValue;
let Increment = Range/100;
let newval = slider.value + Increment;
if(Increment <= slider.maximumValue)
{
slider.setValue(newval, animated: true)
print("The value of the slider is now \(slider.value)")
sliderValue = Int(slider.value)
}
else if (Increment >= slider.minimumValue)
{
slider.setValue(newval, animated: true)
}
}
I want to add a score to the top of my scene in the game I am working on. The score is going to based on how long you last, and will increase every second. Thanks for the help in advance!
import SpriteKit
class easyScene: SKScene {
let scrollBarEasyBottom = SKSpriteNode(imageNamed: "scrollBarEasyBottom")
let scrollBarEasyTop = SKSpriteNode(imageNamed: "scrollBarEasyTop")
let ball = SKSpriteNode(imageNamed: "ball")
var origSBEBpositionX = CGFloat(0)
var origSBETpositionX = CGFloat(0)
var maxSBEBX = CGFloat(0)
var SBEBSpeed = 5
var maxSBETX = CGFloat(0)
var SBETSpeed = 5
var score = 0
var timer: NSTimer?
var scoreText = SKLabelNode(fontNamed: "Kailasa")
override func didMoveToView(view: SKView) {
println("Easy Scene is the location")
self.backgroundColor = UIColor.blackColor()
self.scrollBarEasyBottom.position = CGPoint(x:0, y:270)
self.addChild(self.scrollBarEasyBottom)
self.scrollBarEasyBottom.yScale = 0.2
self.origSBEBpositionX = self.scrollBarEasyBottom.position.x
// end scrollBarEasyBottom
self.scrollBarEasyTop.position = CGPoint(x:20, y:400)
self.addChild(self.scrollBarEasyTop)
self.scrollBarEasyTop.yScale = 0.2
self.origSBETpositionX = self.scrollBarEasyTop.position.x
// end scrollBarEasyTop
self.ball.position = CGPoint(x:40, y:293)
self.addChild(self.ball)
self.ball.yScale = 0.17
self.ball.xScale = 0.17
// end ball
self.maxSBEBX = self.scrollBarEasyBottom.size.width - self.frame.size.width
self.maxSBEBX *= -1
self.maxSBETX = self.scrollBarEasyTop.size.width - self.frame.size.width
self.maxSBETX *= -1
//
self.scoreText.text = "0"
self.scoreText.fontSize = 60
self.scoreText.position = CGPoint(x: CGRectGetMidX(self.frame), y: 500)
self.scoreText.text = String(self.score)
self.addChild(self.scoreText)
timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("scoreIncrease") , userInfo: nil, repeats: true)
func scoreIncrease (){
score++
println(score)
}
}
override func update(currentTime: NSTimeInterval) {
if self.scrollBarEasyBottom.position.x <= maxSBEBX + 1200 {
self.scrollBarEasyBottom.position.x = self.origSBEBpositionX
}
if self.scrollBarEasyTop.position.x <= maxSBETX + 1200 {
self.scrollBarEasyTop.position.x = self.origSBETpositionX
}
scrollBarEasyBottom.position.x -= CGFloat(self.SBEBSpeed)
scrollBarEasyTop.position.x -= CGFloat(self.SBETSpeed)
// moving bars
var degreeRotation = CDouble(self.SBEBSpeed) * M_PI / 180
self.ball.zRotation -= CGFloat(degreeRotation)
//rotate ball
}
}
After running this code, I always get an
unrecognized selector sent to instance error
You can use one like this:
var timer = NSTimer()
override func viewDidLoad() {
scheduledTimerWithTimeInterval()
}
func scheduledTimerWithTimeInterval(){
// Scheduling timer to Call the function "updateCounting" with the interval of 1 seconds
timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("updateCounting"), userInfo: nil, repeats: true)
}
func updateCounting(){
NSLog("counting..")
}
Swift 3:
var timer = Timer()
override func viewDidLoad() { // Use for the app's interface
scheduledTimerWithTimeInterval()
}
override func didMove(to view: SKView) { // As part of a game
scheduledTimerWithTimeInterval()
}
func scheduledTimerWithTimeInterval(){
// Scheduling timer to Call the function "updateCounting" with the interval of 1 seconds
timer = Timer.scheduledTimer(timeInterval: 1, target: self, selector: #selector(self.updateCounting), userInfo: nil, repeats: true)
}
#objc func updateCounting(){
NSLog("counting..")
}
Swift 5:
Note: this solution is compatible with iOS 10.0+.
// If needing to check for iOS compatibility use
// if #available(iOS 10.0, *) {code}
var timer = Timer()
override func viewDidLoad() {
self.timer = Timer.scheduledTimer(withTimeInterval: 1, repeats: true, block: { _ in
updateCounting()
})
}
func updateCounting(){
print("counting...")
}
You can then invalidate (stop) the timer using:
timer.invalidate()
There is something called NSTimer in swift which could solve your problem. I have given an example like how you can use it. Just customise it for your purpose.
var timer = NSTimer.scheduledTimerWithTimeInterval(1.0,
target: self,
selector: Selector("yourMethodToCall"),
userInfo: nil,
repeats: true)
Add this line to the place where you need to call your function repeatedly.
The 1.0 refers to 1 second.
Change the selector to call yourMethodName
repeats is set to true to call that function every second.
Try this out and let me know if your are stuck somewhere. Thanks.
Swift 3
find this solution it worked for me
weak var timer: Timer?
var timerDispatchSourceTimer : DispatchSourceTimer?
func startTimer() {
if #available(iOS 10.0, *) {
timer = Timer.scheduledTimer(withTimeInterval: 3, repeats: true) { [weak self] _ in
// do something here
}
} else {
// Fallback on earlier versions
timerDispatchSourceTimer = DispatchSource.makeTimerSource(flags: [], queue: DispatchQueue.main)
timerDispatchSourceTimer?.scheduleRepeating(deadline: .now(), interval: .seconds(60))
timerDispatchSourceTimer?.setEventHandler{
// do something here
}
timerDispatchSourceTimer?.resume()
}
}
func stopTimer() {
timer?.invalidate()
//timerDispatchSourceTimer?.suspend() // if you want to suspend timer
timerDispatchSourceTimer?.cancel()
}
// if appropriate, make sure to stop your timer in `deinit`
deinit {
stopTimer()
}
I prefer
var timer: Timer?
override func viewDidLoad() {
super.viewDidLoad()
timer = Timer.scheduledTimer(withTimeInterval: 1.0, repeats: true) { (timer) in
// Do what you need to do repeatedly
}
}
To stop it:
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
if timer != nil {
timer?.invalidate()
timer = nil
}
}
Xcode 10.2 Swift 5:
override func viewDidLoad() {
super.viewDidLoad()
// ...
Timer.scheduledTimer(timeInterval: 8.0, target: self, selector: Selector(("your #obcj func name")), userInfo: nil, repeats: true)
}
//Anywhere in the same view controller to stop the loop:
Timer.cancelPreviousPerformRequests(withTarget: your #obcj func name())
I don't think you need NSTimer for this.
Since you are using SpriteKit, I am going to suggest simplest solution in my opinion:
Declare a variable var prevScoreCalcTime:TimeInterval = 0
Inside of update func in your GameScene set it up like below:
override func update(_ currentTime: TimeInterval) {
if currentTime - prevScoreCalcTime > 1 {
prevScoreCalcTime = currentTime
// Any function you put here will execute every second
}
}
Good luck!
// For running a piece of code every second
///Runs every second, to cancel use: timer.invalidate()
#discardableResult public static func runThisEvery(
seconds: TimeInterval,
startAfterSeconds: TimeInterval,
handler: #escaping (CFRunLoopTimer?) -> Void) -> Timer {
let fireDate = startAfterSeconds + CFAbsoluteTimeGetCurrent()
let timer = CFRunLoopTimerCreateWithHandler(kCFAllocatorDefault, fireDate, seconds, 0, 0, handler)
CFRunLoopAddTimer(CFRunLoopGetCurrent(), timer, CFRunLoopMode.commonModes)
return timer!
}