swift: repeat animation after time

Question

I have this animation:

override func viewDidLoad() {
        super.viewDidLoad()
_ = Timer.scheduledTimer(timeInterval: 15, target: self, selector: #selector(self.callingFunction), userInfo: nil, repeats: true)
}

@objc func callingFunction(){
        let image0:UIImage = UIImage(named: "next0.png")!
        let image1:UIImage = UIImage(named: "next1.png")!
        let image2:UIImage = UIImage(named: "next2.png")!
        let image3:UIImage = UIImage(named: "next3.png")!
        let image4:UIImage = UIImage(named: "next4.png")!
        let image5:UIImage = UIImage(named: "next5.png")!
        let image6:UIImage = UIImage(named: "next6.png")!
        let image7:UIImage = UIImage(named: "next7.png")!

        nextButton.setImage(image0, for: .normal)
        nextButton.imageView!.animationImages = [image0, image1, image2, image3, image4, image5, image6, image7]
        nextButton.imageView!.animationDuration = 1.0
        nextButton.imageView!.startAnimating()
    }

I need to repeat this animation in every 15 seconds. But this animation starts after 15 seconds and next execute every 1 second.

@PiyushRathi I want to repeat animation in every 15 seconds. — user, Aug 09 '18 at 05:27
@PiyushRathi In this case my animation execute every 1 second. And stops after 15 seconds. — user, Aug 09 '18 at 05:52
You mean to say when you call timer it starts after 15 sec, but images shuffle in 1.0 sec? — PiyushRathi, Aug 09 '18 at 06:18
you should read the repeat count behaviors if you are using from viewDidLodad https://stackoverflow.com/questions/29621400/uiimageview-animationrepeatcount-strange-behaviour — Iraniya Naynesh, Aug 09 '18 at 06:18
So you need to increase/decrease value of 'animationDuration' — PiyushRathi, Aug 09 '18 at 06:22
@PiyushRathi I need that every 15 seconds my animation with duration 1 second execute. For example. 15 seconds not animation -> animation start with duration 1 second -> 15 seconds not animation -> animation start with duration 1 second -> 15 seconds not animation -> animation start with duration 1 second ... — user, Aug 09 '18 at 06:23
@PiyushRathi I need an animation with a duration of 1 second to be executed every 15 seconds. — user, Aug 09 '18 at 06:24
Got you, just you need to set animationRepeatCount = 1 (this will help image change will stop in one), and when timer reach to 15sec then again call your callingFunction.. — PiyushRathi, Aug 09 '18 at 06:26

Pranavan SP · Answer 1 · 2018-08-09T06:33:50.560

1

You have to call function by using timer. Set timeInterval to 15 seconds.

callingFunction()
timer = Timer.scheduledTimer(timeInterval: 15, target: self, selector: #selector(self.callingFunction), userInfo: nil, repeats: true)

func callingFunction(){
      //Execute your code
      let image0:UIImage = UIImage(named: "next0.png")!
let image1:UIImage = UIImage(named: "next1.png")!
let image2:UIImage = UIImage(named: "next2.png")!
let image3:UIImage = UIImage(named: "next3.png")!
let image4:UIImage = UIImage(named: "next4.png")!
let image5:UIImage = UIImage(named: "next5.png")!
let image6:UIImage = UIImage(named: "next6.png")!
let image7:UIImage = UIImage(named: "next7.png")!

nextButton.setImage(image0, for: .normal)
nextButton.imageView!.animationImages = [image0, image1, image2, image3, image4, image5, image6, image7]
nextButton.imageView!.animationDuration = 1.0
nextButton.imageView!.animationRepeatCount = 1
nextButton.imageView!.startAnimating()
}

edited Aug 09 '18 at 06:33

answered Aug 09 '18 at 05:10

Pranavan SP

1,785
1
17
33

Sorry. I need repeat animation in every 15 second – user Aug 09 '18 at 05:20
@user yes. you can achieve by this – Pranavan SP Aug 09 '18 at 05:22
In your code after 15 second create loop and repeat animation after 0 second. – user Aug 09 '18 at 05:23
@user can you clearly state here what you expected to do. i could not get you – Pranavan SP Aug 09 '18 at 05:24
I want to repeat animation in every 15 seconds. In you code animation repeat after 15 seconds one time and next repeat after 0 second (loop). – user Aug 09 '18 at 05:27
@user you can do it by calling it then set timer. Check my edited answer – Pranavan SP Aug 09 '18 at 05:28
Same result. First time animation call after 15 seconds. Second time animation call immediately. And next animations calls immediately. – user Aug 09 '18 at 05:32
Let us [continue this discussion in chat](https://chat.stackoverflow.com/rooms/177695/discussion-between-pranavan-sp-and-user). – Pranavan SP Aug 09 '18 at 05:33
@user try to add nextButton.imageView!.animationRepeatCount = 1. edited answer – Pranavan SP Aug 09 '18 at 06:34

PiyushRathi · Accepted Answer · 2018-08-09T09:29:23.080

Just Updating your code

Just you need to set animationRepeatCount = 1 (this will help image change will stop in one), and when a timer reaches to 15sec then again call your callingFunction.

override func viewDidLoad() {
    super.viewDidLoad()
    /// You need to take class object here for timer, when viewWillDisapper called you need to invalidate timer other wise you will fase memory issues
    self.timer = Timer.scheduledTimer(timeInterval: 15, target: self, selector: #selector(self.timerTimeUp), userInfo: nil, repeats: true)
}

@objc func timerTimeUp() {
    self.callingFunction()
}

func callingFunction(){
    let image0:UIImage = UIImage(named: "next0.png")!
    let image1:UIImage = UIImage(named: "next1.png")!
    let image2:UIImage = UIImage(named: "next2.png")!
    let image3:UIImage = UIImage(named: "next3.png")!
    let image4:UIImage = UIImage(named: "next4.png")!
    let image5:UIImage = UIImage(named: "next5.png")!
    let image6:UIImage = UIImage(named: "next6.png")!
    let image7:UIImage = UIImage(named: "next7.png")!

    nextButton.setImage(image0, for: .normal)
    nextButton.imageView!.animationImages = [image0, image1, image2, image3, image4, image5, image6, image7]
    nextButton.imageView!.animationDuration = 1.0
    nextButton.imageView!.animationRepeatCount = 1
    nextButton.imageView!.startAnimating()
}

Updated Code

override func viewWillDisappear(_ animated: Bool) {
    super.viewWillDisappear(animated)
    self.invalidateTimer()
}

func invalidateTimer() {
   if self.timer != nil {
      self.timer.invalidate()
      self.timer = nil
   }
}

You can call invalidateTimer() method, whenever view dismiss/Disappear.

Hope this will help you.

@piyushRathi why timerTimeUp() function here. Even you didn't call — Pranavan SP, Aug 09 '18 at 07:01
@PranavanSp I just copied paste code, I forgot to change it. Now updated. — PiyushRathi, Aug 09 '18 at 07:17
@PiyushRathi Thank you! But could I add code for remove timer in `viewWillDisapper ` in answer. Please? — user, Aug 09 '18 at 08:02

score 0 · Answer 3 · answered Aug 09 '18 at 05:10

0

You can use a timer:

let timer = Timer.scheduledTimer(withTimeInterval: 15, repeats: true) {
     [weak self] (timer) in
     self?.nextButton.imageView?.startAnimating()
}

To stop it:

timer.invalidate()

answered Aug 09 '18 at 05:10

ukim

2,395
15
22

Sorry I need repeat animation in every 15 second – user Aug 09 '18 at 05:20
see the `repeats: true` param @user – ukim Aug 09 '18 at 05:21
your code after 15 second create loop animation with delay 0. – user Aug 09 '18 at 05:22
I want to repeat animation in every 15 seconds. In you code animation repeat after 15 seconds one time and next repeat after 0 second (loop). – user Aug 09 '18 at 05:27

swift: repeat animation after time

3 Answers3