How to stop a Lottie animation manually - swift

Question

I use the Lottie animation library in XCode. But when I go to another page, the animation is running in the background. When I go back the main page, the animation is running twice and there is too much RAM being consumed. How can I fix this problem? and how can I stop the animation after a specific time?
import UIKit
import Lottie
class CoffeeSpecialFortunePageVC: UIViewController {
#IBAction func PopUpIn(_ sender: Any) {
animateIn(desiredView: PopupBlur)
animateIn(desiredView: popupView)
animation()
}
#IBAction func SuccesBtn(_ sender: UIView) {
animateOut(desiredView: PopupBlur)
animateOut(desiredView: popupView)
}
#IBOutlet var popupView: AnimationView!
#IBOutlet var PopupBlur: UIVisualEffectView!
override func viewDidLoad() {
super.viewDidLoad()
view.backgroundColor = UIColor.purple
PopupBlur.bounds = self.view.bounds
popupView.bounds = CGRect(x: 0, y: 0, width: self.view.bounds.width * 0.9, height: self.view.bounds.height * 0.4)
// Do any additional setup after loading the view.
}
func animation() {
popupView! = .init(name: "check1")
popupView?.frame = view.bounds
view.addSubview(popupView!)
popupView?.play()
popupView.contentMode = .scaleAspectFit
popupView.frame.size.height = 350
popupView.frame.size.width = 350
popupView.center.x = view.center.x
popupView.center.y = view.center.y
}
func animateIn(desiredView: UIView) {
let backgraundview = self.view!
backgraundview.addSubview(desiredView)
desiredView.transform = CGAffineTransform(scaleX: 1.2, y: 1.2)
desiredView.alpha = 0
desiredView.center = backgraundview.center
UIView.animate(withDuration: 0.3, animations:{
desiredView.transform = CGAffineTransform(scaleX: 1.0, y: 1.0)
desiredView.alpha = 1
})
}
func animateOut(desiredView: UIView) {
UIView.animate(withDuration: 0.3, animations: {
desiredView.transform = CGAffineTransform(scaleX: 1.2, y: 1.2)
desiredView.alpha = 0
},completion: {_ in
desiredView.removeFromSuperview()
})
}
}

Answer 1

You can use one of the play(fromProgress...) API's that Lottie provides
animationView.play(
fromProgress: animationView.currentProgress,
toProgress: 1,
loopMode: .playOnce,
completion: { [weak self] completed in
DispatchQueue.main.asyncAfter(deadline: .now() + 0.01) {
self.stopLoopAndTranstion(to: animation, endIn: image)
}
}
)
This will ensure that your current animation will finish and in completion block you can do your finishing work

Answer 2

One of the best solutions:
Create a notifier when the app goes to the background for pause and when back to the foreground
override func viewDidLoad()
{
super.viewDidLoad()
let notificationCenter = NotificationCenter.default
notificationCenter.addObserver(self, selector: #selector(appMovedToBackground), name: UIApplication.willResignActiveNotification, object: nil)
notificationCenter.addObserver(self, selector: #selector(appBecomeActive), name: UIApplication.didBecomeActiveNotification, object: nil)
animationView = .init(name: "lang")
animationView!.frame = CGRect(x: 20, y: 100, width: 50, height: 50)
animationView!.contentMode = .scaleAspectFit
animationView!.loopMode = .loop
animationView!.animationSpeed = 0.5
view.addSubview(animationView!)
animationView!.play()
}
This will invoke notification methods when the app moves to background and foreground
#objc func appMovedToBackground()
{
print("App moved to background!")
animationView!.removeFromSuperview()
}
#objc func appBecomeActive()
{
print("App become active")
//animationView!.play()
animationView = .init(name: "lang")
animationView!.frame = CGRect(x: 20, y: 100, width: 50, height: 50)
animationView!.contentMode = .scaleAspectFit
animationView!.loopMode = .loop
animationView!.animationSpeed = 0.5
view.addSubview(animationView!)
animationView!.play()
}
This will solve your problem....... For sure