Lottie Animation From URL

AnimationViewInitializers.swift

     /**
   Loads a Lottie animation asynchronously from the URL
   
   - Parameter url: The url to load the animation from.
   - Parameter imageProvider: An image provider for the animation's image data.
   If none is supplied Lottie will search in the main bundle for images.
   - Parameter closure: A closure to be called when the animation has loaded.
   */
  convenience init(url: URL,
                          imageProvider: AnimationImageProvider? = nil,
                          closure: @escaping AnimationView.DownloadClosure,
                          animationCache: AnimationCacheProvider? = LRUAnimationCache.sharedCache) {
    
    if let animationCache = animationCache, let animation = animationCache.animation(forKey: url.absoluteString) {
      self.init(animation: animation, imageProvider: imageProvider)
      closure(nil)
    } else {
      
      self.init(animation: nil, imageProvider: imageProvider)
      
      Animation.loadedFrom(url: url, closure: { (animation) in
        if let animation = animation {
          self.animation = animation
          closure(nil)
        } else {
          closure(LottieDownloadError.downloadFailed)
        }
      }, animationCache: animationCache)
    }
  }

Source: https://github.com/airbnb/lottie-ios/blob/fe9ccb33b5f3baf53bb56f11b75950367313201a/lottie-swift/src/Public/Animation/AnimationViewInitializers.swift#L66-L73