Lottie Cache Medium Post

AnimationPublic.swift

  //////////// AnimationPublic.swift
  static func loadedFrom(url: URL,
                                closure: @escaping Animation.DownloadClosure,
                                animationCache: AnimationCacheProvider?) {
    
    /// 1
    if let animationCache = animationCache, let animation = animationCache.animation(forKey: url.absoluteString) {
      closure(animation)
    } else {
      let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
        guard error == nil, let jsonData = data else {
          DispatchQueue.main.async {
            closure(nil)
          }
          return
        }
        do {
          let animation = try JSONDecoder().decode(Animation.self, from: jsonData)
          DispatchQueue.main.async {
          /// 2
            animationCache?.setAnimation(animation, forKey: url.absoluteString)
            closure(animation)
          }
        } catch {
          DispatchQueue.main.async {
            closure(nil)
          }
        }
        
      }
      task.resume()
    }
  }