不返回数组但数组存在？

Question

我只是想检测是否已使用我的库成功将数据解析到主ViewController中。如何从库文件功能中检索数据？这里的想法是检索所有数据，使用数据中的URL通过我的第二个函数进行解析，该函数接收字符串并将图像存储在缓存中，然后将其加载回视图控制器中

1

______________________________________________________（不同文件）

class Library {


    func parseData() -> [Pintrest] {

        let jsonUrlString = "MyLink"
        guard let url = URL(string: jsonUrlString) else { return pintrest }
        let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
            guard let data = data else { return  }
            do {
                if let pintrests = try? JSONDecoder().decode([Pintrest].self, from: data){
                    pintrest = pintrests
                   DispatchQueue.main.async {
                    print(pintrest) // THIS PRINTS THE DATA
                   }
                }
            }
        }
        task.resume()
        return pintrest
    }

func parseImages(ImagesUrlArrayPath: String){
        if let imageURL = URL(string: (ImagesUrlArrayPath)){
            DispatchQueue.global().async{
                let data = try? Data(contentsOf: imageURL)
                if let data = data{
                    let imageToCache = UIImage(data: data)
//                    let image = imageToCache
                    DispatchQueue.main.async {
                        imageCache.setObject(imageToCache!, forKey: ImagesUrlArrayPath as AnyObject)
                        print("success")
                        //cell?.videoImageView.image = image //?.resizeImage(targetSize: size)

                    }
                }
            }
        }

    }
 }