关闭的问题

大家好，代码如下

    struct NetworkImageManager {
    func fetchCurrentImage(completionHandler: @escaping (CurrrenImage)-> Void) {
        let urlString = "https://pixabay.com/api/?key=\(key)&q&image_type=photo"
        guard let url = URL(string: urlString) else {return}
        let urlSession = URLSession(configuration: .default)
        let task = urlSession.dataTask(with: url) { data, responce, error in
            if let data = data {
                if let currentImage = self.parseJSON(withData: data){
                    completionHandler(currentImage)
                }
            }

        }
        task.resume()
    }

    func parseJSON(withData data: Data) -> CurrrenImage? {
        let decoder = JSONDecoder()
        do {
            let currentImageData = try decoder.decode(CurrentImageData.self, from: data)
            guard let currentImage = CurrrenImage(currentImageData: currentImageData) else {return nil
            }
            return currentImage
        } catch let error as NSError {
            print(error)
        }
        return nil

    }

}

尝试将数据从一个视图传输到另一个视图时，会产生以下错误（该错误在 // 之后描述）

class CollectionViewController: UICollectionViewController {



let itemsPerRow: CGFloat = 2
let sectionInserts = UIEdgeInsets(top: 20, left: 20, bottom: 20, right: 20)

let networkImageManager = NetworkImageManager()


override func viewDidLoad() {
    super.viewDidLoad()
    networkImageManager.fetchCurrentImage(completionHandler: CurrrenImage) // Cannot convert value of type 'CurrrenImage.Type' to expected argument type '(CurrrenImage) -> Void'
}