在静态方法swift中设置委托

protocol NetworkManagerDelegate: AnyObject {
    func didReceiveData(_ data: Data)
    func didFailWithError(_ error: Error)
}

class NetworkManager {
    static weak var delegate: NetworkManagerDelegate?

    static func fetchData(from url: URL) {
        let task = URLSession.shared.dataTask(with: url) { data, response, error in
            if let error = error {
                self.delegate?.didFailWithError(error)
                return
            }
            
            if let data = data {
                self.delegate?.didReceiveData(data)
            }
        }
        task.resume()
    }
}

// 使用示例
class ViewController: UIViewController, NetworkManagerDelegate {
    override func viewDidLoad() {
        super.viewDidLoad()
        NetworkManager.delegate = self
        NetworkManager.fetchData(from: URL(string: "https://api.example.com/data")!)
    }

    func didReceiveData(_ data: Data) {
        // 处理接收到的数据
    }

    func didFailWithError(_ error: Error) {
        // 处理错误
    }
}

DispatchQueue.main.async {
    // 更新UI的操作
}