ios - 无法将类型 'RequestRetrier?' 的值分配给类型 'RequestRetrier?'

Question

我正在尝试像 Alamofire 页面中的示例一样重试请求，但出现此错误:

请求重试代码如下:

public typealias RequestRetryCompletion = (_ shouldRetry: Bool, _ timeDelay: TimeInterval) -> Void

public protocol RequestRetrier {
func should(_ manager: SessionManager, retry request: Request, with error: Error, completion: @escaping RequestRetryCompletion)}

class RequestRetryHandler: RequestRetrier {
public func should(_ manager: SessionManager, retry request: Request, with error: Error, completion: @escaping RequestRetryCompletion) {
    if let response = request.task?.response as? HTTPURLResponse, response.statusCode == 503 {
        completion(true, 10.0) // retry after 1 second

    } else {
        completion(false, 0.0) // don't retry
    }
}}

这就是错误发生的地方:

let manager = Alamofire.SessionManager.default
manager.retrier = RequestRetryHandler() as? RequestRetrier

Answer 1

您不应该重新声明协议(protocol)或 RequestRetryCompletion。这已经在 Alamofire 中为您完成了。您只需执行以下操作:

import Alamofire
import Foundation

class RequestRetryHandler: RequestRetrier {
    func should(_ manager: SessionManager, retry request: Request, with error: Error, completion: @escaping RequestRetryCompletion) {
        if let response = request.task?.response as? HTTPURLResponse, response.statusCode == 503 {
            completion(true, 10.0) // retry after 1 second

        } else {
            completion(false, 0.0) // don't retry
        }
    }
}

let manager = Alamofire.SessionManager.default
manager.retrier = RequestRetryHandler()

祝你好运!