我需要API响应缓存更长的时间。因此，我试图修改API响应的“max-age”头。
但是
urlSession(_ session: URLSession,
dataTask: URLSessionDataTask,
willCacheResponse proposedResponse: CachedURLResponse,
completionHandler: @escaping (CachedURLResponse?
) -> Void)方法不会被调用来执行此操作。
API客户端类代码：
public class APIClient: NSObject, URLSessionDelegate {
var endPoint: String!
var urlSession: URLSession!
public init(urlSession: URLSession = .shared) {
super.init()
self.endPoint = endPoint
let sessionConfiguration: URLSessionConfiguration = URLSessionConfiguration.default
sessionConfiguration.requestCachePolicy = .returnCacheDataElseLoad
sessionConfiguration.urlCache = .shared
self.urlSession = URLSession(configuration: sessionConfiguration, delegate: self, delegateQueue: nil)
}
func urlSession(_ session: URLSession, dataTask: URLSessionDataTask, willCacheResponse proposedResponse: CachedURLResponse, completionHandler: @escaping (CachedURLResponse?) -> Void) {
if dataTask.currentRequest?.cachePolicy == .useProtocolCachePolicy {
let newResponse = proposedResponse.response(withExpirationDuration: 60)
completionHandler(newResponse)
}else {
completionHandler(proposedResponse)
}
}
private func dispatch<ReturnType: Decodable>(request: URLRequest) -> AnyPublisher<ReturnType, NetworkError> {
let url = request.url // For troubleshooting only
return urlSession
.dataTaskPublisher(for: request)
// Map on Request response
.tryMap({ data, response in
return data
})
.decode(type: ReturnType.self, decoder: JSONDecoder())
.mapError { error in
}
.eraseToAnyPublisher()
}
}API调用：
func makeAPICall() -> AnyPublisher<ContentConfigResponseModel, NetworkError> {
var request = // create request data
let apiClient = APIClient(endPoint: request.path)
return apiClient.dispatch(request)
}我已经尝试了多个cachePolicy。根据一些建议，我已经尝试实现
func urlSession(_ session: URLSession, dataTask: URLSessionDataTask, didReceive response: URLResponse) async -> URLSession.ResponseDisposition {
return URLSession.ResponseDisposition.allow
}
1条答案
按热度按时间bxjv4tth1#
不调用委托方法通常有三个原因：
delegate是nil：已dealloc或未设置（根本未设置，或未在正确示例上设置）你的问题是最后一个。
urlSession(_:dataTask:willCacheResponse:completionHandler:)是一个URLSessionDataDelegate方法。它是
URLSessionDelegate的“子协议”。APIClient只符合URLSessionDelegate，而不是URLSessionDataDelegate，即使它实现了具有相同签名的方法。所以
public class APIClient: NSObject, URLSessionDelegate应该是public class APIClient: NSObject, URLSessionDelegate, URLSessionDataDelegate我们也可以查看
URLSession源代码，指出它：你没有通过测试
if let delegate = task.session.delegate as? URLSessionDataDelegate。