我正在为 WatchOS 构建一个应用程序扩展,我想在 Watch 应用程序中执行一些 URL 请求。我在网络部分使用 Alamofire。
每当我做一个简单的请求时,我在模拟器和真实设备上都会收到这些错误:
加载失败,错误 Error Domain=NSURLErrorDomain Code=-2000 “无法从网络加载”
我不清楚为什么会这样。 watch 与手机配对。 使用 Charles Proxy 我可以看到请求没有通过网络发送,所以它甚至在发送之前就失败了。
欢迎提出任何想法。
编辑 这是我的通信类的工作摘录:
import Foundation
import Alamofire
class Communication {
internal lazy var manager = Communication.getSessionManager()
typealias SuccesBlock = (DataResponse<Any>?) -> ()
typealias FailureBlock = (DataResponse<Any>?, Error) -> ()
typealias ProgressBlock = (Progress) -> ()
internal static var serverTrustPolicyManager: ServerTrustPolicyManager {
get {
return ServerTrustPolicyManager(policies: [:])
}
}
static func getSessionManager(_ serializeRequest:Bool = false) -> Alamofire.SessionManager {
let manager = Alamofire.SessionManager(configuration: URLSessionConfiguration.default, delegate: Alamofire.SessionManager.default.delegate, serverTrustPolicyManager: serverTrustPolicyManager)
return manager
}
static var httpHeaders: HTTPHeaders {
get {
var httpHeaders = HTTPHeaders()
httpHeaders["Accept"] = "application/json"
return httpHeaders
}
}
func get(_ url: URL, parameters: [String: Any]?, success: @escaping SuccesBlock, failure: @escaping FailureBlock) {
manager.request(url, method: HTTPMethod.get, parameters: parameters, encoding: URLEncoding.default, headers: Communication.httpHeaders).validate().responseJSON { [weak self] (response) in
self?.handle(response, success: success, failure: failure)
}
}
internal func handle(_ response: DataResponse<Any>, success: @escaping SuccesBlock, failure: @escaping FailureBlock) {
switch response.result {
case .success:
DispatchQueue.main.async {
success(response)
}
case .failure(let error):
DispatchQueue.main.async {
failure(response, error)
}
}
}
}
我发送到 get(_ url: URL, parameters: [String: Any]?, success: @escaping SuccesBlock, failure: @escaping FailureBlock)
函数的任何内容都给出了 -2000 错误. .responseJSON
代码块永远不会执行。
编辑 2
我得到的完整错误如下:
`2018-09-20 12:12:48.006544+0100 My App Watch Extension[61347:2465172] Task <F80A9AD4-519B-424C-868A-8E239C949016>.<7> load failed with error Error Domain=NSURLErrorDomain Code=-2000 "can’t load from network" UserInfo={NSLocalizedDescription=can’t load from network, _NSURLErrorFailingURLSessionTaskErrorKey=LocalDataTask <F80A9AD4-519B-424C-868A-8E239C949016>.<7>, _NSURLErrorRelatedURLSessionTaskErrorKey=(
"LocalDataTask <F80A9AD4-519B-424C-868A-8E239C949016>.<7>"
), NSErrorFailingURLStringKey=https://my.request.url, _kCFNetworkErrorConditionalRequestKey=<CFMutableURLRequest 0x78f37a70 [0x201628c]> {url = https://my.request.url, cs = 0x0}, _kCFNetworkErrorCachedResponseKey=<CFCachedURLResponse 0x7b3d7f20 [0x201628c]>, NSUnderlyingError=0x7b436380 {Error Domain=kCFErrorDomainCFNetwork Code=-2000 "(null)" UserInfo={_kCFNetworkErrorCachedResponseKey=<CFCachedURLResponse 0x7b3d7f20 [0x201628c]>, _kCFNetworkErrorConditionalRequestKey=<CFMutableURLRequest 0x78f37a70 [0x201628c]> {url = https://my.request.url, cs = 0x0}}}, NSErrorFailingURLKey=https://my.request.url} [-2000]`
在控制台中收到此错误后,我现在可以看到请求仍在发送并成功。看到此错误后,我以为情况并非如此,但我现在看到,经过一些延迟后,请求按预期工作。
所以最终该应用程序将运行,但是,剩下的问题是:为什么会出现此错误以及如何消除它?
最佳答案
错误描述为
NSURLErrorCannotLoadFromNetwork
This error is sent when the task needs to load from the network, but is blocked from doing so by the “load only from cache” directive.
你可以通过设置Alamofire请求的requestCachePolicy来解决,像这样:
class RequestManager {
let manager: SessionManager = {
let configuration = URLSessionConfiguration.default
configuration.requestCachePolicy = .reloadIgnoringLocalCacheData
return SessionManager(configuration: configuration)
}()
func fetch() {
manager.request("https://www.bla.blub")
...
关于swift - 在 WatchOS 上与 Alamofire 联网,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/52404748/