Alamofire.request vs. manager.request - 经理不工作

Question

编辑:问题不是关于什么-999的意思,但为什么我没有得到第一个代码片段的错误,但第二个？除了在第二个代码片段中使用Alamofire.Manager(它应该与第一个代码片段中的Alamofire.request相同),一切都是相同的.这是一个错误,还是我错过了什么？

我有一个与Alamofire.request合作的功能......

func getMenuFromIsoShortDate(menuDate: String) {
    let user = Constants.DummyCredentials.UserName
    let password = Constants.DummyCredentials.PassWord

    var urlString = ""
    let dateForWebservice: NSDate? = NSDate.dateFromIsoString(menuDate)

    if let dateForWebservice = dateForWebservice {
        urlString = Constants.WebservicePath.DailyMenu + NSDate.dateToIsoSlash(dateForWebservice)
        println("urlString: \(urlString)")
    }
    let credential = NSURLCredential(user: user, password: password, persistence: .ForSession)

    Alamofire.request(.GET, urlString)
    .authenticate(usingCredential: credential)
    .response {
        (request, response, data, error) in

        if let response = response {
            var statusCode = response.statusCode
            println("-->statusCode: \(statusCode)")
        }

        if (error == nil) {
            var serializationError: NSError?
            let jsonData: AnyObject? = NSJSONSerialization.JSONObjectWithData(data! as! NSData, options: NSJSONReadingOptions.AllowFragments, error: &serializationError)

            var parser: Parser = Parser()
            let menu: Menu = parser.parseMenuJSON(jsonData)

            var dataAccess: DataAccess = DataAccess.sharedInstance
            dataAccess.addMenu(menu)
        } else {
            println("Webservice error: \(error)")
        }
    }
}

但是当我使用manager.request运行代码时 - 它会运行,但会给我一个-999错误.这里改变了代码:

func getMenuFromIsoShortDate(menuDate: String) {
    let user = Constants.DummyCredentials.UserName
    let password = Constants.DummyCredentials.PassWord

    var urlString = ""
    let dateForWebservice: NSDate? = NSDate.dateFromIsoString(menuDate)

    if let dateForWebservice = dateForWebservice {
        urlString = Constants.WebservicePath.DailyMenu + NSDate.dateToIsoSlash(dateForWebservice)
        println("urlString: \(urlString)")
    }
    let credential = NSURLCredential(user: user, password: password, persistence: .ForSession)

    let configuration = NSURLSessionConfiguration.defaultSessionConfiguration()
    manager = Alamofire.Manager(configuration: configuration)

    manager.request(.GET, urlString)
    .authenticate(usingCredential: credential)
    .response {
        (request, response, data, error) in

        if let response = response {
            var statusCode = response.statusCode
            println("-->statusCode: \(statusCode)")
        }

        if (error == nil) {
            var serializationError: NSError?
            let jsonData: AnyObject? = NSJSONSerialization.JSONObjectWithData(data! as! NSData, options: NSJSONReadingOptions.AllowFragments, error: &serializationError)

            var parser: Parser = Parser()
            let menu: Menu = parser.parseMenuJSON(jsonData)

            var dataAccess: DataAccess = DataAccess.sharedInstance
            dataAccess.addMenu(menu)
        } else {
            println("Webservice error: \(error)")
        }
    }
}

这里的错误信息:

Webservice error: Optional(Error Domain=NSURLErrorDomain Code=-999 "Abgebrochen" UserInfo=0x7f8f11c3f210 {NSErrorFailingURLKey=http://test.myserver.de:18507/app/services/mampf/get-menu/2015/05/08, NSLocalizedDescription=Abgebrochen, NSErrorFailingURLStringKey=http://test.myserver.de:18507/app/services/mampf/get-menu/2015/05/08})

这有什么问题？

Answer 1

我可以看到两个可能的问题.

问题1 - 经理被取消分配

第一个明显的问题是您是否将自定义manager实例保留在内存中.您需要在属性中保留管理器,以确保它不会在请求中间取消分配.

问题2 - 缺少默认HTTP标头

Alamofire.request和您之间的唯一区别manager.request是您manager缺少默认情况下Alamofire共享管理器附加的默认标头.

public static let sharedInstance: Manager = {
    let configuration: NSURLSessionConfiguration = NSURLSessionConfiguration.defaultSessionConfiguration()
    configuration.HTTPAdditionalHeaders = Manager.defaultHTTPHeaders

    return Manager(configuration: configuration)
}()

我会在管理器初始化中添加以下行,看看是否能使行为保持一致.

let configuration = NSURLSessionConfiguration.defaultSessionConfiguration()
configuration.HTTPAdditionalHeaders = Alamofire.Manager.defaultHTTPHeaders
manager = Alamofire.Manager(configuration: configuration)

希望这可以帮助您解决问题的根源.我不清楚为什么缺少默认标题会导致您看到的问题,但如果无法访问您的项目,则很难进一步挖掘.