那些遇到过的问题

NSURLSession didCompleteWithError：如何确定它是什么任务？

Ang*_*gie 4 web-services ios nsurlsession swift

我有一个符合NSURLSession委托的类，用于下载数据，并且在完成一个以上调用后调用函数func URLSession（session：NSURLSession，task：NSURLSessionTask，didCompleteWithError error：NSError？），结果有一个问题在这里解析并处理以返回给正确的视图控制器。

我怎么知道从哪个会话或任务得到的结果，以便可以调用正确的视图控制器？

import Foundation


class Support{

// MARK - Properties
var ID: Int!
var SoftekID: String!
var Subject: String!
var LastUpdate: String!
var LastUpdatedBy: String!
var Priority: Int!
var Impact: Int!
var SupportType: String!
var Importance: Int!


// MARK: General
init() {
    self.ID = 0
    self.SoftekID = ""
    self.Subject = ""
    self.LastUpdate = ""
    self.LastUpdatedBy = ""
    self.Priority = 0
    self.Impact = 0
    self.SupportType = ""
    self.Importance = 0
}

func getSupportTickets(){
let sp = SuppportProvider()
    sp.getSupportTickets()
}
}

class SuppportProvider: NSObject, NSURLSessionDelegate,      NSURLSessionDataDelegate, NSURLSessionTaskDelegate{

// MARK: - Properties
var mData: NSMutableData?
var session: NSURLSession!

override init(){
    super.init()
    prepareConnection()
}

// MARK: - Methods
func prepareConnection(){

    session = NSURLSession(configuration: NSURLSessionConfiguration.defaultSessionConfiguration(), delegate: self, delegateQueue:nil)
}

func getSupportTickets(){
    var request = NSMutableURLRequest(URL: NSURL(string: "http://10.0.58.137/ISOWeb.UI/api/CSMobile/GetSupportTickets?PageNumber=0&PagingSize=10&TicketStatus=Priority")!,
        cachePolicy: NSURLRequestCachePolicy.UseProtocolCachePolicy,
        timeoutInterval: 20.0)

    let task =  session.dataTaskWithRequest(request)

    mData = NSMutableData()
    task.resume()
}

func getHelpInformation(){
    var request = NSMutableURLRequest(URL: NSURL(string: "http://10.0.58.137/ISOWeb.UI/api/CSMobile/GetHelpInformation")!,
        cachePolicy: NSURLRequestCachePolicy.UseProtocolCachePolicy,
        timeoutInterval: 20.0)

    let task = session.dataTaskWithRequest(request)

    mData = NSMutableData()
    task.resume()
}

func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, didReceiveResponse response: NSURLResponse, completionHandler: (NSURLSessionResponseDisposition) -> Void) {

    mData!.length = 0
    completionHandler(NSURLSessionResponseDisposition.Allow)
}

func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, didReceiveData data: NSData) {

    mData!.appendData(data)
}

func URLSession(session: NSURLSession, task: NSURLSessionTask, didCompleteWithError error: NSError?) {

    if error != nil{
        println("An error has occured completing the request")
    }else{

        //Result for method: getSupportTickets
        var value = NSString(bytes: mData!.mutableBytes, length: mData!.length, encoding: NSUTF8StringEncoding)

        var jError: NSError?

        if let JSONResult: Array<NSDictionary> = NSJSONSerialization.JSONObjectWithData(mData!, options: NSJSONReadingOptions.AllowFragments, error: &jError) as? Array<NSDictionary> {

            if JSONResult.count > 0 {

               var arr = Array<Support>()

                for dict in JSONResult{

                    let item = Support()

                    if (dict["ID"] as? Int != nil) {
                        item.ID = dict["ID"] as! Int
                    }else {
                        item.ID = 0
                    }

                    if (dict["SoftekID"] as? String != nil) {
                        item.SoftekID = dict["SoftekID"] as! String
                    }else {
                        item.SoftekID = ""
                    }

                    if (dict["Subject"] as? String != nil) {
                        item.Subject = dict["Subject"] as! String
                    }else {
                        item.Subject = ""
                    }

                    if (dict["LastUpdate"] as? String != nil) {
                          item.LastUpdate = dict["LastUpdate"] as! String
                    }else {
                        item.LastUpdate = ""
                    }

                    if (dict["LastUpdatedBy"] as? String != nil) {
                         item.LastUpdatedBy = dict["LastUpdatedBy"] as! String
                    }else {
                        item.LastUpdatedBy = ""
                    }

                    if (dict["Priority"] as? Int != nil) {
                         item.Priority = dict["Priority"] as! Int
                    }else {
                         item.Priority = 0
                    }

                    if (dict["Impact"] as? Int != nil) {
                        item.Impact = dict["Impact"] as! Int
                    }else {
                        item.Impact = 0
                    }

                    if (dict["SupportType"] as? String != nil) {
                         item.SupportType = dict["SupportType"] as! String
                    }else {
                        item.SupportType = ""
                    }

                    if (dict["Importance"] as? Int != nil) {
                        item.Importance = dict["Importance"] as! Int
                    }else {
                        item.Importance = 0
                    }

                    arr.append(item)
                }
            }
        }

        //Result for method: getHelpInformation
        //How to know to which task holds the result?
    }
}

}
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更新

import Foundation

class CSSupport{

// MARK - Properties
var ID: Int!
var SoftekID: String!
var Subject: String!
var LastUpdate: String!
var LastUpdatedBy: String!
var Priority: Int!
var Impact: Int!
var SupportType: String!
var Importance: Int!


// MARK: General
init() {
    self.ID = 0
    self.SoftekID = ""
    self.Subject = ""
    self.LastUpdate = ""
    self.LastUpdatedBy = ""
    self.Priority = 0
    self.Impact = 0
    self.SupportType = ""
    self.Importance = 0
}
}

class Support:NSObject, NSURLSessionDelegate, NSURLSessionDataDelegate, NSURLSessionTaskDelegate{

// MARK: - Properties
var mData: NSMutableData?
var session: NSURLSession!

 override init(){
    super.init()
    var configuration = NSURLSessionConfiguration.defaultSessionConfiguration()
    session = NSURLSession(configuration:configuration, delegate: self, delegateQueue:nil)
}

// MARK: - Methods
func getSupportTickets(){
    var request = NSMutableURLRequest(URL: NSURL(string: "http://10.0.58.137/ISOWeb.UI/api/CSMobile/GetSupportTickets?PageNumber=0&PagingSize=10&TicketStatus=Priority")!,
        cachePolicy: NSURLRequestCachePolicy.UseProtocolCachePolicy,
        timeoutInterval: 20.0)

    let task =  session.dataTaskWithRequest(request)

    mData = NSMutableData()
    task.resume()
}

func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, didReceiveResponse response: NSURLResponse, completionHandler: (NSURLSessionResponseDisposition) -> Void) {

    mData!.length = 0
    completionHandler(NSURLSessionResponseDisposition.Allow)
}

func URLSession(session: NSURLSession, dataTask: NSURLSessionDataTask, didReceiveData data: NSData) {

    mData!.appendData(data)
}

func URLSession(session: NSURLSession, task: NSURLSessionTask, didCompleteWithError error: NSError?) {

    if error != nil{
        println("An error has occured completing the request")
    }else{

         var value = NSString(bytes: mData!.mutableBytes, length: mData!.length, encoding: NSUTF8StringEncoding)
         var jError: NSError?

        switch task.taskIdentifier {
        case 1:
            if let JSONResult: Array<NSDictionary> = NSJSONSerialization.JSONObjectWithData(mData!, options: NSJSONReadingOptions.AllowFragments, error: &jError) as? Array<NSDictionary> {

                if JSONResult.count > 0 {

                    var arr = Array<CSSupport>()

                    for dict in JSONResult{

                        let item = CSSupport()

                        if (dict["ID"] as? Int != nil) {
                            item.ID = dict["ID"] as! Int
                        }else {
                            item.ID = 0
                        }

                        if (dict["SoftekID"] as? String != nil) {
                            item.SoftekID = dict["SoftekID"] as! String
                        }else {
                            item.SoftekID = ""
                        }

                        if (dict["Subject"] as? String != nil) {
                            item.Subject = dict["Subject"] as! String
                        }else {
                            item.Subject = ""
                        }

                        if (dict["LastUpdate"] as? String != nil) {
                            item.LastUpdate = dict["LastUpdate"] as! String
                        }else {
                            item.LastUpdate = ""
                        }

                        if (dict["LastUpdatedBy"] as? String != nil) {
                            item.LastUpdatedBy = dict["LastUpdatedBy"] as! String
                        }else {
                            item.LastUpdatedBy = ""
                        }

                        if (dict["Priority"] as? Int != nil) {
                            item.Priority = dict["Priority"] as! Int
                        }else {
                            item.Priority = 0
                        }

                        if (dict["Impact"] as? Int != nil) {
                            item.Impact = dict["Impact"] as! Int
                        }else {
                            item.Impact = 0
                        }

                        if (dict["SupportType"] as? String != nil) {
                            item.SupportType = dict["SupportType"] as! String
                        }else {
                            item.SupportType = ""
                        }

                        if (dict["Importance"] as? Int != nil) {
                            item.Importance = dict["Importance"] as! Int
                        }else {
                            item.Importance = 0
                        }

                        arr.append(item)
                    }
                }
            }
            break

        case 2:

            break

        default:
            println("No task was found.")
            break
        }
    }
}

}
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dga*_*ood 5

是的，缺少任何类型的可定制存储都令人讨厌，特别是因为标识符仅在每个会话的基础上是唯一的。有几种方法可以解决此问题：

  • 如果您正在使用后台会话或前景和后台会话的混合，我认为您可以做的最好的事情是两级查找，其中将可变字典与每个会话相关联，然后先查找该会话，然后再查找通过每个会话字典中的标识符来完成任务：

    • 对于后台会话，请提供一个标识符用作顶级可变字典中的键。
    • 对于其他会话，请使用会话对象本身作为顶级可变字典中的键。

  • 如果仅使用前台任务（也就是说，不是在后台会话中），则应该能够仅将任务用作字典键，并查找与任务相关的其他数据。

我认为这两种技术均应正常工作。您也许还可以在任务上使用关联的对象来存储其他数据（只要您不使用后台会话）。

您绝对不能做的一件事（我已经提过一个关于此的错误）是NSURLRequest子类并在那里存储其他数据，因为当您请求currentRequest时，NSURLSession返回其自己的NSURLRequest副本（而不是您的自定义子类），并返回当您请求orginalRequest时，您的子类看似随机的实例（与实际的原始请求无关）。

令人惊讶的是，每个人都要花大量的精力来创建外部词典，以解决每个任务和每个会话上缺少简单的refCon对象属性的问题。绝对值得提出一个错误来请求该功能。

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