使用NSURLSession下载代理（IOS，swift）

我尝试使用NSURLSession在swift中下载文件：我的代理从未被调用过，我不知道为什么。有人可以帮忙吗？使用NSURLSession下载代理（IOS，swift）

代码：我的班级有以下协议：

class ViewController: UIViewController, NSURLSessionDelegate {

在我的课我有一个下载的zip功能：

func download_zip(sURL: String, sToLocation: String) { 

    var delegate = self; 
    delegate.storePath=sToLocation; 
    delegate.progressView=progressView; 
    struct SessionProperties { 
     static let identifier : String! = "url_session_background_download" 
    } 
    var configuration = NSURLSessionConfiguration.backgroundSessionConfigurationWithIdentifier(SessionProperties.identifier) 
    var backgroundSession = NSURLSession(configuration: configuration, delegate: delegate, delegateQueue: nil) 
    var url = NSURLRequest(URL: NSURL(string: sURL)!) 
    var downloadTask = backgroundSession.downloadTaskWithRequest(url) 
    downloadTask.resume() 

}

在我的课，我有一些代理功能：

//MARK: session delegate 
func URLSession(session: NSURLSession, didBecomeInvalidWithError error: NSError?) { 
    println("session error: \(error?.localizedDescription).") 
} 

func URLSession(session: NSURLSession, didReceiveChallenge challenge: NSURLAuthenticationChallenge, completionHandler: (NSURLSessionAuthChallengeDisposition, NSURLCredential!) -> Void) { 
    completionHandler(NSURLSessionAuthChallengeDisposition.UseCredential, NSURLCredential(forTrust: challenge.protectionSpace.serverTrust)) 
} 

func URLSession(session: NSURLSession, downloadTask: NSURLSessionDownloadTask, didFinishDownloadingToURL location1: NSURL) { 
    println("session \(session) has finished the download task \(downloadTask) of URL \(location1).") 


} 

func URLSession(session: NSURLSession, downloadTask: NSURLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64) { 
    println("session \(session) download task \(downloadTask) wrote an additional \(bytesWritten) bytes (total \(totalBytesWritten) bytes) out of an expected \(totalBytesExpectedToWrite) bytes.") 


} 

func URLSession(session: NSURLSession, downloadTask: NSURLSessionDownloadTask, didResumeAtOffset fileOffset: Int64, expectedTotalBytes: Int64) { 
    println("session \(session) download task \(downloadTask) resumed at offset \(fileOffset) bytes out of an expected \(expectedTotalBytes) bytes.") 
} 

func URLSession(session: NSURLSession, task: NSURLSessionTask, didCompleteWithError error: NSError?) { 
    if error == nil { 
     println("session \(session) download completed") 
    } else { 
     println("session \(session) download failed with error \(error?.localizedDescription)") 
    } 
} 

func URLSessionDidFinishEventsForBackgroundURLSession(session: NSURLSession) { 
    println("background session \(session) finished events.") 

    if !session.configuration.identifier.isEmpty { 
     callCompletionHandlerForSession(session.configuration.identifier) 
    } 
} 

//MARK: completion handler 
func addCompletionHandler(handler: CompleteHandlerBlock, identifier: String) { 
    handlerQueue[identifier] = handler 
} 

func callCompletionHandlerForSession(identifier: String!) { 
    var handler : CompleteHandlerBlock = handlerQueue[identifier]! 
    handlerQueue!.removeValueForKey(identifier) 
    handler() 
}

不调用委托函数。有没有人看到这个问题？

来源

2015-05-29 mcfly soft

是否NSURLSessionDownloadDelegate子类NSURLSessionDelegate？ – Leonardo

您是否将NSURLSessionDelegate和NSURLSessionDownloadDelegate的委托设置为您的类？ – Icaro

感谢您的帮助。对困惑感到抱歉。 protocoll NSURLSessionDownloadDelegate是我的一个尝试。我会更新这个问题并删除它。我想没有必要使用这个协议。 –

尝试存储NSURLSession到属性，我认为您的会话可能会被ARC从内存中清除

来源

2015-05-29 13:34:43 Leonardo

感谢您的帮助，但它仍然无法正常工作。 –

您有：

var backgroundSession = NSURLSession(configuration: configuration, delegate: delegate, delegateQueue: nil)

它应该是：

var backgroundSession = NSURLSession(configuration: configuration, delegate: self, delegateQueue: NSOperationQueue.mainQueue())

代表必须设置为自我。还要将“NSURLSessionDataDelegate”添加到协议中。

来源

2015-10-16 20:25:02

swift 4重命名为OperationQueue.main –

使用NSURLSession下载代理（IOS，swift）

回答

相关问题