我正在使用swift 2编写应用程序,我需要在后台会话中在我的服务器上上传照片和视频。出于这个原因,我写了这段代码:
let configuration = NSURLSessionConfiguration.backgroundSessionConfigurationWithIdentifier(SessionProperties.identifier)
//let configuration = NSURLSessionConfiguration.defaultSessionConfiguration();
let queue = NSOperationQueue.mainQueue()
// To limit to 1 upload at a time
queue.maxConcurrentOperationCount = 1
let backgroundSession = NSURLSession(configuration: configuration, delegate: self, delegateQueue: queue)
for postingFile in postingFileList {
let request = NSMutableURLRequest(URL: NSURL(string: NetworkUtil().serverUrl+"/upload/upload/v1.0/events/\(postingFile.event.id)/files/\(postingFile.file.id)?frag-start=0&frag-size=\(postingFile.fileSize)")!)
request.HTTPMethod = "POST"
request.setValue("Keep-Alive", forHTTPHeaderField: "Connection")
let uploadTask = backgroundSession.uploadTaskWithRequest(request, fromFile: postingFile.url)
//let uploadTask = backgroundSession.uploadTaskWithRequest(request, fromFile: postingFile.url, completionHandler: { (NSData, NSURLResponse, NSError) in
// print("completion handler")
//})
uploadTask.resume()
}
此代码在第<:p>行崩溃
let uploadTask = backgroundSession.uploadTaskWithRequest(request, fromFile: postingFile.url)
它说:
由于未捕获的异常'NSInvalidArgumentException'而终止应用程序,原因:'无法读取文件:///var/mobile/Media/DCIM/100APPLE/IMG_0361.JPG'
如果我不使用后台会话,请改用此配置:
let configuration = NSURLSessionConfiguration.defaultSessionConfiguration();
没有崩溃,上传完成。
您是否知道使用文件进行后台会话会发生什么?
答案 0 :(得分:1)
这可能是许可问题。您正尝试从后台进程访问非沙盒文件URL。尝试将文件本地移动到沙箱目录,然后在后台上传。