Singleton? Or is there a better way? - swift

Question

I'm about to build a singleton but I'm not sure if it's the right solution.
I have this problem I have a class that creates a URLSessionTaskDelegate. I would like to use that delegate in another class to get some information from the file upload.
So I was thinking If I could put this plus some other information in to an object like this:
public class UploadQueueCellData
{
let _FileName:String
let _UploadTaskDelegate:URLSessionTaskDelegate
let _ImageData:Data
init(fileName:String,imageData:Data,uploadTaskDelegate:URLSessionTaskDelegate)
{
_FileName = fileName
_ImageData = imageData
_UploadTaskDelegate = uploadTaskDelegate
}
.... etc
}
And then store it in a singleton with a array inside it:
public class ImageUploadQueue
{
private var _queue = [UploadQueueCellData]()
private let imageUploadQueue:ImageUploadQueue? = nil
public func GetImageUploadQueueInstance() -> ImageUploadQueue
{
if imageUploadQueue == nil
{
imageUploadQueue = ImageUploadQueue()
return imageUploadQueue
}
else
{
return imageUploadQueue!
}
}
private init()
{
}
.... etc
}
and then just use that to update information as change happens in another class.
But is there a better way without a singleton ? and am I even doing the singleton correct from a Swift 3 point of view ?
Edit:
so I I see that I'm doing the singleton wrong:
public class ImageUploadQueue
{
private var _queue = [UploadQueueCellData]()
//private let imageUploadQueue:ImageUploadQueue? = nil
static let shared = ImageUploadQueue()
private init()
{
}
Would that be better then? But the question remains is there not a better approach than using the singleton pattern for this? I say better simply because I regard the singleton pattern as a last resort.

Answer 1

I found that my problem arose from the fact that I couldn't get a class I created in one view to display information in another view. my solution to this was the singleton solution above it worked but I felt dirty for using that solution.
I finally found a different way to do this. instead of the singleton I've just created a class containing the Array just like the singleton did above like this:
public class ImageUploadQueue
{
private var _queue = [UploadQueueCellData]()
....//Class specific code
}
and then just use that class as a reference to the Data just like the singleton with the exception that my class above it
had this function that enabled the view to use the information in the queue
public func GetUploadQueue()->ImageUploadQueue
{
return _networkRequester.uploadQueue
}
However that class is created by viewA and I needed the information in ViewB.
so I did this in viewB
var uploader:ImageUpload
{
get
{
return ((self.tabBarController!.viewControllers![0] as? UINavigationController)?.viewControllers[0] as! ViewController).uploader
}
set
{
(self.tabBarController!.viewControllers![0] as! ViewController).uploader = newValue
}
}
And it solved my initial problem with not being able to get information from viewA to ViewB at the same time avoided the use of a singleton.