Simple download manager made in Swift using NSURLConnection. Not much to explain.

Usage

Add the source files, the project or the compiled framework to your project. Then, it's as simple as this:

class Dummy: DownloadManagerDelegate {

    init() {
        let downloadDirectory = let documentsDirectory = (NSSearchPathForDirectoriesInDomains(.DocumentDirectory, .UserDomainMask, true)[0] as! NSString).stringByAppendingPathComponent("Downloads")

        let url  = NSURL(string: "http://burnbit.com/download/353474/enwiki_20150403_pages_articles_xml_bz2")
        let path = downloadDirectory.stringByAppendingPathComponent("wiki-pages-articles-xml.bz2")

        DownloadManager.sharedInstance.subscribe(self)
        DownloadManager.sharedInstance.download(url, filePath: path)
    }

    deinit {
        DownloadManager.sharedInstance.unsubscribe(self)
    }

}

extension Dummy {

    func downloadManager(downloadManager: DownloadManager, downloadDidFail url: NSURL, error: NSError) {
        println("Failed to download: \(url.absoluteString)")
    }

    func downloadManager(downloadManager: DownloadManager, downloadDidStart url: NSURL, resumed: Bool) {
        println("Started to download: \(url.absoluteString)")
    }
    
    func downloadManager(downloadManager: DownloadManager, downloadDidFinish url: NSURL) {
        println("Finished downloading: \(url.absoluteString)")
    }
    
    func downloadManager(downloadManager: DownloadManager, downloadDidProgress url: NSURL, totalSize: UInt64, downloadedSize: UInt64, percentage: Double, averageDownloadSpeedInBytes: UInt64, timeRemaining: NSTimeInterval) {
        println("Downloading \(url.absoluteString) (Percentage: \(percentage))")
    }
    
}

Quick overview

DownloadManager

public class DownloadManager {
    public class var sharedInstance: DownloadManager { /* ... */ }
    
    public func subscribe(delegate: DownloadManagerDelegate) { /* ... */ }
    public func unsubscribe(delegate: DownloadManagerDelegate) { /* ... */ }
    public func isDownloading(url: NSURL) -> Bool { /* ... */ }
    public func download(url: NSURL, filePath: String) -> Bool { /* ... */ }
    public func stopDownloading(url: NSURL) { /* ... */ }
}

DownloadManagerDelegate

public protocol DownloadManagerDelegate: class {
    func downloadManager(downloadManager: DownloadManager, downloadDidFail url: NSURL, error: NSError)
    func downloadManager(downloadManager: DownloadManager, downloadDidStart url: NSURL, resumed: Bool)
    func downloadManager(downloadManager: DownloadManager, downloadDidFinish url: NSURL)
    func downloadManager(downloadManager: DownloadManager, downloadDidProgress url: NSURL, totalSize: UInt64, downloadedSize: UInt64, percentage: Double, averageDownloadSpeedInBytes: UInt64, timeRemaining: NSTimeInterval)
}