Download a video and play with AVPlayer,AVPlayerLayer

DownloadAndPlay.swift

class ViewController: UIViewController {

    private var player:AVPlayer?
    private var playerLayer:AVPlayerLayer?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        print(NSHomeDirectory())
    }
    
    @IBAction func download() {
        
        let videoUrl = "http://7xp99e.com2.z0.glb.qiniucdn.com/2/video_article/6351A5E8_7F6C_4717_B91D_FE750634B5D5.mp4"
        
        let documentPath = NSSearchPathForDirectoriesInDomains(.DocumentDirectory, NSSearchPathDomainMask.AllDomainsMask, true).first!
        let destPath = NSString(string: documentPath).stringByAppendingPathComponent("video.mp4") as String
        
        if NSFileManager.defaultManager().fileExistsAtPath(destPath) {
            print("file already exist at \(destPath)")
            self.playVideo(NSURL(fileURLWithPath: destPath))
            return
        }
        
        NSURLSession.sharedSession().downloadTaskWithURL(NSURL(string: videoUrl)!) { (location:NSURL?, response:NSURLResponse?, err:NSError?) -> Void in
            if let _ = location {
                do {
                    try NSFileManager.defaultManager().moveItemAtURL(location!, toURL: NSURL(fileURLWithPath: destPath))
                    self.playVideo(NSURL(fileURLWithPath: destPath))
                }
                catch let error as NSError {
                    print("move file error: \(error.localizedDescription)")
                }
            } else {
                print("location err: \(location)")
            }
        }.resume()
    }

    private func playVideo(localPath:NSURL) {
        
        self.player = AVPlayer(URL: localPath)
        
        self.playerLayer = AVPlayerLayer(player: self.player)
        self.playerLayer?.frame = self.view.frame
        self.view.layer.addSublayer(self.playerLayer!)
        self.player?.play()
    }
}
// to support the http,open info.plist,add `App Transport Security Settings` then add `Allow Arbitrary Loads` item and set value `YES`