Swift button failure

/
//  ViewController.swift
//  iHub
//
//  Created by Timothy Miller-Klugman on 3/11/17.
//  Copyright © 2017 Timothy Miller-Klugman. All rights reserved.
//

import UIKit
import AVFoundation
import AVKit

let cellid = "cell"

class Post {
    var videoName: String?
    var views: String?
    var videothumbnail: String?
    var videourl: NSURL?
}
class VideoFeedController: UICollectionViewController, UICollectionViewDelegateFlowLayout {

    var posts = [Post]()
    var json: [Any]?


    override func viewDidLoad() {
        super.viewDidLoad()
              let CatagoryMain = Post()

        posts.append(CatagoryMain)

        collectionView?.backgroundColor = UIColor(red:0.13, green:0.13, blue:0.13, alpha:1.0)
        navigationItem.title  = "Main Video Feed"
        collectionView?.alwaysBounceVertical = true
        collectionView?.register(VideoFeedCell.self, forCellWithReuseIdentifier: cellid)

        let urlString = ""

        let url = URL(string: urlString)
        URLSession.shared.dataTask(with:url!) { (data, response, error) in
            if error != nil {
                print("failed")
            } else {
                do {

                    let parsedData = try JSONSerialization.jsonObject(with: data!, options: []) as! [String:Any]
                    let currentVideo = parsedData["video"] as! [String:Any]


                    if let currentVideoTitle = currentVideo["title"] as? String {
                        print(currentVideoTitle)
                        CatagoryMain.videoName = "\(currentVideoTitle)"
                        self.collectionView?.reloadData()

                    }

                    if let currentViewCount = currentVideo["views"] as? String {
                        CatagoryMain.views = "\(currentViewCount)"
                         self.collectionView?.reloadData()
                    }

                    if let currentVideoThumbnail = currentVideo["thumb"] as? String {
                        CatagoryMain.videothumbnail = "\(currentVideoThumbnail)"
                        self.collectionView?.reloadData()
                    }

                    if let currentVideoURL = currentVideo["url"] as? String {
                        CatagoryMain.videourl = NSURL(string: "\(currentVideoURL)")
                        print(currentVideoURL)
                        self.collectionView?.reloadData()

                    }

                } catch let error as NSError {
                    print(error)
                }
            }

            }.resume()
    }
    override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return  posts.count
    }

    override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let videoCell =  collectionView.dequeueReusableCell(withReuseIdentifier: cellid, for: indexPath) as! VideoFeedCell

        videoCell.post = posts[indexPath.item]
        return videoCell

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {


        return CGSize(width: 350, height: 150)
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
                               //top //left //bottom //right
        return UIEdgeInsetsMake(20, 0, 0, 0)
    }
}

class VideoFeedCell: UICollectionViewCell {


    var post: Post? {
        didSet {
            if let name = post?.videoName {

                let attributedText = NSMutableAttributedString(string: name, attributes: [NSFontAttributeName: UIFont.boldSystemFont(ofSize: 14)])

                attributedText.append(NSAttributedString(string:"\n\(self.post?.views ?? "") Views", attributes: [NSFontAttributeName: UIFont.systemFont(ofSize: 12), NSForegroundColorAttributeName: UIColor(red: 155/255, green: 161/255, blue: 171/255, alpha: 1)]))

                videoNameLabel.attributedText = attributedText
            }


        }

    }


    override init(frame: CGRect) {
        super.init(frame: frame)

        setupViews()
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    let videoImageThumbnail: UIImageView = {
         let thumbnail = UIImageView()
         thumbnail.contentMode = .scaleAspectFit
         thumbnail.backgroundColor = UIColor.red
         thumbnail.translatesAutoresizingMaskIntoConstraints = false

        return thumbnail
    }()

    let videoNameLabel: UILabel = {
        let label = UILabel()
        label.numberOfLines = 2
        return label

    }()

    let playButton: UIButton = {
        let button = UIButton()
        let image = UIImage(named: "VideoIcon.png") as UIImage?
        button.backgroundImage(for: .normal)
        button.addTarget(self, action: #selector(pressBackButton(button:)), for: .touchUpInside)
        button.setImage(image, for: .normal)

        return button
    }()

    func pressBackButton(button: UIButton) {
    print("test")
        if let playVideoButtonURL = post?.videourl {

            let player = AVPlayer(url: playVideoButtonURL as URL)
            let playerLayer = AVPlayerLayer(player:player)
            playerLayer.frame = CGRect(x: 100, y: 200, width: 100, height: 100)
            playerLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
            self.layer.addSublayer(playerLayer)
            player.play()

        }

    }

    func setupViews() {

        backgroundColor = UIColor(red:0.22, green:0.22, blue:0.23, alpha:1.0)

        self.layer.cornerRadius = 2
        self.layer.shadowColor = UIColor(red:0.26, green:0.27, blue:0.27, alpha:1.0).cgColor
        self.layer.shadowOffset = CGSize(width: 0, height: 1)
        self.layer.shadowOpacity = 0.9
        self.layer.shadowRadius = 5

        self.clipsToBounds = false
        self.layer.masksToBounds = false


        addSubview(videoNameLabel)
        self.addSubview(playButton)
        addSubview(videoImageThumbnail)

        // Horizontal
        addConstraintsWithFormat(format: "H:|-8-[v0(44)]-8-[v1]|", view: videoImageThumbnail, videoNameLabel)
        addConstraintsWithFormat(format: "H:|-280-[v0(44)]", view: playButton)

        // Vertical
        addConstraintsWithFormat(format: "V:|-8-[v0]", view: videoNameLabel)
        addConstraintsWithFormat(format: "V:|-8-[v0(44)]", view: videoImageThumbnail)
        addConstraintsWithFormat(format: "V:|-90-[v0(44)]", view: playButton)
    }
}

extension UIView {

    func addConstraintsWithFormat(format: String, view: UIView...) {

        var viewDictionary = [String: UIView]()

        for (index, view) in view.enumerated() {
            let key = "v\(index)"
            viewDictionary[key] = view
            view.translatesAutoresizingMaskIntoConstraints = false
        }

        addConstraints(NSLayoutConstraint.constraints(withVisualFormat: format, options: NSLayoutFormatOptions(), metrics: nil, views: viewDictionary))

    }

}