commentView.swift

        static func showCommentOnView(view: UIView, comment: String = "", topPadding: CGFloat = 0) {
            if let view = view as? UITableView {
                view.backgroundView = nil
            } else if let view = view as? UICollectionView {
                view.backgroundView = nil
            }
            while let commentView = view.viewWithTag(1001) {
                commentView.removeFromSuperview();
            }
            if !comment.isEmpty {
                // Comment View
                let commentView = getCommentView(comment)
                if let view = view as? UITableView {
                    view.backgroundView = commentView
                } else if let view = view as? UICollectionView {
                    view.backgroundView = commentView
                } else {
                    view.addSubview(commentView);
                    view.bringSubviewToFront(commentView)
                    commentView.frame = view.bounds
                }
                commentView.translatesAutoresizingMaskIntoConstraints = true
                commentView.autoresizingMask = [.FlexibleWidth, .FlexibleHeight]
             }
        }
        
        static func getCommentView(comment: String) -> UIView {
            let commentView = UIView();
            commentView.tag = 1001;
            // Comment Label
            let commentLabel = UILabel();
            commentLabel.text = comment
            commentLabel.textAlignment = NSTextAlignment.Center;
            commentLabel.textColor = UIColor.grayColor();
            commentLabel.numberOfLines = 0;
            commentLabel.lineBreakMode = .ByWordWrapping
            commentLabel.tag = 1001;
            commentLabel.translatesAutoresizingMaskIntoConstraints = false
            commentView.addSubview(commentLabel);
            commentView.addConstraint(NSLayoutConstraint(item: commentLabel, attribute: NSLayoutAttribute.Leading, relatedBy: NSLayoutRelation.Equal, toItem: commentView, attribute: NSLayoutAttribute.Leading, multiplier: 1, constant: 20))
            commentView.addConstraint(NSLayoutConstraint(item: commentLabel, attribute: NSLayoutAttribute.CenterX, relatedBy: NSLayoutRelation.Equal, toItem: commentView, attribute: NSLayoutAttribute.CenterX, multiplier: 1, constant: 0))
            commentView.addConstraint(NSLayoutConstraint(item: commentLabel, attribute: NSLayoutAttribute.CenterY, relatedBy: NSLayoutRelation.Equal, toItem: commentView, attribute: NSLayoutAttribute.CenterY, multiplier: 1, constant: 0))
            commentView.addConstraint(NSLayoutConstraint(item: commentLabel, attribute: NSLayoutAttribute.Top, relatedBy: NSLayoutRelation.Equal, toItem: commentView, attribute: NSLayoutAttribute.Top, multiplier: 1, constant: 20))
            return commentView
        }