A super simple and performant way to make any view wobble in tvOS

WobbleView.swift

//
//  WobbleView.swift
//  WobbleView
//
//  Created by Matt Jones on 4/28/16.
//  Copyright © 2016 WillowTree, Inc. All rights reserved.
//

import UIKit

class WobbleView: UIView {
    
    var focusedFrameGuide: UILayoutGuide {
        return renderedWobbleView.focusedFrameGuide
    }

    private var renderedWobbleView: UIImageView = {
        let view = UIImageView()
        view.adjustsImageWhenAncestorFocused = true
        view.translatesAutoresizingMaskIntoConstraints = false
        return view
    }()
    
    override func willMoveToSuperview(newSuperview: UIView?) {
        super.willMoveToSuperview(newSuperview)
        renderedWobbleView.removeFromSuperview()
        renderedWobbleView.image = nil
    }
    
    override func didMoveToSuperview() {
        super.didMoveToSuperview()
        
        guard let superview = superview else {
            return
        }
        
        superview.addSubview(renderedWobbleView)
        renderedWobbleView.topAnchor.constraintEqualToAnchor(self.topAnchor).active = true
        renderedWobbleView.bottomAnchor.constraintEqualToAnchor(self.bottomAnchor).active = true
        renderedWobbleView.leftAnchor.constraintEqualToAnchor(self.leftAnchor).active = true
        renderedWobbleView.rightAnchor.constraintEqualToAnchor(self.rightAnchor).active = true
    }
    
    override func didAddSubview(subview: UIView) {
        super.didAddSubview(subview)
        setNeedsLayout()
    }
    
    override func layoutSubviews() {
        super.layoutSubviews()
        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0)) {
            UIGraphicsBeginImageContextWithOptions(self.bounds.size, false, 0)
            CGContextTranslateCTM(UIGraphicsGetCurrentContext(), 0, 0)
            self.layer.hidden = false
            self.layer.renderInContext(UIGraphicsGetCurrentContext()!)
            let image = UIGraphicsGetImageFromCurrentImageContext()
            UIGraphicsEndImageContext()
            
            dispatch_async(dispatch_get_main_queue()) {
                self.renderedWobbleView.image = image
                self.hidden = true
            }
        }
    }

}