Full screen background view for iOS that adds blur and vibrancy effects.

BackgroundImageView.swift

class BackgroundImageView : UIView {
    private let bgImage = UIImageView(forAutoLayout: ())
    private var blurView:UIVisualEffectView!
    private var vibrancyView:UIVisualEffectView!
    private var didSetupConstraints = false
    
    var containerView: UIView? = nil {
        willSet(container) {
            removeContainerViewFromSuperview()
            
            vibrancyView.contentView.addSubview(container!)
        }
    }
    
    init(imageName: String) {
        super.init()
        
        let screenSize: CGRect = UIScreen.mainScreen().bounds
        
        bgImage.image = UIImage(named: imageName)
        // Scale relative to the size of the iPhone 6 Plus: http://martinnormark.com/smooth-transition-from-launch-image-to-view-controller-in-ios/
        bgImage.transform = CGAffineTransformMakeScale(screenSize.width / 414, screenSize.height / 736)
        
        self.addSubview(bgImage)
        
        let blurEffect = UIBlurEffect(style: .Dark)
        self.blurView = UIVisualEffectView(effect: blurEffect)
        self.blurView.setTranslatesAutoresizingMaskIntoConstraints(false)
        
        self.addSubview(blurView)
        
        let vibrancyEffect = UIVibrancyEffect(forBlurEffect: blurEffect)
        vibrancyView = UIVisualEffectView(effect: vibrancyEffect)
        vibrancyView.setTranslatesAutoresizingMaskIntoConstraints(false)
        
        blurView.contentView.addSubview(vibrancyView)
    }
    
    override init(frame: CGRect) {
        super.init(frame: frame)
    }

    required init(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }
    
    override func updateConstraints() {
        
        if (!didSetupConstraints) {
            bgImage.autoCenterInSuperview()
            containerView?.autoPinEdgesToSuperviewEdgesWithInsets(UIEdgeInsetsZero)
            blurView.autoPinEdgesToSuperviewEdgesWithInsets(UIEdgeInsetsZero)
            vibrancyView.autoPinEdgesToSuperviewEdgesWithInsets(UIEdgeInsetsZero)
            
            didSetupConstraints = true
        }
        
        super.updateConstraints()
    }
    
    private func removeContainerViewFromSuperview() {
        if (containerView?.superview? != nil) {
            containerView?.removeFromSuperview()
        }
    }
}