An easy approach to defining a Blur View in Swift

BlurView.swift

//
//  BlurView.swift
//  Created by Kristopher Jackson.
//

class BlurView: UIView {
    
    // Can set style of blur after initialization
    var style: UIBlurEffect.Style {
        get {
            return self.effectStyle
        }
        set {
            self.effectStyle = newValue
            self.blurView.removeFromSuperview()
            self.createBlurView(withStyle: newValue)
            self.addSubview(self.blurView)
        }
    }
    
    private var blurView: UIVisualEffectView!
    private var effectStyle: UIBlurEffect.Style!
    
    override init(frame: CGRect) {
        super.init(frame: .zero)
        self.setUp(withStyle: .dark)
    }
    
    required init(style: UIBlurEffect.Style = .dark) {
        super.init(frame: .zero)
        self.setUp(withStyle: style)
    }
    
    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        self.setUp(withStyle: .dark)
    }
    
    private func setUp(withStyle style: UIBlurEffect.Style) {
        self.effectStyle = style
        self.backgroundColor = .clear
        self.createBlurView(withStyle: style)
        self.addSubview(self.blurView)
    }
    
    private func createBlurView(withStyle style: UIBlurEffect.Style) {
        let blurEffect = UIBlurEffect(style: style)
        let view = UIVisualEffectView(effect: blurEffect)
        view.frame.origin = .zero
        view.frame.size = self.frame.size
        view.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        self.blurView = view
    }

}