UIView subclass for Core Animation lovers

LayerView.swift

import UIKit

final class LayerView<Layer: CALayer>: UIView {
	var implicitAnimationsEnabled: Bool = false
	var implicitlyAnimatableEvents: [String]? = nil

	var genericLayer: Layer {
		return layer as! Layer
	}

	init(frame: CGRect = CGRect.zero, configuration: ((Layer) -> Void)? = nil) {
		super.init(frame: frame)
		configuration?(genericLayer)
	}

	override class func layerClass() -> AnyClass {
		return Layer.self
	}

	override func actionForLayer(layer: CALayer, forKey event: String) -> CAAction? {
		if implicitAnimationsEnabled {
			if implicitlyAnimatableEvents == nil || implicitlyAnimatableEvents!.contains(event) {
				return nil
			}
		}
		return super.actionForLayer(layer, forKey: event)
	}

	func update(@noescape closure: (Layer) -> Void) {
		closure(genericLayer)
	}
}