@IBDesignable/@IBInspectable GradientView (linear gradient, 2 stops)

GradientView.swift

// ©2015 Massimiliano Raber, MIT license
// @IBDesignable/@IBInspectable GradientView (linear gradient, 2 stops)

import UIKit

@IBDesignable
class GradientView: UIView {
	
	@IBInspectable var startColor: UIColor = UIColor.whiteColor() {
		didSet {
			gradientLayer.colors = [ startColor.CGColor, endColor.CGColor ]
		}
	}
	
	@IBInspectable var endColor: UIColor = UIColor.blackColor() {
		didSet {
			gradientLayer.colors = [ startColor.CGColor, endColor.CGColor ]
		}
	}

	@IBInspectable var startPoint: CGPoint = CGPoint(x:0.5, y:0) {
		didSet {
			gradientLayer.startPoint = startPoint
		}
	}
	@IBInspectable var endPoint: CGPoint = CGPoint(x:0.5, y:1) {
		didSet {
			gradientLayer.endPoint = endPoint
		}
	}
	
	private var gradientLayer: CAGradientLayer = CAGradientLayer()

	override class func layerClass() -> AnyClass {
		return CAGradientLayer.self
	}
	
	private func setupLayer() {
		self.layer.insertSublayer(gradientLayer, atIndex: 0)
	}

	override init(frame: CGRect) {
		super.init(frame: frame)
		setupLayer()
	}
	
	required init(coder aDecoder: NSCoder) {
		super.init(coder: aDecoder)
		setupLayer()
	}
	
	override func layoutSubviews() {
		gradientLayer.frame = self.bounds
	}
}