Swift 返回一個漸變的 UIImageView

func createGradientLayer(color : UIColor, width : CGFloat, height : CGFloat) -> UIImageView{
     let layer : CAGradientLayer = CAGradientLayer ()
     let gradientColors: [CGColor] = [color.CGColor, UIColor.whiteColor().CGColor]
     let gradientLocations: [CGFloat] = [0.0, 1.0]
     layer.colors = gradientColors
     layer.locations = gradientLocations
     layer.startPoint = CGPointMake(0, 0)
     layer.endPoint = CGPointMake(1, 0)
     layer.frame = CGRectMake(0, 0, width, height)
     let imageView : UIImageView = UIImageView(
     imageView.layer.addSublayer(layer)
     return imageView
}
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