Draw gradient under UIBezierPath - ios

Question

I have drawn a curved line. I want to put a gradient from the view all the way up to the line (so that the gradient curves along with the line.)
edit: here is a photo of what the code below produces:
I know how to draw the line, and I know how to add a regular gradient, but just not the two together. Here is my code:
override func drawRect(rect: CGRect) {
// draw the curved line, this code works just fine.
let path1 = UIBezierPath()
path1.lineWidth = 1.1
UIColor.greenColor().setStroke()
path1.moveToPoint(CGPoint(x: 0, y: bounds.height/2))
path1.addQuadCurveToPoint(CGPoint(x: bounds.width, y: bounds.height/2), controlPoint: CGPoint(x: bounds.width/2, y: (bounds.height * 0.75)))
path1.stroke()
// my attempt to draw the gradient:
let gradient = CAGradientLayer()
gradient.startPoint = CGPoint(x: 1, y: 1)
gradient.endPoint = CGPoint(x: 0, y: 0)
let colors = [UIColor.whiteColor().CGColor, UIColor(red: 0, green: 1, blue: 1, alpha: 0.4).CGColor]
gradient.colors = colors
// the following line is where I need help
gradient.frame = CGRectMake(0, 475, bounds.width, path1.bounds.height)
layer.addSublayer(gradient)
}
what can I set gradient.frame equal to so that it's upper limit is the previously drawn path? Answer in Swift please (i've seen a lot of other questions on this subject but they are all in objective C)
Thanks

Answer 1

I have found the answer.
The following code gave me this:
.
Here is the code:
override func drawRect(rect: CGRect) {
//draw the line of UIBezierPath
let path1 = UIBezierPath()
path1.lineWidth = 1.1
UIColor(white: 1, alpha: 1).setStroke()
path1.moveToPoint(CGPoint(x: 0, y: bounds.height/2))
path1.addQuadCurveToPoint(CGPoint(x: bounds.width, y: bounds.height/2), controlPoint: CGPoint(x: bounds.width/2, y: (bounds.height * 0.65)))
path1.stroke()
// add clipping path. this draws an imaginary line (to create bounds) from the
//ends of the UIBezierPath line down to the bottom of the screen
let clippingPath = path1.copy() as! UIBezierPath
clippingPath.addLineToPoint(CGPoint(x: self.bounds.width, y: self.bounds.height))
clippingPath.addLineToPoint(CGPoint(x: 0, y: bounds.height))
clippingPath.closePath()
clippingPath.addClip()
// create and add the gradient
let colors = [UIColor(red: 0, green: 1, blue: 1, alpha: 0.45).CGColor, UIColor.whiteColor().CGColor]
let colorSpace = CGColorSpaceCreateDeviceRGB()
let colorLocations:[CGFloat] = [0.0, 1.0]
let gradient = CGGradientCreateWithColors(colorSpace,
colors,
colorLocations)
let context = UIGraphicsGetCurrentContext()
let startPoint = CGPoint(x: 1, y: 1)
let endPoint = CGPoint(x: 1, y: bounds.maxY)
// and lastly, draw the gradient.
CGContextDrawLinearGradient(context, gradient, startPoint, endPoint, CGGradientDrawingOptions.DrawsAfterEndLocation)
}