How to draw a hollow circle with two different col

Im very familiar with drawing a filled createEllipseInRect shape node, but I was wondering if there's a way to do this programmatically. I want a circle thats split through the center with two separate colors on either side. I don't have code since I have no idea where to start with this.

something like this

Help much appreciated.

You can try using SKCropNode, this allows you to show only half of each circle. See below code for example of this.

class GameScene: SKScene {
override func didMoveToView(view: SKView) {

    anchorPoint = CGPointMake(0.5, 0.5)

    // Half Circle #1

    let myCrop1 = SKCropNode()

    let myMask1 = SKSpriteNode(color: UIColor.blackColor(), size: CGSizeMake(100, 100))
    myMask1.position.y = -50

    let circle1 = SKShapeNode(circleOfRadius: 50)
    circle1.lineWidth = 0
    circle1.fillColor = UIColor.blueColor()

    myCrop1.addChild(circle1)
    myCrop1.maskNode = myMask1
    addChild(myCrop1)

    // Half Circle #2

    let myCrop2 = SKCropNode()

    let myMask2 = SKSpriteNode(color: UIColor.blackColor(), size: CGSizeMake(100, 100))
    myMask2.position.y = 50

    let circle2 = SKShapeNode(circleOfRadius: 50)
    circle2.lineWidth = 0
    circle2.fillColor = UIColor.redColor()

    myCrop2.addChild(circle2)
    myCrop2.maskNode = myMask2
    addChild(myCrop2)


    }

}

I haven't really used SKCropNode that much before, so I'm not sure how good my code is, but below is the result I got on my iPhone.

EDIT: You should be able to add a 3rd SKCropNode to make the centre of the circle transparent if required.

EDIT: Below for transparent centre

class GameScene: SKScene {
override func didMoveToView(view: SKView) {

    anchorPoint = CGPointMake(0.5, 0.5)

    let transparentCenterMask = SKShapeNode(circleOfRadius: 50)
    transparentCenterMask.lineWidth = 20
    let transparentCenterCrop = SKCropNode()
    transparentCenterCrop.maskNode = transparentCenterMask

    // Half Circle #1

    let myCrop1 = SKCropNode()

    let myMask1 = SKSpriteNode(color: UIColor.blackColor(), size: CGSizeMake(100, 100))
    myMask1.position.y = -50

    let circle1 = SKShapeNode(circleOfRadius: 50)
    circle1.lineWidth = 0
    circle1.fillColor = UIColor.blueColor()

    myCrop1.addChild(circle1)
    myCrop1.maskNode = myMask1
    transparentCenterCrop.addChild(myCrop1)

    // Half Circle #2

    let myCrop2 = SKCropNode()

    let myMask2 = SKSpriteNode(color: UIColor.blackColor(), size: CGSizeMake(100, 100))
    myMask2.position.y = 50

    let circle2 = SKShapeNode(circleOfRadius: 50)
    circle2.lineWidth = 0
    circle2.fillColor = UIColor.redColor()

    myCrop2.addChild(circle2)
    myCrop2.maskNode = myMask2
    transparentCenterCrop.addChild(myCrop2)

    addChild(transparentCenterCrop)


    }

}