Rotate a SKShapeNode with texture - swift

Question

I'm trying to rotate an SKShapeNode with a texture, but it's not working. Basically, I have a circle with a texture and I'm trying to make it rotate using the same way I have done with an SKSpriteNode:
let spin = SKAction.rotateByAngle(CGFloat(M_PI/4.0), duration: 1)
The problem is that the circle is rotating, but not the texture. I can check this by using this code:
let wait = SKAction.waitForDuration(0.5)
let block = SKAction.runBlock({
print(self.circle.zRotation)
})
let sequence = SKAction.sequence([wait, block])
self.runAction(SKAction.repeatActionForever(sequence))
This is the code I have for creating the SKShapeNode:
let tex:SKTexture = SKTexture(image: image)
let circle = SKShapeNode(circleOfRadius: 100 )
circle.position = CGPoint(x: self.frame.width / 2, y: self.frame.height / 2 + 200)
circle.strokeColor = SKColor.clearColor()
circle.glowWidth = 1.0
circle.fillColor = SKColor.whiteColor()
circle.fillTexture = tex
self.addChild(circle)
// Runing the action
circle.runAction(spin)
Please help. Thanks in advance!
PS: I know that using an SKSpriteNode would be better but my goal is to place a square image in a circular frame and I figured that using an SKShapeNode would be perfect. If anyone know how to create a circular SKSpriteNode, feel free to post it in the answers section! :)
This is what I'm trying to achieve (with the capability of rotating it):

Answer 1

You can achieve what you want by using SKCropNode and setting its mask property to be a circle texture:
override func didMoveToView(view: SKView) {
let maskShapeTexture = SKTexture(imageNamed: "circle")
let texture = SKTexture(imageNamed: "pictureToMask")
let pictureToMask = SKSpriteNode(texture: texture, size: texture.size())
let mask = SKSpriteNode(texture: maskShapeTexture) //make a circular mask
let cropNode = SKCropNode()
cropNode.maskNode = mask
cropNode.addChild(pictureToMask)
cropNode.position = CGPoint(x: frame.midX, y: frame.midY)
addChild(cropNode)
}
Let's say that picture to mask has a size of 300x300 pixels. The circle you are using as a mask, in that case, has to have the same size. Means the circle itself has to have a radius of 150 pixels (diameter of 300 pixels) when made in image editor.
Mask node determines the visible area of a picture. So don't make it too large. Mask node has to be a fully opaque circle with transparent background.