Physics body as an SKTexture does not rotate - xcode

Question

I am making a game where the main character rotates, however, I want to use an SKTexture to set custom boundaries to the character sprite node. However, when I do this, my character does not rotate. When I use a regular circleOfRadius (because my sprite is round, but no perfectly round) it rotates, but is not accurate on collisions. Here is my code:
var mainSpriteTexture = SKTexture(imageNamed: "Main")
mainSprite = SKSpriteNode(texture: mainSpriteTexture)
mainSprite.setScale(0.2)
mainSprite.position = CGPoint(x: self.frame.width / 2, y: 100)
mainSprite.physicsBody = SKPhysicsBody(texture: mainSpriteTexture, size: mainSprite.size)
mainSprite.physicsBody?.categoryBitMask = PhysicsCatagory.player
mainSprite.physicsBody?.collisionBitMask = PhysicsCatagory.platform | PhysicsCatagory.ground
mainSprite.physicsBody?.contactTestBitMask = PhysicsCatagory.platform | PhysicsCatagory.ground | PhysicsCatagory.score
mainSprite.physicsBody?.affectedByGravity = true
mainSprite.physicsBody?.dynamic = true
mainSprite.physicsBody?.allowsRotation = true
self.addChild(mainSprite)
override func update(currentTime: CFTimeInterval) {
/* Called before each frame is rendered */
updateSpritePosition()
if gameStarted == true {
if died == false {
mainSprite.physicsBody?.velocity = CGVectorMake(direction, (mainSprite.physicsBody?.velocity.dy)!)
}
else if died == true {
mainSprite.physicsBody?.velocity = CGVectorMake(0, (mainSprite.physicsBody?.velocity.dy)!)
}
}
Here is the shape I am using: http://imgur.com/JCeEAbv

Answer 1

Not really sure how you rotate your sprite, or move it, but if I give it a certain default rotation and drop it on the surface, it rotates for me as it should (I used a picture you have provided). This way, it will not land perfectly on the ground (zRotation 0.0).
Try to use this:
mainSprite.zRotation = 0.1 //note that these are radians
and drop it on a flat surface.
Same thing you could probably achieve by applying a small force or impulse which should affect sprite's zRotation property... What you are going to use, depends on how you move your node actually - using physics, or by changing its position property directly (see my comment about mixing physics & manual node movement for important details).