Keep getting thread 1, can't rotate a ball in Swift - xcode

Question

I have tried many ways of writing the code to get it to rotate, but keep getting threads.
First way:
import UIKit
import SpriteKit
class PlayScene: SKScene {
let hero = SKSpriteNode(imageNamed: "hero.png")
let groundSpeed = 5
override func didMoveToView(view: SKView) {
// code
}
override func update(currentTime: NSTimeInterval) {
//rotate the hero (in shape of a ball)
let rotateAction = SKAction.rotateByAngle(5, duration: 1)
let repeatAction = SKAction.repeatActionForever(rotateAction)
hero.runAction(repeatAction)
}
}
Second way:
var degreeRotation = CDouble(self.groundSpeed) * M_PI / 180
//rotate the hero
self.hero.zRotation -= CGFloat(degreeRotation)
I have tried making an Int extension for degree to radians translation (like someone already suggested on Stackoverflow) but for some reason none of them worked. I am very new to Swift and I don't know what to try anymore, so if you can help me, please do.

Answer 1

Change your code to this...
import UIKit
import SpriteKit
class PlayScene: SKScene {
let hero = SKSpriteNode(imageNamed: "hero.png")
let groundSpeed = 5
override func didMoveToView(view: SKView) {
// code to add the hero sprite to the view.
// if the sprite is not added to the view then nothing will happen with actions.
// M_PI = half a turn. Work in radians, not degrees.
let rotateAction = SKAction.rotateByAngle((CGFloat)M_PI, duration: (NSTimeInterval)1)
let repeatAction = SKAction.repeatActionForever(rotateAction)
hero.runAction(repeatAction)
}
}