(Swift SpriteKit) Rotate sprite in the direction of touch

Question

On the screenshot provided, the red arrow and cross are just for demonstration purposes and are not in the game. I would like the sprite of the spaceship to face the direction o

Answer 1

I had been working some time ago in something like what you want so, here is my results

first you need to use VectorMath.swift created by Nick Lockwood and this is my code to make my spider move towards user touch

import SpriteKit
import SceneKit

class GameScene: SKScene {
    let sprite = SKSpriteNode(imageNamed:"Aranna")
    var velocity = Vector2(x: 0, y: 0)
    var positionV2D = Vector2(x: 0, y: 0)
    var headingVector = Vector2(x: 0, y: 1)

    override func didMoveToView(view: SKView) {
        /* Setup your scene here */
        let myLabel = SKLabelNode(fontNamed:"Chalkduster")
        myLabel.text = "Hello, World!";
        myLabel.fontSize = 45;
        myLabel.position = CGPoint(x:CGRectGetMidX(self.frame), y:CGRectGetMidY(self.frame));

        sprite.position = CGPoint(x:CGRectGetMidX(self.frame), y:CGRectGetMidY(self.frame));
        positionV2D = Vector2(point:sprite.position);

        let testVector = Vector2(x: 10, y: 14);
        velocity += testVector;
        print(velocity.toString());
        velocity += Vector2(x: 1, y: 1);
        //velocity = velocity + testVector;
        print(velocity.toString());
        velocity *= 0.5;
        velocity.printVector2D();

        velocity = Vector2(x: 2, y: 2);
        velocity.normalized();
        velocity.printVector2D();

        self.addChild(sprite)
    }


    func ToRad(grados:CGFloat) ->CGFloat
    {
        return ((CGFloat(M_PI) * grados) / 180.0)
    }

    func ToDeg(rad:CGFloat) ->CGFloat
    {
        return (180.0 * rad / CGFloat(M_PI))
    }

    override func touchesBegan(touches: Set, withEvent event: UIEvent?) {
       /* Called when a touch begins */

        for touch in touches {
            let location = touch.locationInNode(self)

            let toTarget = Vec2DNormalize(Vector2(point:location) - positionV2D);


            let angle2 = headingVector.angleWith(toTarget);

            print(ToDeg(CGFloat(angle2)));

            headingVector.printVector2D();

            self.sprite.runAction(SKAction.rotateToAngle(CGFloat(angle2), duration: 0.1))
            self.sprite.runAction(SKAction.moveTo(location, duration: 0.5))
            positionV2D = Vector2(point: location);

        }
    }

    override func update(currentTime: CFTimeInterval) {
        /* Called before each frame is rendered */
    }
}

I hope this helps you