Rotate sprite with path - sprite-kit

Question

Hi i have a sprite following a path that is a bezier curve and id like the sprite to rotate to the direction it is currently moving, i can tell it to follow the path by setting orientToPath to YES in
SKaction *enemyCurve = [SKAction followpath:cgpath asOffset:NO orientToPath:YES duration:5];
but this just results in the sprite facing the final point of movement. Any suggestions on how i can make it rotate to the current direction its traveling in?
I have included the code i use for the path below. Thank you for any help and suggestions.
-(void)AddEnemy:(MotionType *)motion :(CGPoint*)Start :(CGPoint*)Finish :(EnemyType)enemyType{
double curTime = CACurrentMediaTime();
if (enemyType == One) {
if(curTime > _nextAsteroidspawn)
{
float randSecs = [self randomValueBetween:0.20 andValue:1.0];
_nextAsteroidspawn = randSecs + curTime;
float randY = [self randomValueBetween:0.0 andValue:self.frame.size.height];
float randDuration = [self randomValueBetween:2.0 andValue:10.0];
SKSpriteNode *asteroid = [_Asteroids objectAtIndex:_nextAsteroid];
_nextAsteroid++;
if(_nextAsteroid >= _Asteroids.count){
_nextAsteroid = 0;
}
[asteroid removeAllActions];
asteroid.position = CGPointMake(self.frame.size.width+asteroid.size.width/2, 50);
asteroid.hidden = NO;
CGMutablePathRef cgpath = CGPathCreateMutable();
CGPoint startingPoint = CGPointMake(self.frame.size.width+asteroid.size.width/2 , 50);
CGPoint controlPoint1 = CGPointMake(160, 300);
CGPoint controlPoint2 = CGPointMake(200, 600);
CGPoint endingPoint = CGPointMake(0, self.frame.size.width - self.frame.size.width - asteroid.size.width / 2);
CGPathMoveToPoint(cgpath, NULL, startingPoint.x, startingPoint.y);
CGPathAddCurveToPoint(cgpath, NULL, controlPoint1.x, controlPoint1.y, controlPoint2.x
, controlPoint2.y, endingPoint.x
, endingPoint.y);
SKAction *enemyCurve = [SKAction followPath:cgpath asOffset:NO orientToPath:YES duration:5];
CGPoint location = CGPointMake(-self.frame.size.width-asteroid.size.width, randY);
SKAction *moveAction = [SKAction moveTo:location duration:randDuration];
SKAction *doneAction = [SKAction runBlock:(dispatch_block_t)^(){
asteroid.hidden = YES;
}];
SKAction *moveAsteroidActionWithDone = [SKAction sequence:#[enemyCurve,moveAction, doneAction]];
[asteroid runAction:moveAsteroidActionWithDone withKey:#"asteroidMoving"];
CGPathRelease(cgpath);
//[asteroid runAction: [SKAction repeatActionForever:[SKAction animateWithTextures:_Asteroids timePerFrame:0.1f]]];
}
The code that creates the enemy node can be seen bellow, i do not apply any rotations to the node.
In initWithSize:
_Asteroids = [[NSMutableArray alloc] initWithCapacity:knumAsteroids];
for(int i = 0; i < knumAsteroids; i++)
{
SKSpriteNode *asteroid = [SKSpriteNode spriteNodeWithImageNamed:#"enemyBasic1"];
asteroid.hidden = YES;
[_Asteroids addObject:asteroid];
[self addChild:asteroid];
}
In Update:
[self AddEnemy:BezierCurve :NULL :NULL:One];
The method in update just links to the code posted at the top which determines the path the enemy will take i have also updated it to include the entire method.