moving paddles only pushing the puck, not hitting it - ios

Question

I am trying to move the paddle, if it hits the puck, the puck should move away. But the puck only move, more like the paddle is only pushing it.
Declaring paddle:
p1.fillColor = SKColor.blackColor()
p1.name = p1Name
p1.physicsBody = SKPhysicsBody(circleOfRadius: 30)
p1.physicsBody.restitution = 1.0
p1.physicsBody.angularDamping = 0.0
p1.physicsBody.allowsRotation = false
p1.physicsBody.dynamic = true
p1.physicsBody.categoryBitMask = p1Category
p1.physicsBody.collisionBitMask = wallCategory | pCategory
p1.physicsBody.contactTestBitMask = pCategory
p1.position = CGPointMake(self.frame.width/2, self.frame.height/4)
self.addChild(p1)
Delcaring puck:
puck.fillColor = SKColor.redColor()
puck.name = pName
puck.physicsBody = SKPhysicsBody(circleOfRadius: 25)
puck.physicsBody.restitution = 0.8
puck.physicsBody.angularDamping = 0.5
puck.physicsBody.linearDamping = 0.5
puck.physicsBody.allowsRotation = false
puck.physicsBody.usesPreciseCollisionDetection = true
puck.physicsBody.friction = 0.0
puck.physicsBody.dynamic = true
puck.physicsBody.categoryBitMask = pCategory
puck.physicsBody.collisionBitMask = wallCategory | p1Category
puck.physicsBody.contactTestBitMask = p1Category
puck.position = CGPointMake(self.frame.width/2, self.frame.height/2)
self.addChild(puck)
How i move the paddle:
override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
/* Called when a touch begins */
for touch: AnyObject in touches {
let location = touch.locationInNode(self)
let body: SKPhysicsBody = self.nodeAtPoint(location).physicsBody
if (body.node.name == self.p1Name) {
self.fingerOnP1 = true
self.p1.physicsBody.collisionBitMask = wallCategory
}
}
}
override func touchesMoved(touches: NSSet, withEvent event: UIEvent) {
for touch: AnyObject in touches {
let location = touch.locationInNode(self)
let previousLocation = touch.previousLocationInNode(self)
let body = self.nodeAtPoint(location).physicsBody
if (body != nil && body.node != nil) {
if (body.node.name == self.p1Name && self.fingerOnP1 == true) {
let paddle = self.childNodeWithName(p1Name) as SKShapeNode
var paddleX: Int = Int(paddle.position.x) + Int(location.x - previousLocation.x)
let _x: Int = Int(paddle.frame.width/2)
paddleX = max(paddleX, _x)
paddleX = min(paddleX, Int(self.size.width)-_x)
var paddleY: Int = Int(paddle.position.y) + Int(location.y - previousLocation.y)
let _y: Int = Int(paddle.frame.height/2)
paddleY = max(paddleY, _y)
paddleY = min(paddleY, Int(self.size.height)-_y)
paddle.position = CGPointMake(CGFloat(paddleX), CGFloat(paddleY))
}
}
}
}
override func touchesEnded(touches: NSSet, withEvent event: UIEvent) {
var onP1 = false
for touch: AnyObject in touches {
let location = touch.locationInNode(self)
if (self.nodeAtPoint(location) == p1) {
onP1 = true
}
}
if (onP1 == true) {
self.fingerOnP1 == false
self.p1.physicsBody.collisionBitMask = wallCategory | pCategory
}
}
I guess the problem is I'm not applying any force to the paddle, I'm just moving the paddle, too. How would I apply force while moving it?
I thought of apply impulse to the puck after contact, but i have no idea how to move it a proper angle or make it move at a proper speed.
func didBeginContact(contact: SKPhysicsContact) {
var firstBody: SKPhysicsBody!
var secondBody: SKPhysicsBody!
if (contact.bodyA.categoryBitMask > contact.bodyB.categoryBitMask) {
firstBody = contact.bodyA
secondBody = contact.bodyB
}
else {
firstBody = contact.bodyB
secondBody = contact.bodyA
}
if (firstBody.categoryBitMask == p1Category && secondBody.categoryBitMask == pCategory) {
if (self.fingerOnP1) {
NSLog("hit", nil)
secondBody.applyImpulse(CGVectorMake(20, 0))
}
}
}