Is there a way to apply sound effects to collisions? - swift

Question

It's my first project with Swift and I'm trying to learn, but I'm stuck and can't find a solution online. Basically, it's a clone of pong, and everything is going good, until now.
My problem it's that I can't understand how to make a sound effect play, once my ball hit the paddles.
Everything else with the collisions is ok, and other sound like the goal one is playing fine. Just can't figure out how i can make a sound play when the two sprites collide.
Here's what I've written:
func didBegin(_ contact: SKPhysicsContact) {
if contact.bodyA.node?.name == "main" && contact.bodyB.node?.name == "ball" || contact.bodyB.node?.name == "main" && contact.bodyA.node?.name == "ball" || contact.bodyA.node?.name == "enemy" && contact.bodyB.node?.name == "ball" || contact.bodyB.node?.name == "enemy" && contact.bodyA.node?.name == "ball" {
ball.run(blipPaddleSound)
}
}
It's all wrong?
I’ve already tried to break the if statement, and already tried with make one of my node run the sound effect (ball.run(‘nameofthesound’). I’ve thought maybe it could be a problem with the file, but other effect don’t play as well in that part of the code. I don’t think there is a problem with the collision, because the ball bounce on the paddle and on the wall without problem
This is the part of the code where I have put all the collision and contact mask:
ball.physicsBody?.contactTestBitMask = 1
ball.physicsBody?.collisionBitMask = 3
ball.physicsBody?.categoryBitMask = 1
main.physicsBody?.contactTestBitMask = 3
main.physicsBody?.collisionBitMask = 1
main.physicsBody?.categoryBitMask = 2
enemy.physicsBody?.contactTestBitMask = 3
enemy.physicsBody?.collisionBitMask = 1
enemy.physicsBody?.categoryBitMask = 2

Answer 1

Most likely you are not setting the SKPhysicsContactDelegate to the Scene
You'll also find that a single collision can fire multiple triggers within the game cycle so you may want to put a variable controlling the sound play so that it doesn't play multiple times per collision
class GameScene: SKScene, SKPhysicsContactDelegate {
private var didCollide = false
func didBegin(_ contact: SKPhysicsContact) {
let object1 = contact.bodyA.node?.name
let object2 = contact.bodyB.node?.name
if object1 == "ball" || object2 == "ball" {
if object1 == "main" || object2 == "main" || object1 == "enemy"|| object2 == "enemy" {
//check if we have just collided within the last 0.3 seconds
if !didCollide {
//set the marker to true so that the sound doesn't repeatedly fire
didCollide = true
//play the sound
ball.run(blipPaddleSound)
//wait 0.3 seconds (give the ball a chance to move away from the object)
self.run(.wait(forDuration: 0.3) {
self.didCollide = false
}
}
}
}
}
}