CODEWITHSUNDEEP
iosswift
Benjamin Novotney
Benjamin Novotney

Reputation: 9

How to detect when an SKSpriteNode hits another SKSpriteNode?

I'm trying to make a game where you tilt your phone and try to keep the ball inside the boundary. I can't seem to figure out how to make the ball not go through the boundary. I have the tilt to move the ball working, but it just goes through all my boundaries and I can't seem to figure out how to make the ball stop when it comes in contact with a boundary. Here is my code:

 override func didMove(to view: SKView) {
        let border = SKPhysicsBody(edgeLoopFrom: self.frame)
        self.physicsBody = border

        boundary = (self.childNode(withName: "boundry") as! SKSpriteNode) //the boundary is spelled wrong

        airplane = SKSpriteNode(imageNamed: "ball image")
        airplane.physicsBody = SKPhysicsBody(circleOfRadius: 10)
        airplane.position = CGPoint(x: -211.163, y: 367.3)
        airplane.size =  CGSize(width: 50, height: 50)
        airplane.physicsBody?.isDynamic = true
        airplane.physicsBody?.affectedByGravity = false
        airplane.physicsBody?.allowsRotation = true
        airplane.physicsBody?.pinned = false

        self.addChild(airplane)

        if motionManager.isAccelerometerAvailable {
            // 2
            motionManager.accelerometerUpdateInterval = 0.01
            motionManager.startAccelerometerUpdates(to: .main) {
                (data, error) in
                guard let data = data, error == nil else {
                    return
                }

                // 3
                let currentX = self.airplane.position.x
                self.destX = currentX + CGFloat(data.acceleration.x * 500)
                let currentY = self.airplane.position.y
                self.destY = currentY + CGFloat(data.acceleration.y * 500)
            }
        }
    }

    override func update(_ currentTime: TimeInterval) {

        let action = SKAction.moveTo(x: destX, duration: 1)
        let action2 = SKAction.moveTo(y: destY, duration: 1)
        airplane.run(action)
        airplane.run(action2)
    }

Upvotes: 0

Views: 42

Answers (2)

E.Coms
E.Coms

Reputation: 11537

Another thing is that you may need to add a distance constraint to airplane so that it cannot escape from the border if speed is too high.

Upvotes: 0

Josh Homann
Josh Homann

Reputation: 16347

In SpriteKit things don't collide unless you give them a set of matching collisionBitMask. ie border.collisionBitMask & airplane.collisionBitMask need to have at least one non zero bit in common. Try setting both to 1 to begin with.

Upvotes: 1

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