CODEWITHSUNDEEP
iosswiftsprite-kitskphysicsbodyskscene
Ali
Ali

Reputation: 3

Collision between two objects

I have created a simple project but I have a problem in the collisions.

It's simple (ball moving and vertical line) but didn't figure out how to stop the ball if it is touched the line.

import SpriteKit

class GameScene: SKScene,SKPhysicsContactDelegate {

var rPipe = SKSpriteNode() // Left Pipe
var ball1 = SKSpriteNode() // Ball

enum ColliderType:UInt32 {

case Ball1 = 1
case Pipe = 2

}

override func didMoveToView(view: SKView) {

    self.physicsWorld.contactDelegate = self

    // Pipe
    let rPipeTexture = SKTexture(imageNamed: "pipe_r.png")
    rPipe = SKSpriteNode(texture: rPipeTexture)
    rPipe.position = CGPoint(x: CGRectGetMaxX(self.frame)-50, y: CGRectGetMidY(self.frame)-30)
    rPipe.physicsBody = SKPhysicsBody(rectangleOfSize: rPipeTexture.size())
    rPipe.physicsBody?.dynamic = false
    rPipe.physicsBody?.categoryBitMask = ColliderType.Pipe.rawValue
    rPipe.physicsBody?.contactTestBitMask = ColliderType.Pipe.rawValue
    rPipe.physicsBody?.collisionBitMask = ColliderType.Pipe.rawValue
    self.addChild(rPipe)

    // Ball
    let ballTexture = SKTexture(imageNamed: "gBall.png")
    ball1 = SKSpriteNode(texture: ballTexture)
    ball1.position = CGPoint(x: CGRectGetMinX(self.frame)+675, y: CGRectGetMaxY(self.frame)-220)
    ball1.physicsBody = SKPhysicsBody(circleOfRadius: ballTexture.size().height/2)
    ball1.physicsBody?.dynamic = false
    ball1.physicsBody?.categoryBitMask = ColliderType.Ball1.rawValue
    ball1.physicsBody?.contactTestBitMask = ColliderType.Pipe.rawValue
    ball1.physicsBody?.collisionBitMask = ColliderType.Pipe.rawValue
    self.addChild(ball1)

}


override func touchesMoved(touches: Set<UITouch>, withEvent event: UIEvent?) {

    for touch in (touches ) {

        let location = touch.locationInNode(self)
            if ball1.containsPoint(location) {
                ball1.position.x = location.x
            }
        }
}

func didBeginContact(contact: SKPhysicsContact) {

    print("Contact")

}

Upvotes: 0

Views: 106

Answers (1)

WangYudong
WangYudong

Reputation: 4413

One of your collided objects's dynamic property should be set to true. Otherwise the collision will be ignored. After setting dynamic, you also need to set affectedByGravity to false because the ball should not be affected by the gravity.

ball1.physicsBody?.dynamic = true
ball1.physicsBody?.affectedByGravity = false

Upvotes: 0

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