CODEWITHSUNDEEP
swiftsprite-kit
Lahav
Lahav

Reputation: 791

didBeginContact not working properly

I created a struct PhysicsCatagory for each of the different objects I want interacting with each other

struct PhysicsCatagory {
    static let Blade : UInt32 = 1
    static let Laser : UInt32 = 2

}

above my class GameScene

 class GameScene: SKScene, SKPhysicsContactDelegate {

and I initialized an SKSpriteNode blade with its physicsBody in the didMoveToView method

override func didMoveToView(view: SKView) {
    physicsWorld.contactDelegate = self
    Blade.position = CGPointMake(self.size.width / 2, (self.size.height / 14))
    Blade.anchorPoint = CGPointMake(0.5, -0.13)
    Blade.physicsBody = SKPhysicsBody(rectangleOfSize: Blade.size)
    Blade.physicsBody?.categoryBitMask = PhysicsCatagory.Blade
    Blade.physicsBody?.contactTestBitMask = PhysicsCatagory.Laser
    Blade.physicsBody?.dynamic = false

    self.addChild(Blade)
}

As well as a SKSpriteNode laser and its physicsbody in the method shootLaser

func shootLaser(){
    var Laser = SKSpriteNode(imageNamed: "Laser.png")
    Laser.position = Enemy.position
    Laser.zPosition = -5
    Laser.physicsBody = SKPhysicsBody(rectangleOfSize: Laser.size)
    Laser.physicsBody?.categoryBitMask = PhysicsCatagory.Laser
    Laser.physicsBody?.contactTestBitMask = PhysicsCatagory.Blade
    Laser.physicsBody?.dynamic = false

    let action = SKAction.moveBy(laserVector, duration: 0.7)
    let actionDone = SKAction.removeFromParent()
    Laser.runAction(SKAction.sequence([action,actionDone]))
    self.addChild(Laser)
}

But when they collide in the simulation, the didBeginContact method is not called and "Hello" is not printed

func didBeginContact(contact: SKPhysicsContact) {
NSLog("Hello")
}

Why isn't the didBeginContact method being called when they collide? Thanks in advance (:

Upvotes: 2

Views: 339

Answers (1)

0x141E
0x141E

Reputation: 12753

Sprite Kit does not check for contacts between non-dynamic physics bodies because they aren't expected to move. If you don't want your sprites to fall off the screen due to gravity, set the physics body's affectedByGravity property to false and set dynamic = true.

Upvotes: 3

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