CODEWITHSUNDEEP
iosswift3xcode8game-physics
Haris Sandhu
Haris Sandhu

Reputation: 15

Swift PhysicsBody not affected by Impulse

this is my first post here and i am new to iOS programming. I am using Xcode 8 and Swift 3 to build my practice game. All i want is i want to jump the ball when the screen is tapped but the impulse is not working. Here is the code i have written.

class GameScene: SKScene {
var footBall = SKSpriteNode(imageNamed: "sfb")
var Score = 0
var GameStarted = false


override func didMove(to view: SKView) {
    self.removeAllChildren()
    self.anchorPoint = CGPoint(x: 0.0, y: 0.0)

    footBall.size = CGSize(width: 100, height: 100)
    footBall.position = CGPoint(x: self.frame.width / 2, y: self.frame.height / 2)
    footBall.physicsBody = SKPhysicsBody(circleOfRadius: footBall.frame.height / 2)
    footBall.physicsBody?.affectedByGravity = false
    footBall.physicsBody?.allowsRotation = true
    footBall.physicsBody?.isDynamic = true
    self.addChild(footBall)
}


override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
    if(GameStarted == false){
        GameStarted = true
        footBall.physicsBody?.affectedByGravity = true
        footBall.physicsBody?.velocity = CGVector(dx: 0, dy: 0)
        footBall.physicsBody?.applyImpulse(CGVector(dx: 0, dy: 90))
    }
    else{
        footBall.physicsBody?.velocity = CGVector(dx: 0, dy: 0)
        footBall.physicsBody?.applyForce(CGVector(dx: 0, dy: 90))
    }
}

override func update(_ currentTime: TimeInterval) {

}

When clicked the velocity of the ball becomes zero for a moment but the impulse should drive it up which is not happening. Please help me through this and ignore any ignorance because this is my first question and i am new to this.

Upvotes: 1

Views: 184

Answers (1)

OldManMcDonalds
OldManMcDonalds

Reputation: 1167

Please note that in the true branch you are applying a force, not an impulse.

Change:

footBall.physicsBody?.applyForce(CGVector(dx: 0, dy: 90))

to

footBall.physicsBody?.applyImpulse(CGVector(dx: 0, dy: 90))

Don't understand why you always zero the velocity either.

Upvotes: 1

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