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BattleBats SpriteKit Game Guide
- 1. BattleBats: A SpriteKit Game Michael Burks michael@radtastical.com
- 2. 1. BattleBats 2. SpriteKit Overview 3. Pros & Cons 4. Performance Tips Michael Burks michael@radtastical.com
- 3. BattleBats • From concept to app in 8 weeks • Multiplayer version of a classic arcade game • includes an editor for users to create and share their own levels • made entirely with SpriteKit! Michael Burks michael@radtastical.com
- 5. SpriteKit Basics • SKView presents SKScene • SKScene contains SKNodes Michael Burks michael@radtastical.com
- 7. SKActions • are performed by SKNodes • can do geometric transformations on SKNodes • can modify attributes of SKNodes • can play sounds • can run custom blocks • can be combined into groups, sequences, and repetitions Michael Burks michael@radtastical.com
- 8. Physics! • SKScene has an SKPhysicsWorld • SKNodes can have SKPhysicsBodies • SKPhysicsJoints can connect SKPhysicsBodies Michael Burks michael@radtastical.com
- 9. SKPhysicsWorld • controls (constant linear) gravity • has methods to find SKPhysicsBodies at a point, in a rect, or along a ray • sends its delegate didBeginContact: and didEndContact: methods Michael Burks michael@radtastical.com
- 10. SKPhysicsBody • is created with a shape • has area, mass, density • has friction, restitution, damping • has velocity, angular velocity • has bit masks for contact and collision categories • has methods to apply forces, impulses, and torques Michael Burks michael@radtastical.com
- 11. SKPhysicsJoint • SKPhysicsJointFixed • SKPhysicsJointPin • SKPhysicsJointSliding • SKPhysicsJointLimit • SKPhysicsJointSpring Michael Burks michael@radtastical.com
- 12. SpriteKit Run Cycle • The scene calls its update: method. • The scene executes actions on its children, then calls its didEvaluateActions method. • The SKPhysicsContactDelegate methods didBeginContact: and didEndContact: are called if appropriate. • The scene executes physics simulation on its physics bodies, then calls its didSimulatePhysics method. Michael Burks michael@radtastical.com
- 13. Pros & Cons Michael Burks michael@radtastical.com
- 14. Pros • It’s easy and fun! You can quickly turn a concept into a prototype. • It has everything you need - animation, physics, and collision detection. • It looks good and works well. Michael Burks michael@radtastical.com
- 15. Cons • SKNodes are subclasses of UIResponder, not UIView. No gesture recognizers or UIControls in an SKScene or SKNode. • The background color of an SKScene is opaque. • SKLabelNodes only display a single line of text. • No built-in system for Newtonian inversesquare gravity. Michael Burks michael@radtastical.com
- 16. Cons • Running SKActions on SKNodes that are already running SKActions can lead to unexpected results. • Elastic collisions aren’t always elastic. • No visualization of SKPhysicsJoints. • No simple way to set the equilibrium length of SKPhysicsJointSpring. • Changing the position of an SKNode doesn’t always register immediately with its associated SKPhysicsJoints. Michael Burks michael@radtastical.com
- 17. But hey... Michael Burks michael@radtastical.com
- 18. Tips 1. Use SKSpriteNodes! • Apple has done the most to optimize these. • They are MUCH faster than SKShapeNodes. Michael Burks michael@radtastical.com
- 19. Tips 2. Use the zPosition property to order SKNodes! • This helps you keep track of where SKNodes lie in the scene relative to each other. • This can also help the SKView optimize drawing. Set the ignoresSiblingOrder property of the SKView to YES (new to beta 6). Michael Burks michael@radtastical.com
- 20. Go make SpriteKit apps! ! ! (if I can do it, you probably can too) Michael Burks michael@radtastical.com