SpriteKit with Swift workshop

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Getting real with SK in Swift Please download the start project from www.spritekit101.info now!

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Marin Todorov Author at raywenderlich.com, iOS consultant www.touch-code-magazine.com

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iOS Games by Tutorials The ﬁrst book on  game development with Swift ! ! www.ios-games-by-tutorials.com

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Game workshop in Swift • SpriteKit had huge revamp in iOS8! • Completely in Swift • New Xcode ver. 6 • New power tools

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almost • Xcode 6 • Scene editor • Effects / lighting • Swift

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AlienAttack • iOS8 / SpriteKit • Swift

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The Plan Introduction ~ 15min Save 1 Tasks #1/2 ~ 10min Save 2 Task #3 ~ 10 min Save 5 Goes on … [ 15 min Break ] www.spritekit101.info

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Epic loot www.spritekit101.info

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Introduction ~ 15 min

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SpriteKit project • SpriteKit.framework • integrated • built-in UIKit app (nav. controller, etc) view controller SKView

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Scenes + +

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Scene editor • Xcode 6 built-in • add objects • edit their properties

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Sprites position size opacity zRotation scale children

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Demo

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Save #1

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Task #1 Make chicken #2 eat Continue from Save #1 ~ 5 min

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• Duplicate the code to connect chicken2 to the scene sprite! • Duplicate the code to create the frame animation! • Run the animation on chicken2! • [⚛] Play with timerPerFrame and repeat ~5 min

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Task #2 Add two more labels ~ 5 min

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• Duplicate the create and conﬁgure code from waveLabel to scoreLabel! ! ! ! ! ! ! • [⚛] Play with zRotation ~5 min waveLabel ~> scoreLabel ammoLabel string “Score: \(score)” “Ammo: \(ammoCount)” h. alignment .Center .Right position.x frame.size.width/2.0 frame.size.width - 40.0

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Save #2

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Task #3 Create an enemy ~ 10 min Continue from Save #2

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• create new method spawnEnemy() and call it from didMoveToView()! • startPt=x: CGFloat.random(min:0, max: frame.size.width), y: frame.size.height! • fallPt = x: startPt.x, y: 160.0! • enemy = SKSpriteNode(imageNamed: “mwd1”)! • position = startPt, name = “enemy”, setScale(0.2)! • load and run frame animation on enemy with name ”mwd” and 9 steps          ! • create and run scale animation on enemy: SKAction.scaleTo(2.0, duration: 7.0)! • create and run move animation: SKAction.moveTo(fallPt, duration: 5.0) ~10 min

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Save #3

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Task #4 Make the enemy run ~ 10 min Continue from Save #3

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• create an action sequence with     three move actions and run it on    enemy! • replace move animation from prev. task with the new action sequence! • replace walking frame animation with running frame animation: ~8 min fallPt walkPt runPt (startPt.x, 160.0) (startPt.x, 120.0) (startPt.x, 40.0)

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Save #4

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Task #5 Add Explosions ~ 8 min Continue from Save #4

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• make new method: takeHit(enemy: SKSpriteNode)! • call removeFromParent() on the passed parameter! • create explostion by calling timedEmitter(“spark”, emitTime: 0.1, totalTime:     2.0)! • set the exposition’s position to the enemy’s position! ! • back in spawEnemy(), add one more action to the action sequence:! ! ! ! • [⚛] Play with explosion.particleSpeed = [25 … 250] ~8 min

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Task #6 Flash screen ~ 8 min

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• make new method: ﬂash()! • create new SKSpriteNode(), set its position and size from bgNode! • set its color to: SKColor.redColor().colorWithAlphaComponent(0.5)! • add it to the scene ( via addChild )! • run this sequence on the node:! ! ! ! • call ﬂash() from takeHit() ~6 min

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Task #7 Make some noise! ~ 5 min

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• in your scene class preload the explosion sound action:! ! ! ! • at the bottom of takeHit() play the explosion sound:

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Save #5

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Break #1 Keep it tight please! 15 min

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Save #6

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Task #8 Handle touches to shoot rocket ~ 5 min Continue from Save #6

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! • make new method shoot(pt: CGPoint)! • print the pt param in shoot’s body! ! • override touchesEnded(touches:, event:)! • get one touch:! ! ! • ﬁnally call shoot() and pass the touch location point ~10 min

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Task #9 Launch rocket! ~ 10 min

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• inside the shoot() method:! • 1) if ammoCount < 1 return; 2) set ammoCount-1; 3) update ammoLabel.text! • set rocket’s zRotation to (pt - rocket.position).angle    set emissionAngle to (rocket.position - pt).angle! • run scale action to 0.75 scale on rocket for 1 second! • run the following actions sequence on rocket:! ! ! ! • moveTo pt over duration of 1 second runBlock 1) create explosion at the position of rocket 2) if ammoCount > 0 call showRocket() removeFromParent ~10 min

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Save #7

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Task #10 Create physics bodies ~ 8 min Continue from Save #7

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• in spawnEnemy(), create a body for the enemy and set its category! ! ! ! • in showRocket(), create a body for the rocket, and set its contact category! ! ! • in GameViewController.viewDidLoad() : ~8 min

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Task #11 Detect contact ~ 10 min

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• make the scene class adhere to the SKPhysicsContactDelegate protocol! • in didMoveToView() set the contact delegate:     physicsWorld.contactDelegate = self! • create a new method: didBeginContact(contact: SKPhysicsContact)! • remove the hit enemy:! ! ! • set score to score + 1! • update scoreLabel with the new score ~10 min

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Save #8

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Break #2 Keep it tight please! 1 min 0

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Save #9

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Task #12 Detect when game is lost ~ 5 min Continue from Save #9

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• declare a new variable on the scene class, which is using dynamic dispatch:! ! ! • inside checkForCompletedLevel() check if health is less than 1! • if so set wavePaused to true, ﬁnished to “lost”, and return ~5 min

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Task #13 Show end game ~ 10 min

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• in GameViewController after you present the scene on screen,     start observing “ﬁnished”! ! ! • override observeValueForKeyPath(…) and inside add:! ! ! ! ! • ~10 min

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Task #14 Eﬀects! ~ 3 min

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• inside observeValueForKeyPath(…), after presenting the alert, add:! ! ! ! ! • ~3 min

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Save #10

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Task #15 Check for win! ~ 10 min

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• in the game scene class, inside checkForCompleteLevel():! ! ! ! ! • in GameViewController, inside observeValueForKeyPath():! ! ! ! • ~5 min

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Task #16 Integrate UIKit and SpriteKit ~ 10 min

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• in GameViewController add a gesture recognizer to the view:! ! ! ! ! ! ! • in GameScene add a new empty method swipe():! ! • ~10 min

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Save #11 The Complete project more sounds + swipe up superpower

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Demo

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Review • use SceneEditor (doh!) • create and run all kind of actions on sprites • effects for effect nodes • contact detection • game logic