I'm creating a RPGGameKit using SpriteKit to help me develop my iOS games. Now that my player can move, I added animations and an audio system.
I ran on a problem to synchronize textures and sounds. Like a step when my player walk.
let atlas = SKTextureAtlas(named: "Walk")
let textures = atlas.getTextures() // I created an extension that returns textures of atlas
let walkingAnimation = SKAction.animate(with: textures, timePerFrame: 1)
So, walkingAnimation will loop through textures and change it every 1 second.
Now, I want to play a walking sound when the texture changes.
I have look at SKAction and SpriteKit documentation but there is no callback for this SKAction.
If you want to try to get this done with me or you have ideas of how to do it, please leave a comment.
Thanks :)
Try this:
let frame1 = SKAction.setTexture(yourTexture1)
let frame2 = SKAction.setTexture(yourTexture2)
let frame3 = SKAction.setTexture(yourTexture3)
//etc
let sound = SKAction.playSoundFileNamed("soundName", waitForCompletion: false)
let oneSecond = SKAction.wait(forDuration: 1)
let sequence = SKAction.sequence([frame1,sound,oneSecond,frame2,sound,oneSecond,frame3,sound,oneSecond])
node.run(sequence)
So, for now I'm going to do it like this :
let textures = SKTextureAtlas(named: "LeftStep").getTextures()
var actions = [SKAction]()
for texture in textures {
let group = SKAction.group([
SKAction.setTexture(texture),
SKAction.playSoundFileNamed("Step.mp3", waitForCompletion: false)
])
let sequence = SKAction.sequence([
group,
SKAction.wait(forDuration: 0.5)
])
actions.append(sequence)
}
self.node.run(SKAction.repeatForever(SKAction.sequence(actions)))
Thanks #StefanOvomate
I've found myself in the same situation, currently I'm doing the below. From what I have read in the documentation and seen online, the only way to do it is to create the audio file length to match one rotation of the texture animation.
let walkAtlas = global.playerWalkAtlas
var walkFrames: [SKTexture] = []
let numImages = walkAtlas.textureNames.count
for i in 1...numImages {
let texture = "walk\(i)"
walkFrames.append(walkAtlas.textureNamed(texture))
}
walking = walkFrames
isWalking = true
animateMove()
}
func animateMove(){
let animateWalk = SKAction.animate(with: walking, timePerFrame: 0.05)
let soundWalk = global.playSound(sound: .walkSound)
let sequence = SKAction.sequence([soundWalk, animateWalk])
self.run(SKAction.repeatForever(sequence),withKey: "isMoving")
}
func stopMoving(){
self.removeAction(forKey: "isMoving")
isWalking = false
}
I'm using the scene editor in SpriteKit to place color sprites and assign them textures using the Attributes Inspector. My problem is trying to figure out how to reference those sprites from my GameScene file. For example, I'd like to know when a sprite is a certain distance from my main character.
Edit - code added
I'm adding the code because for some reason, appzYourLife's answer worked great in a simple test project, but not in my code. I was able to use Ron Myschuk's answer which I also included in the code below for reference. (Though, as I look at it now I think the array of tuples was overkill on my part.) As you can see, I have a Satellite class with some simple animations. There's a LevelManager class that replaces the nodes from the scene editor with the correct objects. And finally, everything gets added to the world node in GameScene.swift.
Satellite Class
func spawn(parentNode:SKNode, position: CGPoint, size: CGSize = CGSize(width: 50, height: 50)) {
parentNode.addChild(self)
createAnimations()
self.size = size
self.position = position
self.name = "satellite"
self.runAction(satAnimation)
self.physicsBody = SKPhysicsBody(circleOfRadius: size.width / 2)
self.physicsBody?.affectedByGravity = false
self.physicsBody?.categoryBitMask = PhysicsCategory.satellite.rawValue
self.physicsBody?.contactTestBitMask = PhysicsCategory.laser.rawValue
self.physicsBody?.collisionBitMask = 0
}
func createAnimations() {
let flyFrames:[SKTexture] = [textureAtlas.textureNamed("sat1.png"),
textureAtlas.textureNamed("sat2.png")]
let flyAction = SKAction.animateWithTextures(flyFrames, timePerFrame: 0.14)
satAnimation = SKAction.repeatActionForever(flyAction)
let warningFrames:[SKTexture] = [textureAtlas.textureNamed("sat8.png"),
textureAtlas.textureNamed("sat1.png")]
let warningAction = SKAction.animateWithTextures(warningFrames, timePerFrame: 0.14)
warningAnimation = SKAction.repeatActionForever(warningAction)
}
func warning() {
self.runAction(warningAnimation)
}
Level Manager Class
import SpriteKit
class LevelManager
{
let levelNames:[String] = ["Level1"]
var levels:[SKNode] = []
init()
{
for levelFileName in levelNames {
let level = SKNode()
if let levelScene = SKScene(fileNamed: levelFileName) {
for node in levelScene.children {
switch node.name! {
case "satellite":
let satellite = Satellite()
satellite.spawn(level, position: node.position)
default: print("Name error: \(node.name)")
}
}
}
levels.append(level)
}
}
func addLevelsToWorld(world: SKNode)
{
for index in 0...levels.count - 1 {
levels[index].position = CGPoint(x: -2000, y: index * 1000)
world.addChild(levels[index])
}
}
}
GameScene.swift - didMoveToView
world = SKNode()
world.name = "world"
addChild(world)
physicsWorld.contactDelegate = self
levelManager.addLevelsToWorld(self.world)
levelManager.levels[0].position = CGPoint(x:0, y: 0)
//This does not find the satellite nodes
let satellites = children.flatMap { $0 as? Satellite }
//This does work
self.enumerateChildNodesWithName("//*") {
node, stop in
if (node.name == "satellite") {
self.satTuple.0 = node.position
self.satTuple.1 = (node as? SKSpriteNode)!
self.currentSatellite.append(self.satTuple)
}
}
The Obstacle class
First of all you should create an Obstacle class like this.
class Obstacle: SKSpriteNode { }
Now into the scene editor associate the Obstacle class to your obstacles images
The Player class
Do the same for Player, create a class
class Player: SKSpriteNode { }
and associate it to your player sprite.
Checking for collisions
Now into GameScene.swift change the updated method like this
override func update(currentTime: CFTimeInterval) {
/* Called before each frame is rendered */
let obstacles = children.flatMap { $0 as? Obstacle }
let player = childNodeWithName("player") as! Player
let obstacleNearSprite = obstacles.contains { (obstacle) -> Bool in
let distance = hypotf(Float(player.position.x) - Float(obstacle.position.x), Float(player.position.y) - Float(obstacle.position.y))
return distance < 100
}
if obstacleNearSprite {
print("Oh boy!")
}
}
What does it do?
The first line retrieves all your obstacles into the scene.
the second line retrieves the player (and does crash if it's not present).
Next it put into the obstacleNearSprite constant the true value if there is at least one Obstacle at no more then 100 points from Player.
And finally use the obstacleNearSprite to print something.
Optimizations
The updated method gets called 60 times per second. We put these 2 lines into it
let obstacles = children.flatMap { $0 as? Obstacle }
let player = childNodeWithName("player") as! Player
in order to retrieves the sprites we need. With the modern hardware it is not a problem but you should save references to Obstacle and Player instead then searching for them in every frame.
Build a nice game ;)
you will have to loop through the children of the scene and assign them to local objects to use in your code
assuming your objects in your SKS file were named Obstacle1, Obstacle2, Obstacle3
Once in local objects you can check and do whatever you want with them
let obstacle1 = SKSpriteNode()
let obstacle2 = SKSpriteNode()
let obstacle3 = SKSpriteNode()
let obstacle3Location = CGPointZero
func setUpScene() {
self.enumerateChildNodesWithName("//*") {
node, stop in
if (node.name == "Obstacle1") {
self.obstacle1 = node
}
else if (node.name == "Obstacle2") {
self.obstacle2 = node
}
else if (node.name == "Obstacle3") {
self.obstacle3Location = node.position
}
}
}
I am new to Swift but I am having trouble with classes and inheritance. I have a class called Bunny which holds some code including an SKAction. When I place the code found in Bunny into my GameScene class, it works fine, however, when I try running it, while it is in the Bunny class, from my GameScene class it does not work.
Here is the Bunny class:
import SpriteKit
class Bunny : SKSpriteNode {
var bunny = SKSpriteNode()
var moveAndRemove = SKAction()
var textureAtlas = SKTextureAtlas()
var textureArray = [SKTexture]()
func spawnBunnies() {
let spawn = SKAction.runBlock({
() in
self.spawnBunny()
print("CALLEDBunniesSpawned") // THIS PART IS NOT GETTING CALLED
})
let delay = SKAction.waitForDuration(3)
let spawnDelay = SKAction.sequence([spawn, delay])
let spawnDelayForever = SKAction.repeatActionForever(spawnDelay)
self.runAction(spawnDelayForever)
let distance = CGFloat(self.frame.width + bunny.frame.width)
let movePipes = SKAction.moveByX(-distance - 200, y: 0, duration: NSTimeInterval(0.009 * distance)) // Speed up pipes
let removePipes = SKAction.removeFromParent()
moveAndRemove = SKAction.sequence([movePipes, removePipes])
print("BunniesSpawned") // THIS PART HERE RUNS
}
func spawnBunny() { // I NEED TO TRIGGER THIS PART VIA THE SPAWN = SKAction.runBlock
print("BunniesSpawned2")
let randomYGen = CGFloat(arc4random_uniform(UInt32(self.frame.height - 80)))
textureAtlas = SKTextureAtlas(named: "Bunnies")
for i in 1...textureAtlas.textureNames.count {
var name = "Bunny\(i).png"
textureArray.append(SKTexture(imageNamed: name))
}
bunny = SKSpriteNode(imageNamed: textureAtlas.textureNames[5] as! String)
bunny.position = CGPoint(x: self.frame.width + bunny.frame.width / 2, y: randomYGen)
bunny.setScale(0.5)
bunny.runAction(moveAndRemove)
self.addChild(bunny)
bunny.runAction(SKAction.repeatActionForever(SKAction.animateWithTextures(textureArray, timePerFrame: 0.1)))
}
}
Here is my GameScene class where I am trying to call the function from Bunny:
override func touchesBegan(touches: Set<UITouch>, withEvent event: UIEvent?) {
/* Called when a touch begins */
if gameStarted == false {
gameStarted = true
var bun = Bunny()
bun.spawnBunnies()
} else {
}
As crashoverride777 said, the original Bunny you created in your touchesBegan is never added to the scene. If it is not part of a scene, it will never run any of the actions you are setting up.
var bun = Bunny()
self.addChild(bun)
bun.spawnBunnies()
Additionally, in spawnBunnies you are adding the newly spawned Bunny as a child of the Bunny that is spawning it. This bunny gets removed from the scene so the newly spawned bunny (which is it's child) also get's removed.
self.addChild(bunny) should be parent?.addChild(bunny). It might also need to be moved above the line bunny.runAction(moveAndRemove).
Unless I am missing something you are not adding the Bunny subclass to the scene.
Try this
var bun = Bunny()
addChild(bun)
bun.spawnBunnies()
Hey guys im having a huge problem with my Sprite Kit game. Im new to it and im trying to do a kind of asteroids game just to do exercise what i learnt.
My problem is, my asteroids are infinite, they don't stop unless the player is hit. My code is the follows:
For the meteor:
func addMeteor() {
let bigMeteor = SKSpriteNode(imageNamed: "meteor1")
let bigMeteorAux = bigMeteor
let sizeX = UInt32(CGRectGetMaxX(self.frame))
let randomX = CGFloat(arc4random_uniform(sizeX))
var impulse : CGVector!
bigMeteorAux.position = CGPoint(x: randomX, y: size.height + 100)
impulse = CGVector(dx: 0, dy: -30)
bigMeteorAux.physicsBody = SKPhysicsBody(texture: bigMeteor.texture, size: bigMeteor.size);
bigMeteor.physicsBody?.affectedByGravity = false
bigMeteor.physicsBody?.allowsRotation = false
bigMeteorAux.physicsBody?.friction = 0.0
bigMeteorAux.physicsBody!.categoryBitMask = CollisionCategoryAsteroids
bigMeteorAux.name = "Asteroid"
foregroundNode!.addChild(bigMeteorAux)
bigMeteorAux.physicsBody!.applyImpulse(impulse)
}
Im calling the function with an action:
runAction(SKAction.repeatActionForever(
SKAction.sequence([
SKAction.runBlock(addMeteor),
SKAction.waitForDuration(1.0)
])
))
Perfect until now, the game works just fine. This is the player code:
playerNode = SKSpriteNode(imageNamed: "spaceshipv2")
playerNode!.physicsBody = SKPhysicsBody(texture: playerNode!.texture, size: playerNode!.size);
playerNode!.xScale = 0.5
playerNode!.yScale = 0.5
playerNode!.position = CGPoint(x: size.width / 2.0, y: 220.0)
playerNode!.physicsBody!.linearDamping = 1.0
playerNode!.physicsBody!.allowsRotation = false
playerNode!.physicsBody?.affectedByGravity = false
playerNode!.physicsBody!.categoryBitMask = CollisionCategoryPlayer
playerNode!.physicsBody!.contactTestBitMask =
CollisionCategoryAsteroids
playerNode!.name = "Player"
//addChild(playerNode!)
foregroundNode!.addChild(playerNode!)
And for the last the contact func:
func didBeginContact(contact: SKPhysicsContact) {
var nodeB = contact.bodyB!.node!
if nodeB.name == "Asteroid" {
println("Touched")
nodeB.removeFromParent()
}
}
So my problem start with the nodeB, for some reason sometimes when the Asteroid hit the player this code works just fine but other times when the asteroid hit the player the game crashes and i get
fatal error: unexpectedly found nil while unwrapping an Optional value
After the program enters the contact function.
Any ideas or solution about how to fix this? Thx a lot! =)
The crash comes from one of the two forced unwrap calls: bodyB! and node!. By writing it like this, you are asserting that you are sure they will never be nil.
The way to find the case where one of these is nil, break up the code into lines that you can check with a breakpoint.
var bodyB = contact.bodyB
if bodyB == nil {
// breakpoint here
}
var nodeB = bodyB!.node
if nodeB == nil {
// breakpoint here
}
if nodeB!.name = "Asteroid" // etc.
Once the code stops you can examine the objects and try to find out why they are nil and fix the problem.
I'm not sure why the node is coming up nil, but you can avoid the crash by not force unwrapping the nil values:
if let nodeB = contact.bodyB?.node?
if nodeB.name == "Asteroid" {
println("Touched")
nodeB.removeFromParent()
}
}
Then that bit of code will only run if those optionals can be successfully unwrapped.
I have a SpriteKit game I am building and I am loading a level from a multidimensional array. The loadlevel function works the first time. It does fail if I do a println of the physicsBody above the physicsBody assignment (after the initialization of the physicBody). When I remove all the tiles with removeChildrenInArray the secondtime I run load level it throws an error saying fatal error: unexpectedly found nil while unwrapping an Optional and it points to line right below the println below. And the println indicates that it is the physicsBody that is nil. In my mind there is no reason a freshly initialize PhysicsBody should ever be nil. The println prints physicsBody nil. I have no idea why the physicsBody would be nil. I am just trying to reset the level by removing all block nodes and adding new ones in the original place according to the level map.
func loadLevel() {
var levels = Levels().data
var frameSize = view.frame.size
var thisLevel = levels[currentLevel]
println("running load level")
for (rowIndex,row) in enumerate(thisLevel) {
for (colIndex,col) in enumerate(row) {
if col == 4 {
continue
}
println("COL: \(col)")
var tile = SKSpriteNode(texture: SKTexture(imageNamed: "brick_\(tileMap[col])"))
tile.name = "tile_\(rowIndex)_\(colIndex)"
tile.position.y = frameSize.height - (tile.size.height * CGFloat(rowIndex)) - (tile.size.height/2)
tile.position.x = tile.size.width * CGFloat(colIndex) + (tile.size.width/2)
var physicsBody = SKPhysicsBody(rectangleOfSize: tile.size)
tile.physicsBody = physicsBody
tile.physicsBody.affectedByGravity = false
tile.physicsBody.categoryBitMask = ColliderType.Block.toRaw()
tile.physicsBody.contactTestBitMask = ColliderType.Ball.toRaw()
tile.physicsBody.collisionBitMask = ColliderType.Ball.toRaw()
scene.addChild(tile)
tileCount++
}
}
}
Here is my ColliderType
enum ColliderType:UInt32 {
case Paddle = 1
case Block = 2
case Wall = 3
case Ball = 4
}
This is my reset function contents:
func reset() {
tileCount = 0
var removeTiles = [SKSpriteNode]()
// remove all the tiles
for child in scene.children {
var a_tile = child as SKSpriteNode
if a_tile.name.hasPrefix("tile_") {
a_tile.removeFromParent()
a_tile.name = ""
removeTiles.append(a_tile)
}
}
removeTiles.removeAll(keepCapacity: false)
ball!.position = CGPoint(x: 200, y: 200)
ballVel = CGPoint(x: 0, y: -5)
currentLevel++
loadLevel()
lost = false
won = false
}
Here is my Level structs
struct Tile {
let map = ["blue","green","purple","red"]
}
struct Levels {
let data = [
[
[4,4,0,4,0,4,0,4,0,4,0,4,0,0,4,4],
[4,4,1,4,1,4,1,4,1,4,1,4,1,1,4,4],
[4,4,2,4,2,4,2,4,2,4,2,4,2,2,4,4],
[4,4,3,4,3,4,3,4,3,4,3,4,3,3,4,4]
],
[
[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
[1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1],
[2,2,2,2,2,2,2,4,2,2,2,2,2,2,2,2],
[3,3,3,3,3,3,3,3,3,3,3,3,3,3,3,3]
]
]
}
If this is a bug in Swift I am trying to figure out a way around so I can just make this work.
Looks like SKPhysicsBody is instantiated with an empty size. Try to create the physics body object with an explicit size, like so:
var physicsBody = SKPhysicsBody(rectangleOfSize: CGSizeMake(100, 100))
Alternatively, you can set the size directly on the SKSpriteNode or use one of its constructors that take a CGSize construct like initWithTexture:color:size: