I am creating SKSpriteNode Programmatically with its own SKSpriteNode class. I am wondering how I can add this SKSpriteNode to the scene. My app keeps crashing when I try to addChild() in the didMove() function of my Scene Class.
class ChaosScene: SKScene {
var dragonNode: Dragon!
override func didMove(to view: SKView) {
dragonNode.createDragon()
addChild(dragonNode)
}
}
class Dragon: SKSpriteNode {
var dragonNode: SKSpriteNode!
func createDragon() {
// Create Dragon
dragonNode = SKSpriteNode(imageNamed: "dragon_2_fly_001")
dragonNode.name = "dragon"
dragonNode.physicsBody = SKPhysicsBody(circleOfRadius: 50)
let actionMove = SKAction.move(
to: CGPoint(x: -1000 ,y: dragonNode.position.y),
duration: 2.0)
dragonNode.run(actionMove)
}
}
you're not actually creating anything.
class ChaosScene: SKScene {
var dragonNode: Dragon!
override func didMove(to view: SKView) {
dragonNode = Dragon()
addChild(dragonNode)
}
}
you have to initialize your SpriteNodes before you can add them to the scene
class Dragon: SKSpriteNode {
var dragonNode: SKSpriteNode!
init() {
super.init(texture: nil, color: .clear, size: CGSize.zero)
// Create Dragon
dragonNode = SKSpriteNode(imageNamed: "dragon_2_fly_001")
dragonNode.name = "dragon"
dragonNode.physicsBody = SKPhysicsBody(circleOfRadius: 50)
addChild(dragonNode)
let actionMove = SKAction.move(to: CGPoint(x: -1000 ,y: dragonNode.position.y), duration: 2.0)
dragonNode.run(actionMove)
}
}
Related
This is from a simple game in SpriteKit with a Ball() class that has a function shieldOn() which, for the moment, simply replaces the texture of a single ball to that of a ball surrounded by a shield.
The ball is created like this in GameScene:
func getBall() {
let ball = Ball()
ball.createBall(parentNode: self)
}
Here is the Ball class
class Ball: SKSpriteNode {
func createBall(parentNode: SKNode) {
let ball = SKSpriteNode(texture: SKTexture(imageNamed: "ball2"))
ball.physicsBody = SKPhysicsBody(circleOfRadius: 25)
ball.name = "ball"
parentNode.addChild(ball)
ball.size = CGSize(width: 50, height: 50)
ball.position = CGPoint(x: 20, y: 200)
launch(spriteNode: ball, parentNode: parentNode)
}
private func launch(spriteNode: SKSpriteNode, parentNode: SKNode) {
spriteNode.physicsBody?.applyImpulse(CGVector(dx: 5, dy: 0))
}
func shieldOn() {
self.texture = SKTexture(imageNamed: "ballShield")
}
func shieldOff() {
self.texture = SKTexture(imageNamed: "ball2")
}
}
In the main section of my code (GameScene.swift) I don't have a reference to the ball. So I cycle through all of the nodes on the screen and try to cast the matching one as shown below. I crash with an error saying that it could not cast value of type SKSpriteNode to Ball.
for node in self.children {
if node.name == "ball" {
let ball = node as! Ball
ball.shieldOn()
}
}
I've tried a few variations with no luck. Am I at least working in the right direction? Thanks!
With the new information I think you want something like this:
Ball Class:
class Ball: SKSpriteNode{
init() {
let texture = SKTexture(imageNamed: "ball2")
let size = CGSize(width: 50, height: 50)
super.init(texture: texture, color: UIColor.clear, size: size)
self.name = "ball"
self.physicsBody = SKPhysicsBody(circleOfRadius: size.height/2)
self.physicsBody?.applyImpulse(CGVector(dx: 5, dy: 0))
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func shieldOn() {
self.texture = SKTexture(imageNamed: "ballShield")
}
func shieldOff() {
self.texture = SKTexture(imageNamed: "ball2")
}
}
Then use this to create the ball:
func getBall() {
let ball = Ball()
ball.position = CGPoint(x: 20, y: 200)
scene?.addChild(ball)
}
Perhaps a better way to do this would be to keep an array of all Balls created and added to the scene. Then you could just iterate through your array and update their texture. You would not need to enumerate them on the screen, which can decrease performance if there are many moving sprites.
As far as your code goes, it looks like you might be affected by this bug:
https://forums.developer.apple.com/thread/26362
I tried copying the template code from a SpriteKit project into a playground, but all I get is a grey screen when I present the Scene. Do I need to create an SKScene and if so how do I assign it to the scene class that I am using.
The following is my code to create and present the scene:
#objc func goToGameScene(){
print("GameView Loaded")
sceneView = SKView(frame: CGRect(x: 0, y: 0, width: 666, height: 500))
sceneView.backgroundColor = UIColor.black
PlaygroundPage.current.liveView = sceneView
if let view = self.sceneView as SKView? {
// Load the SKScene from 'GameScene.sks'
if let scene = SKScene(fileNamed: "GameScene") {
// Set the scale mode to scale to fit the window
scene.scaleMode = .aspectFill
// Present the scene
view.presentScene(scene)
}
view.ignoresSiblingOrder = true
}
And this is my SKScene class, which has a filename of GameScene.swift.
import Foundation
import SpriteKit
import GameplayKit
class GameScene: SKScene, SKPhysicsContactDelegate {
var bg = SKSpriteNode()
func didBegin(_ contact: SKPhysicsContact) {
}
override func didMove(to view: SKView) {
self.physicsWorld.contactDelegate = self
let bgTexture = SKTexture(image: UIImage(named: "MainScreenBackground.png")!)
let moveBGAnimation = SKAction.move(by: CGVector(dx:-bgTexture.size().width, dy:0), duration: 11)
let shiftBackground = SKAction.move(by: CGVector(dx: bgTexture.size().width, dy:0), duration: 0)
let repeatAnimationBg = SKAction.repeatForever(SKAction.sequence([moveBGAnimation, shiftBackground]))
var q = 0
while(q < 3){
bg = SKSpriteNode(texture: bgTexture)
bg.position = CGPoint(x: bgTexture.size().width * CGFloat(q), y: self.frame.midY)
bg.size.height = self.frame.height
bg.run(repeatAnimationBg)
self.addChild(bg)
q+=1
bg.zPosition = -1
}
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
}
override func update(_ currentTime: TimeInterval) {
}
}
Assuming you have dragged and dropped your MainScreenBackground.png image into you Assets.xcassets folder, you can use the code below to add the image to your scene as a SKSpriteNode.
override func didMove(to view: SKView) {
self.physicsWorld.contactDelegate = self
let bgTexture = SKSpriteNode(imageNamed: "MainScreenBackground")
self.addChild(bgTexture)
...
I have two separate nodes with their own physics bodies, and when they collide, an SKScene with the high score and replay button should present itself. This is how my scene is called:
func didBeginContact(contact: SKPhysicsContact) {
gameOver()
print("gameOver")
}
And this is how my physics bodies for my nodes are set up:
func createDown(position: CGPoint) -> SKNode {
let circleNode = SKSpriteNode()
let circle = SKSpriteNode(imageNamed: "first#2x")
circleNode.position = CGPointMake(position.x, position.y)
circleNode.physicsBody = SKPhysicsBody(circleOfRadius: 30)
circleNode.physicsBody?.dynamic = false
circle.size = CGSize(width: 75, height: 75)
circleNode.addChild(circle)
circleNode.name = "circleNode"
circle.name = "CIRCLE"
let up = SKAction.moveByX(0, y: -9000, duration: 100)
physicsBody?.categoryBitMask = blackCategory
circleNode.runAction(up)
return circleNode
}
func playerPhysics() {
player.physicsBody = SKPhysicsBody(circleOfRadius: 30)
player.physicsBody?.affectedByGravity = false
player.physicsBody?.categoryBitMask = playerCategory
player.physicsBody?.contactTestBitMask = blackCategory
}
And here is my gameOver function:
func gameOver() {
gameEnd = true
let reveal = SKTransition.fadeWithDuration(1)
let scene = GameOver(size: self.scene!.size)
view!.presentScene(scene, transition: reveal)
}
Am I missing something? Will post more code if necessary.
Just use intersectsNode and call gameOver() when the two nodes collide.
if yourNode.intersectsNode(yourSecondNode) {
gameOver()
}
SKNode Class Reference: SKNode
You need to add the physics world as a contact delegate for your methods to work.
class GameScene: SKScene, SKPhysicsContactDelegate {
override func didMoveToView(view: SKView) {
physicsWorld.contactDelegate = self
And like Whirlwind said, you need to set your categoryBitMask and contactTestBitMask for the circle node.
Then everything should work. I hope I could help.
When I try to run an action on a sprite I've set a constant for in didMoveToView, I use the same name for it in the touchesBegan function and get a "use of unresolved identifier: "player" error. I have another game where I so the exact same thing and it runs perfectly. Need help! Here is my code:
import SpriteKit
class GameScene: SKScene {
var movingGround : MCTGround!
var fruitGenerator : MCTFruitGen!
var cloudGenerator: MCTCloudGen!
var isStarted = false
override func didMoveToView(view: SKView) {
let player = SKSpriteNode(imageNamed: "koala_idle")
player.position = CGPointMake(95, 150)
addChild(player)
backgroundColor = UIColor(red: 159.0/255.0, green: 201.0/255.0, blue: 244.0/255.0, alpha: 1.0)
movingGround = MCTGround(size: CGSizeMake(view.frame.width, 20))
movingGround.position = CGPointMake(0, view.frame.size.height / 4)
addChild(movingGround)
fruitGenerator = MCTFruitGen(color: UIColor.clearColor(), size: view.frame.size)
fruitGenerator.position = view.center
addChild(fruitGenerator)
let frames = [
SKTexture(imageNamed: "koala_idle"),
SKTexture(imageNamed: "koala_walk01"),
SKTexture(imageNamed: "koala_walk02"),
]
let duration = 1.5 + drand48() * 1.0
let move = SKAction.animateWithTextures(frames, timePerFrame:0.10)
let wait = SKAction.waitForDuration(duration)
let rest = SKAction.setTexture(frames[0])
let sequence = SKAction.sequence([move, rest])
player.runAction(SKAction.repeatActionForever(sequence))
cloudGenerator = MCTCloudGen(color: UIColor.clearColor(), size: view.frame.size)
cloudGenerator.position = view.center
addChild(cloudGenerator)
cloudGenerator.populate(7)
cloudGenerator.startGeneratingWithSpawnTime(1)
}
func start() {
isStarted = true
cloudGenerator.startGeneratingWithSpawnTime(1)
}
override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
jumpPlayer()
movingGround.start()
fruitGenerator.startGeneratingFruitEvery(1)
}
override func update(currentTime: CFTimeInterval) {
}
func jumpPlayer() {
let jumpUpAction = SKAction.moveByX(0, y: 40, duration: 0.5)
let jumpDownAction = SKAction.moveByX(0, y: -40, duration: 0.5)
let jumpSequence = SKAction.sequence([jumpUpAction, jumpDownAction])
player.runAction(jumpSequence) // This is where my error is
}
}
Make player a class scope variable (property). Declare it not in a function, but a level above.
var player: SKSpriteNode?
override func didMoveToView(view: SKView) {
player = SKSpriteNode ...
then access it via player?. The safest way.
Your problem is that you are declaring player inside didMoveToView. This makes it private to the didMoveToView method. All you need to do is move let player = SKSpriteNode(imageNamed: "koala_idle") to where you declare movingGround and the other variables with it.
The beginning your code should look like this:
import SpriteKit
class GameScene: SKScene {
var movingGround : MCTGround!
var fruitGenerator : MCTFruitGen!
var cloudGenerator: MCTCloudGen!
let player = SKSpriteNode(imageNamed: "koala_idle")
var isStarted = false
override func didMoveToView(view: SKView) {
player.position = CGPointMake(95, 150)
addChild(player)
Go to File Inspector (right click on the file referenced in the error and select Show File Inspector). In Target Membership make sure your actual app is selected.
In my case only the Test modules were selected.
So as far as I can tell (I'm new to all this), the referenced file was hidden/unregistered with the ViewController.
How do you make a sprite rock back and forth constantly like a boat?
Heres the code i wrote:
import UIKit
import SpriteKit
let boat = SKSpriteNode(imageNamed: "boat_floor")
var rotationVal = CGFloat(-1)
class GameScene: SKScene {
override func didMoveToView(view: SKView) {
backgroundColor = UIColor.whiteColor()
boat.size = CGSize(width: self.frame.size.width, height: self.frame.size.width)
boat.position = CGPoint(x: self.frame.size.width/2, y: 0)
boat.physicsBody = SKPhysicsBody(texture: SKTexture(imageNamed: "boat_floor"), size: boat.size)
boat.physicsBody?.dynamic = false
boat.alpha = 1
self.addChild(boat)
ChangeAngle()
NSTimer.scheduledTimerWithTimeInterval(3, target: self, selector: Selector("ChangeAngle"), userInfo: nil, repeats: true)
}
func ChangeAngle(){
let action = SKAction.rotateByAngle(rotationVal, duration:30)
if rotationVal < 0 {
rotationVal = CGFloat(M_PI)
boat.runAction(action)
}
else if rotationVal > 0 {
rotationVal = -CGFloat(M_PI)
boat.runAction(action)
}
print(rotationVal)
}
}
If I understand you correctly, you can do it like this (just copy&paste the code to see how it works):
import UIKit
import SpriteKit
let boat = SKSpriteNode(color: SKColor.greenColor(), size:CGSize(width: 200, height: 80))
class GameScene: SKScene {
override func didMoveToView(view: SKView) {
backgroundColor = UIColor.whiteColor()
boat.position = CGPoint(x: self.frame.size.width/2, y: 100)
boat.alpha = 1
self.addChild(boat)
let rotate = SKAction.rotateByAngle(-0.6, duration:4)
let sequence = SKAction.repeatActionForever(SKAction.sequence([rotate, rotate.reversedAction()]))
let complete = SKAction.sequence([SKAction.rotateByAngle(0.3, duration:2), sequence])
boat.runAction(complete, withKey:"someKey")
}
}
Using NSTimer is generally bad idea in SpriteKit because it don't respect node's, scene's or view's paused state.