I want to make sure that in class Home could invoke class HUD, and these two part code could be test Okay but when I run in Xcode, it crash and show up a issue:
"Fatal error: use of unimplemented initializer 'init(size:)' for class 'LeftBehind.HUD'"
I hope anyone could told me how to fixed it, thanks.
import UIKit
import SpriteKit
class HUD: SKScene {
let positionX:CGFloat
let positionY:CGFloat
let sceneSelf: SKScene
let year = SKLabelNode()
let month = SKLabelNode()
let day = SKLabelNode()
let hour = SKLabelNode()
let minute = SKLabelNode()
init(positionX:CGFloat,positionY:CGFloat,scene:SKScene) {
self.positionX = positionX
self.positionY = positionY
self.sceneSelf = scene
super.init()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
func hudShow() {
year.fontName = "Arial"
year.fontSize = 70
year.text = "This is a year"
year.fontColor = UIColor.whiteColor()
year.position = CGPoint(x: positionX , y: positionY)
sceneSelf.addChild(year)
}
}
Below class invoke above class
import SpriteKit
class Home: SKScene {
override func didMoveToView(view: SKView) {
let hud = HUD(positionX: frame.midX, positionY: frame.midY, scene: self)
hud.hudShow()
}
}
Edit: Upload another way which could work but not perfect way which I want to implement with initial rather than function refer.
instead of calling super.init() call super.init(size size: CGSize)
you can use your SKView's bounds.size property to pass into that initializer.
Related
I am attempting to detect the intersection of two scnnodes in SceneKit. They are registered as GKEntities. I want to associate a component to both entities that will detect the intersection of their physics bodies using SCNPhysicsContactDelegate, but I don't want to do this in the view controller as I know it is not best practice and it would make it difficult to register that as a component. Any help would be appreciated.
Thanks for the assistance,
Montreaux
import Foundation
import SpriteKit
import GameplayKit
import SceneKit
class MeleeComponent: GKComponent, SCNPhysicsContactDelegate {
let damage: CGFloat
let destroySelf: Bool
let damageRate: CGFloat
var lastDamageTime: TimeInterval
let aoe: Bool
// let sound: SKAction
let entityManager: EntityManager
init(damage: CGFloat, destroySelf: Bool, damageRate: CGFloat, aoe: Bool, entityManager: EntityManager) {
self.damage = damage
self.destroySelf = destroySelf
self.damageRate = damageRate
self.aoe = aoe
// self.sound = sound
self.lastDamageTime = 0
self.entityManager = entityManager
super.init()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
override func update(deltaTime seconds: TimeInterval) {
super.update(deltaTime: seconds)
// Get required components
guard let teamComponent = entity?.component(ofType: TeamComponent.self),
let spriteComponent = entity?.component(ofType: SpriteComponent.self) else {
return
}
// Loop through enemy entities
var aoeDamageCaused = false
let enemyEntities = entityManager.entitiesForTeam(teamComponent.team.oppositeTeam())
for enemyEntity in enemyEntities {
// Get required components
guard let enemySpriteComponent = enemyEntity.component(ofType: SpriteComponent.self),
let enemyHealthComponent = enemyEntity.component(ofType: HealthComponent.self) else {
continue
}
// Check for intersection
if (spriteComponent.node.frame.intersects(enemySpriteComponent.node.frame)) {
// Check damage rate
if (CGFloat(CACurrentMediaTime() - lastDamageTime) > damageRate) {
// Cause damage
// spriteComponent.node.parent?.run(sound)
if (aoe) {
aoeDamageCaused = true
} else {
lastDamageTime = CACurrentMediaTime()
}
// Subtract health
enemyHealthComponent.takeDamage(damage)
// Destroy self
if destroySelf {
entityManager.remove(entity!)
}
}
}
}
if (aoeDamageCaused) {
lastDamageTime = CACurrentMediaTime()
}
}
}
In SCNPhysicsWorld, There are a few APIs can help you.
such as
func contactTestBetween(_ bodyA: SCNPhysicsBody, _ bodyB: SCNPhysicsBody, options: [SCNPhysicsWorld.TestOption : Any]? = nil) -> [SCNPhysicsContact]
It's similar to the code in your example:
if (spriteComponent.node.frame.intersects(enemySpriteComponent.node.frame))
But it's in SceneKit and will give you more information about the contact.
I have a node I added in the scene. Also in the scene I give it a component to bounce. The component looks like this:
class BounceComponent: GKComponent, ComponentSetupProt {
var bounce: SKAction?
var node: SKSpriteNode?
#GKInspectable var diff: CGFloat = 0.2
#GKInspectable var startScale: CGFloat = 1
#GKInspectable var duration: TimeInterval = 0.5
override init() {
super.init()
comps.append(self)
}
required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
}
func setup() {
print("setup")
node = entity?.component(ofType: GKSKNodeComponent.self)!.node as? SKSpriteNode
setupBounce()
}
func setupBounce() {
...
}
func performBounce() {
print("performing")
node?.run(bounce!)
}
}//
In the didMove function on my scene file, it calls the components setup(). This works fine. I'm trying to call the function performBounce() when I click on the button...
if (play?.contains(pos))! {
print("test")
if let _ = play?.entity {
print("we have an entity")
}
play?.entity?.component(ofType: BounceComponent.self)?.performBounce()
}
When I click, the only thing it prints is "test" and the entity is nil. I was under the assumption that when you add a node to the editor, it also sets up the entity for that node, so I'm not sure why it is nil. Curious if anyone could shed some light on this?
Thanks for any help!
The entity on the SKSpriteNode is a weak reference, you need to make sure you retain your entities from your gameplaykit object
class GameViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Load 'GameScene.sks' as a GKScene. This provides gameplay related content
// including entities and graphs.
if let scene = GKScene(fileNamed: "Main") {
// Get the SKScene from the loaded GKScene
if let sceneNode = scene.rootNode as? Main {
sceneNode.entities = scene.entities // add this
// Set the scale mode to scale to fit the window
sceneNode.scaleMode = .aspectFill
// Present the scene
if let view = self.view as! SKView? {
view.presentScene(sceneNode)
view.showsDrawCount = true
view.ignoresSiblingOrder = true
view.showsFPS = true
view.showsNodeCount = true
}
}
}
}
class Main: Base {
var entities = [GKEntity]() // add this
Inside this, I'm not seeing goesTo getting assigned to nextScene. I assume this is a scope problem, but don't know enough to resolve it:
//
import SpriteKit
class MenuButton: SKLabelNode {
var goesTo: SKScene?
override init() {
super.init()
print("test... did this get called? WTF? HOW/WHY/WHERE?")
}
convenience init(text: String, color: SKColor, destination: SKScene){
self.init()
self.text = text
self.fontColor = color
goesTo = destination
self.isUserInteractionEnabled = true
print("gooing tooooo....", text, goesTo!) // WORKS!!!
}
override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
if let nextScene = goesTo {
self.scene?.view?.presentScene(nextScene, transition: SKTransition.doorsOpenVertical(withDuration: 0.25))
print("going to", nextScene) // This is NIL! SO NEVER GETS CALLED!
}
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
You code is correct, you can simply test it making for example a:
GameScene.swift
import SpriteKit
class GameScene: SKScene {
override func didMove(to view: SKView) {
print("- \(type(of:self))")
let helloScene = HelloScene.init()
helloScene.name = "helloScene"
let button1 = MenuButton.init(text: "HELLO", color: .red, destination: helloScene)
addChild(button1)
button1.position = CGPoint(x:self.frame.midX,y:self.frame.midY)
}
}
and you will see a red label in the middle of the screen with "HELLO".
As you can see also your prints looks good for both of your methods.
HelloScene.swift
import Foundation
import SpriteKit
class HelloScene: SKScene {
override func didMove(to view: SKView) {
print("- \(type(of:self))")
self.backgroundColor = .blue
}
}
Debug console:
So in my game i have a function that spawns coins,they are given the name "coin", Now I have no way to reference the coins,example to kill them or move them.So what I'm trying to do is make a reference to be able to use in my code to just change its zPosition.
Everytime I run my app and have a function run that uses the coinRef [ex. to change the zPosition], the app crashes with the error:
'Thread 1 EXC_BAD_INSTRUCTION (code=EXC_1386_INVOP, subcode=0x0)'
Heres my code:
let coinRef: SKSpriteNode = self.childNodeWithName("coin")! as! SKSpriteNode
func hideCoins() {
coinRef.zPosition = -1
}
func showCoins() {
coinRef.zPosition = 101
}
func killCoins() {
coinRef.removeFromParent()
}
Looking at what you write
So in my game i have a function that spawns coins,they are given the name "coin"
it looks like there are multiple coins in your scene. As you can imagine a single name coin is not enough to univocally identify more then 1 coin :)
We'll need a way do identity multiple coins.
1. The Coin class
class Coin: SKSpriteNode {
private static var lastID: UInt = 0
let id:UInt
init() {
self.id = Coin.lastID++
let texture = SKTexture(imageNamed: "coin")
super.init(texture: texture, color: UIColor.clearColor(), size: texture.size())
self.name = "coin"
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
As you can see Coin has an internal mechanism to assign a new id to each new instance. You can use this id to reference the coins in your scene.
let coin0 = Coin()
coin0.id // 0
let coin1 = Coin()
coin1.id // 1
let coin2 = Coin()
coin2.id // 2
2. Managing your coins
class GameScene: SKScene {
func retrieveCoin(id:UInt) -> Coin? {
return children.filter { ($0 as? Coin)?.id == id }.first as? Coin
}
func hideCoin(id:UInt) {
retrieveCoin(id)?.hidden = true
}
func showCoin(id:UInt) {
retrieveCoin(id)?.hidden = true
}
func deleteCoin(id:UInt) {
retrieveCoin(id)?.removeFromParent()
}
}
The retrieveCoin method returns (if does exist) a coin with the specified id. Otherwise nil is returned.
The hideCoin and showCoin do change the hidden property to change its visibility.
Finally deleteCoin remove from the scene the Coin with the specified id.
Try this. Initialise coinRef before the didMoveToView function, and then give coinRef its value in the didMoveToView function.
class scene : SKScene {
let coinRef: SKSpriteNode = SKSpriteNode()
override func didMoveToView(view: SKView) {
coinRef: SKSpriteNode = self.childNodeWithName("coin")! as! SKSpriteNode
}
func hideCoins() {
coinRef.zPosition = -1
}
func showCoins() {
coinRef.zPosition = 101
}
func killCoins() {
coinRef.removeFromParent()
}
}
I'm having trouble trying to get the frame.width of GameScene into a custom class because I need the scene width for positioning nodes in my custom class init.
HudController.swift snippet
import SpriteKit
class HudController:SKNode {
var width:CGFloat
override init(){
width = GameScene().frame.width //I was hoping to add the scene width here
}
}
The following code crashes on me and I've tried heaps of other solutions with no success.
Can someone please help me with this issue?
Thanks!
UPDATED CODE ===
GameScene.swift
import SpriteKit
class GameScene: SKScene {
var hud = HudController(gameScene: self)
// set as global because I'm using it to also call hud functions in my game
}
HudController.swift
import SpriteKit
class HudController:SKNode {
var width:CGFloat
init(gameScene:SKScene){
width = gameScene.size.width
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
Every node in SpriteKit can retrieve the scene where it lives using the scene property.
let node = SKNode()
node.scene
The scene property returns a SKScene?, the value is an optional because if the current node does not belong to a scene, of course there is not scene to retrieve.
Now, you could be tempted to use the self.scene property inside the initializer of your HudController.
class HudController: SKNode {
var width:CGFloat
override init() {
super.init() // error: property 'self.width' not initialized at super.init call
width = self.scene!.frame.width
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
But it will now work because you cannot invoke super.init before having initialized the width property.
Fine, then you could try this.
class HudController: SKNode {
var width:CGFloat
override init() {
width = self.scene!.frame.width // error: use of 'self' in property access 'scene' before super.init initializes self
super.init()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
Again compiler error because you are using self before having called super.init().
And finally there is another problem, when the initializer is executed, the node it is being created has not a parent yet, so the self.scene property does return nil.
How to solve this?
Solution
First of all declare you initializer to receive a GameScene.
class HudController: SKNode {
var width: CGFloat
init(gameScene:SKScene) {
width = gameScene.frame.width
super.init()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
Now, when you create this object (I hope you are doing it from the scene or from a node already added to the scene otherwise we are in trouble) you simply write
class Foo : SKNode {
func foo() {
guard let scene = self.scene else { return }
let controller = HudController(gameScene: scene)
}
}
On the other hand if you are creating HudController from you scene you simply write:
class MyScene : SKScene {
override func didMoveToView(view: SKView) {
super.didMoveToView(view)
let controller = HudController(gameScene: self)
}
}
That's it.
Update
If you want an instance property of HudController inside your GameScene this is the code.
class HudController: SKNode {
var width: CGFloat
init(gameScene:SKScene) {
width = gameScene.frame.width
super.init() // <-- do not forget this
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
class GameScene: SKScene {
var hud : HudController?
override func didMoveToView(view: SKView) {
super.didMoveToView(view)
hud = HudController(gameScene: self)
}
}