I have a rectangle that needs to be constantly moving up, but is also declared globally like so so that I can call it in multiple places:
var obstacle = SKNode!
override func didMoveToView {
obstacle = rectangle()
}
func rectangle() -> SKNode {
let rect = SKSpriteNode(imageNamed: "Rectangle#x2")
rect.size = CGSizeMake(30, 30)
rect.position = CGPointMake(210, -250)
rect.physicsBody?.categoryBitMask = PhysicsCatagory.littleRect
rect.physicsBody?.contactTestBitMask = PhysicsCatagory.bigRect
rect.physicsBody?.collisionBitMask = 0
rect.physicsBody = SKPhysicsBody(rectangleOfSize: rect.size)
rect.physicsBody?.dynamic = true
rect.physicsBody?.affectedByGravity = false
rect.runAction(
SKAction.moveByX(0, y: 1200,
duration: NSTimeInterval(6.5)))
addChild(rect)
return rect
}
When I attempt to run it as an action repeating forever like so, i get the error "cannot convert value of type SKNode to argument runBlock" :
runAction(SKAction.repeatActionForever(
SKAction.sequence([
SKAction.runBlock(rectangle),
SKAction.waitForDuration(4.0)])))
So is there a way to declare this sort of action for a function set up like this? Thank you in advance.
First of all, this var obstacle = SKNode! will produce an error. You should declare an implicitly unwrapped optional like this:
var obstacle:SKNode!
About the main question (without analyzing the logic of what code actually does,)...You are passing an instance of SKNode class to +runBlock: method (which accepts a closure), thus the error. To fix this, you have to pass a closure, like this:
override func didMoveToView(view: SKView) {
runAction(SKAction.repeatActionForever(
SKAction.sequence([
SKAction.runBlock({[unowned self] in self.rectangle()}),
SKAction.waitForDuration(4.0)])))
}
Related
I'm adding a SKErmitterNode from the update() function. I want to remove the SKErmitterNode after 2 seconds, therefore I made a sequence but in the sequence, I can´t add Nodes. And if I add the Node outside of the sequence it gets added over and over again(because I´m doing all of this in the update function) Does someone know a better way to do this?
Here is my Code from the update function:
override func update(_ currentTime: CFTimeInterval) {
if player.position.y <= player.size.height / 2{
self.player.removeFromParent()
if let particles = SKEmitterNode(fileNamed: "MyParticle.sks") {
particles.position = player.position
let addParticle = addChild(particles)
let wait = SKAction.wait(forDuration: 2.0)
let removeParticle = SKAction.removeFromParent()
let particleSequence = SKAction.sequence([addParticle, wait, removeParticle]) //Error ->Cannot convert value of type 'Void' to expected element type 'SKAction'
self.run(SKAction.run(particleSequence))
}
}
So what I recommend for you to do is to create a function like the following
func myExplosion (explosionPosition: CGPoint){
let explosion = SKEmitterNode(fileNamed: "MyParticle")// borrowed this from you
explosion?.position = explosionPosition
explosion?.zPosition = 3
self.addChild(explosion!)
self.run(SKAction.wait(forDuration: 2)){//you can always change the duration to whatever you want
explosion?.removeFromParent()
}
}
then when it is time to use this function, use it like so
myExplosion(explosionPosition: player.position)
Hope this can help you out.
I have a function in my ScoreSystem class named addScore. The function adds 1 point to the game, updates the SKLabelNode to the current score and in turn calls the function startNewLevel every 25 points.
func addScore(scene: SKScene) {
gameScore += 1
scoreLabel.text = "\(gameScore)"
if CGFloat(gameScore).truncatingRemainder(dividingBy: 25) == 0 {
NotificationCenter.default.post(name: Notification.Name.init("start_new_level"), object: nil)
GameScreen().displayLevel(scene: scene)
}
}
The function gets called every time a torpedo that has been fired hits the enemy. I now want to add a new level where meteors (SKSpriteNode) have to be avoided. I have several SKActions in a sequence to accomplish this. Essentially, the SKSpriteNode moves from the top of the screen, reaches below the screen and gets deleted. If the meteor reaches the bottom of the screen means that it has been avoided by the player.
I'm attempting to call the function addScore but it doesn't update.
Here is the function:
let scoreSystem = ScoreSystem()
func spawnMeteor() {
let randomXStart = CGFloat.random(min: gameArea.minX, max: gameArea.maxX)
let startPoint = CGPoint(x: randomXStart, y: scene.size.height * 1.2)
let endPoint = CGPoint(x: randomXStart, y: -scene.size.height * 0.2)
let meteor = SKSpriteNode(imageNamed: "meteor")
meteor.name = "Meteor"
meteor.zPosition = 2
meteor.position = startPoint
let moveMeteor = SKAction.move(to: endPoint, duration: 3)
let deleteEnemy = SKAction.removeFromParent()
let score = SKAction.run(addToScore)
let meteorSequence = SKAction.sequence([
moveMeteor,
score,
deleteEnemy])
scene.addChild(meteor)
meteor.run(meteorSequence)
}
I have tried a function addToScore like this:
func addToScore() {
scoreSystem.addScore(scene: scene!)
}
And also tried this
func addToScore() {
NotificationCenter.default.post(name: Notification.Name.init("add_to_score"), object: nil)
}
When trying this second alternative, I add the following to the GameScene
override func sceneDidLoad() {
super.sceneDidLoad()
NotificationCenter.default.addObserver(forName: Notification.Name.init("add_to_score"), object: nil, queue: OperationQueue.main) { [weak self] (notification) in
self?.scoreSystem.addScore(scene: self!)
}
}
I removed several lines from the spawnMeteor() function so not to clog the space with unnecessary lines of code. I have yet to figure out how to call that function using SKAction.run(). Can someone point me in the right direction?
You are passing along a lot of information to your functions, probably too much.
I would suggest either you implement Protocols or Notifications to handle your information, personally I prefer protocols so my example will be protocols.
I am making some assumptions about your code because not all of it is presented in your question...
protocol ScoreSystemDelegate: class {
func displayLevel()
}
class ScoreSystem: SKNode {
weak var scoreSystemDelegate: ScoreSystemDelegate!
//your init func and any other funcs in this class (unknown)
func addScore(scene: SKScene) {
gameScore += 1
scoreLabel.text = "\(gameScore)"
if CGFloat(gameScore).truncatingRemainder(dividingBy: 25) == 0 {
NotificationCenter.default.post(name: Notification.Name.init("start_new_level"), object: nil)
//GameScreen().displayLevel(scene: scene)
self.scoreSystemDelegate.displayLevel()
}
}
}
in your class that creates the scoreSystem (assuming GameScene)...
class GameScene: SKScene, ScoreSystemDelegate {
let scoreSystem = ScoreSystem()
//assign GameScene as the delegate of ScoreSystem that way the 2 can communicate
scoreSystem.scoreSystemDelegate = self
func displayLevel() {
//do whatever you do when you display the level
}
}
now your spawn meteor func should work as you have coded because addScore no longer takes a scene property, nice thing about this approach is that you can make any object a delegate of ScoreSystem it doesn't have to be a scene.
I faced a problem, when accessing an object I added to my scene within my collision detection:
Within my GamScene.swift on the top I declared
var passenger: PassengerNode!
And I trigger a spawnPassenger method, which is looking like this
func spawnPassenger(x: CGFloat, y: CGFloat){
let passenger = SKSpriteNode(imageNamed: "passenger")
passenger.position = CGPoint(x: platformArray[2].position.x, y: platformArray[2].position.y)
passenger.position.x = x
passenger.position.y = y
//passenger.physicsBody!.categoryBitMask = PhysicsCategory.Passenger
passenger.zPosition = 5
passenger.anchorPoint = CGPointZero
//print("passenger spawned")
self.addChild(passenger)
}
The App builds fine, but as soon as the collision is fired and this Action is triggered:
func actionPassengerOnboarding(){
let moveToTaxi = SKAction.moveTo(CGPoint(x: taxiNode.position.x, y: platformNode3.position.y), duration: 2);
let removePassenger = SKAction.removeFromParent()
let setPassengerToOnBoard = SKAction.runBlock({ () -> Void in
self.passengerOnBoard = true
})
let onBoardActionSequence = SKAction.sequence([moveToTaxi, removePassenger, setPassengerToOnBoard])
self.passenger.runAction(onBoardActionSequence, withKey: "isOnboarding")
}
is triggered I get a crash and a fatal error printed out fatal error: unexpectedly found nil while unwrapping an Optional value
(lldb)
Can anyone point me to my error? I just cant figure it out
Your error is the first line of your spawnPassenger function. You're making a new constant with let that has scope to that function. Instead of re-declaring a passenger variable, I think you're intending to set it to the class variable you made before. Remove the let and just say:
passenger = SKSpriteNode(imageNamed: "passenger")
This way, you're only referencing that one passenger variable and not making a new one with local scope.
In my GameScene class, I have a method called shootLaser that creates an SKSpriteNode called Laser, and adds it as a child of self. This method is called on a timer every several seconds
func shootLaser(){
var Laser = SKSpriteNode(imageNamed: "LaserDot.png")
Laser.position = CGPointMake(100, 100)
Laser.physicsBody = SKPhysicsBody(circleOfRadius: 20)
Laser.physicsBody?.categoryBitMask = PhysicsCatagory.Laser
Laser.physicsBody?.contactTestBitMask = PhysicsCatagory.Blade
Laser.physicsBody?.affectedByGravity = false
Laser.physicsBody?.dynamic = false
Laser.physicsBody?.density = 0.5
self.addChild(Laser)
}
In the update() method, which is automatically called every time a frame is rendered, I try to access the position of the Laser object, but I get an error "Use of unresolved identifier 'Laser'" when I try to set laserLoc to Laser.position
override func update(currentTime: CFTimeInterval)
{
/* Called before each frame is rendered */
// moves every value up an index each frame
let laserLoc = Laser.position
if (laserPoints[0] != nil){
for var index = 9; index >= 1; index--
{
laserPoints[index] = laserPoints[index - 1]
}
laserPoints[0] = CGPointZero
}
I don't seem to have any issues accessing properties of SKSpriteNodes that are declared in the outside any method. Is there a way around this? Thanks in advance!
EDIT:
I am aware that "Laser" is purely local within the shootLaser() method, but just the same, is there a way I can access its properties in the update method?
Try instead putting Laser after the class declaration instead of instead of in the function. Like this:
class YourClassName: SKScene {
var Laser = SKSpriteNode(imageNamed: "LaserDot.png")
Also, make sure you remove the declaration of Laser inside the function and edit the function to look like this.
func shootLaser(){
var Laser = SKSpriteNode(imageNamed: "LaserDot.png")
Laser.position = CGPointMake(100, 100)
Laser.physicsBody = SKPhysicsBody(circleOfRadius: 20)
Laser.physicsBody?.categoryBitMask = PhysicsCatagory.Laser
Laser.physicsBody?.contactTestBitMask = PhysicsCatagory.Blade
Laser.physicsBody?.affectedByGravity = false
Laser.physicsBody?.dynamic = false
Laser.physicsBody?.density = 0.5
self.Laser.removeFromParent()
self.addChild(Laser)
}
I am wondering if its possible to increase withForDuration( ) with a variable. Heres how I am trying to do it in short. This is also SpriteKit, and this is my first time with it so I am still a little unsure. While this snippet of code works to change the float it doesn't actually change the waitForDuration(difficulty)
var timer: NSTimer!
var difficulty = 1.0
override func didMoveToView(view: SKView) {
backgroundColor = SKColor.whiteColor()
player.position = CGPoint(x: size.width * 0.5, y: size.height * 0.25)
player.physicsBody = SKPhysicsBody(circleOfRadius: player.size.width/2)
player.physicsBody?.dynamic = true
addChild(player)
physicsWorld.gravity = CGVectorMake(0, 0)
physicsWorld.contactDelegate = self
var timer = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: "increaseDifficulty", userInfo: nil, repeats: true)
runAction(SKAction.repeatActionForever(
SKAction.sequence([
SKAction.runBlock(addEnemy),
SKAction.waitForDuration(difficulty)
])
))
}
func increaseDifficulty() {
difficulty -= 0.1
}
One way to do this is to use the completionHandler of the runAction function. For example.
func addEnemyWithChangingDifficulty() {
let waitAction = SKAction.waitForDuration(difficulty)
let addEnemyAction = SKAction.runBlock { () -> Void in
self.addEnemy()
}
runAction(SKAction.sequence([addEnemyAction,waitAction]), completion: { () -> Void in
self.addEnemyWithChangingDifficulty()
})
}
Another way would be to use the update function to track the waitDuration.
var lastAddedTime : CFTimeInterval = 0
override func update(currentTime: CFTimeInterval) {
if currentTime - lastAddedTime > CFTimeInterval(difficulty) {
addEnemy()
lastAddedTime = currentTime
}
}
You're not getting your intended effect because the value of 'difficulty' is captured in the first declaration of your SKAction and it never refers to the outside declaration again.
Two ways to solve this:
Instead of doing SKAction.repeatActionForever(), dump the SKAction.sequence() in increaseDifficulty. You'll have to tweak the numbers a bit to make it work, but NSTimer is already running on repeat, you can use that instead.
The second way (not 100% sure about this) is to put the '&' symbol in front of difficulty. This passes difficulty by reference rather by value, which should give you the intended effect. I'm just not sure if Swift allows this, but in C++ that's what we can do.