In SpriteKit when sound is being played it messes with accelerometer - ios

Question

I have an issue whereby I am moving the character based on the accelerometer data using the following code in the update function as follows:
let currentX = self.player.position.x
if motionManager.isAccelerometerAvailable == true {
motionManager.startAccelerometerUpdates(to: OperationQueue.current!, withHandler: {
data, error in
self.destX = currentX + CGFloat((data?.acceleration.x)! * 40)
print(CGFloat((data?.acceleration.x)!))
})
}
player.position.x = destX
Originally I was moving the player using SKAction.moveTo but have removed this for testing purposes.
This works ok but the problem is, I have a sound that is being played upon collision of an invisible object and when this is enabled it sends the accelerometer all funny. There is no specific pattern to it but after a little while the player usually sticks to either side of the screen or just hovers in the middle and the accelerometer doesn't have any effect on the movement.
I am playing the sound using
let playSound = SKAction.playSoundFileNamed("phaserDown3.mp3", waitForCompletion: false)
At the top of the file and then calling run on a collision.
The full code is in here http://pastebin.com/f6kWTnr7 and I have made a little video of the issue here https://youtu.be/tcGYyrKE4QY - as you will see, in this case when the score is at around 15 it sticks to the left for a little bit, then returns to normal then sticks to the right. It isn't always at score 15, it can be sooner or even later there is no consistency at all.
Any input will be greatly appreciated, thank you in advance

Answer 1

Take a look at this updated scene, some of the major changes are I combined your 3 separate blocks into 1 SKNode so that I only have to move the single SKNode, and I set it up where you score at the end of a contact, not the beginning. You can also see that the blocks now die when done scrolling, and your background is more efficient with its scrolling. If you have any other questions on the changes, feel free to ask.
//
// GameScene.swift
// SpriteKitSimpleGame
//
// Created by James Leist on 28/11/2016.
// Copyright © 2016 James Leist. All rights reserved.
//
import SpriteKit
import CoreMotion
var motionManager = CMMotionManager()
enum BodyType:UInt32 {
case player = 1
case score = 2
case dontCollide = 4
case sides = 8
}
class GameScene: SKScene, SKPhysicsContactDelegate {
var killNodes = [SKNode]()
//let player = SKSpriteNode(imageNamed: "Airplane")
let player = SKSpriteNode(color: .green, size: CGSize(width:32,height:32))
var bg1:SKSpriteNode!
var bg2:SKSpriteNode!
let block = SKNode()
let blockHeight = 50
var currentScore = 0
var scoreLabel:SKLabelNode!
let playSound = SKAction.playSoundFileNamed("phaserDown3.mp3", waitForCompletion: false)
let move = SKAction.move(by:CGVector(dx:0,dy:-4 * 60),duration:1) //this means we move 4 every 1/60 of a second
override func didMove(to view: SKView) {
physicsWorld.contactDelegate = self
backgroundColor = SKColor.white
addScrollingBG()
createRandomBlock()
addRandomBlocks1()
// sideRestraints()
scoreLabel = SKLabelNode(fontNamed: "Copperplate-Bold")
scoreLabel.text = String(currentScore)
scoreLabel.fontSize = 80
scoreLabel.position = CGPoint(x: frame.size.width - 60, y: frame.size.height - 60)
scoreLabel.zPosition = 20
self.addChild(scoreLabel)
player.name = "Player"
player.zPosition = 15
player.position = CGPoint(x: size.width * 0.5, y: size.height * 0.5)
// player.physicsBody = SKPhysicsBody(texture: SKTexture(imageNamed: "Airplane"), size: CGSize(width: player.size.width, height: player.size.height))
player.physicsBody = SKPhysicsBody(rectangleOf: CGSize(width: player.size.width, height: player.size.height))
player.physicsBody?.affectedByGravity = false
player.physicsBody!.categoryBitMask = BodyType.player.rawValue
player.physicsBody!.contactTestBitMask = BodyType.score.rawValue | BodyType.sides.rawValue
player.physicsBody!.collisionBitMask = 0
addChild(player)
startAccelerometer()
}
func startAccelerometer()
{
if motionManager.isAccelerometerAvailable == true {
motionManager.startAccelerometerUpdates(to: OperationQueue.current!, withHandler: {
[weak self] data, error in
guard let strongSelf = self else {return}
var destX = UInt32(strongSelf.player.position.x + CGFloat((data?.acceleration.x)! * 40))
// Called before each frame is rendered */
if destX <= 0 {
destX = 0
}
else if destX >= UInt32(strongSelf.frame.size.width) {
destX = UInt32(strongSelf.frame.size.width)
}
strongSelf.player.position.x = CGFloat(destX)
print(CGFloat((data?.acceleration.x)!))
})
}
}
func addScrollingBG() {
bg1 = SKSpriteNode(imageNamed: "bgPlayScene")
bg1 = SKSpriteNode(color:.blue,size:self.size)
bg1.anchorPoint = CGPoint.zero
bg1.position = CGPoint(x: 0, y: 0)
// bg1.size = CGSize(width: frame.size.width, height: frame.size.height)
bg1.zPosition = 0
addChild(bg1)
bg2 = SKSpriteNode(imageNamed: "bgPlayScene")
bg2 = SKSpriteNode(color:.purple,size:self.size)
bg2.anchorPoint = CGPoint.zero
bg2.position = CGPoint(x: 0, y: bg1.size.height)
// bg2.size = CGSize(width: frame.size.width, height: frame.size.height)
bg2.zPosition = 0
self.addChild(bg2)
setupBackgroundAnimation()
}
func setupBackgroundAnimation()
{
let reset = SKAction.customAction(withDuration: 1,actionBlock:
{
node,time in
guard let sNode = node as? SKSpriteNode else {return}
sNode.position = sNode.position.y <= -sNode.size.height ?
CGPoint(x: sNode.position.x, y: sNode.position.y + sNode.size.height * 2) : sNode.position
})
let scroll = SKAction.repeatForever(SKAction.group([move,reset]))
bg1.run(scroll)
bg2.run(scroll)
}
func createRandomBlock()
{
block.position = CGPoint(x:0,y:size.height + CGFloat(blockHeight))
//let partialBlock = SKSpriteNode(imageNamed: "block")
let partialBlock = SKSpriteNode(color:.yellow, size:CGSize(width: 1, height: blockHeight))
let blockLeft1 = partialBlock.copy() as! SKSpriteNode
blockLeft1.name = "left"
blockLeft1.anchorPoint = CGPoint.zero
blockLeft1.size = CGSize(width: 1, height: blockHeight)
blockLeft1.zPosition = 5;
blockLeft1.position = CGPoint.zero
block.addChild(blockLeft1)
let leftBody = SKPhysicsBody(rectangleOf: blockLeft1.size)
leftBody.affectedByGravity = false
leftBody.categoryBitMask = BodyType.sides.rawValue
leftBody.contactTestBitMask = 0
leftBody.collisionBitMask = 0
leftBody.isDynamic = false
blockLeft1.physicsBody = leftBody
let blockRight1 = partialBlock.copy() as! SKSpriteNode
blockRight1.color = .green
blockRight1.anchorPoint = CGPoint.zero
blockRight1.name = "right"
blockRight1.size = CGSize(width: 1, height: blockHeight)
blockRight1.zPosition = 5;
blockRight1.position = CGPoint(x:size.width,y:0)
block.addChild(blockRight1)
let rightBody = SKPhysicsBody(rectangleOf: blockRight1.size)
rightBody.affectedByGravity = false
rightBody.categoryBitMask = BodyType.sides.rawValue
rightBody.contactTestBitMask = 0
rightBody.collisionBitMask = 0
rightBody.isDynamic = false
blockRight1.physicsBody = rightBody
let scoreBody = SKPhysicsBody(rectangleOf:CGSize(width:Int(frame.size.width),height:blockHeight))
scoreBody.affectedByGravity = false
scoreBody.categoryBitMask = BodyType.score.rawValue
scoreBody.contactTestBitMask = 0
scoreBody.collisionBitMask = 0
scoreBody.isDynamic = false
block.physicsBody = scoreBody
}
func addRandomBlocks1() {
let randomLeftWidth : UInt32 = arc4random_uniform(UInt32(size.width) - 50)
let randomRightWidth : UInt32 = arc4random_uniform((UInt32(size.width) - randomLeftWidth) - 50)
guard let newBlock = block.copy() as? SKNode else {return} //ifw e do not have a node return
if let leftBlock = newBlock.childNode(withName:"left") as? SKSpriteNode
{
leftBlock.xScale = CGFloat(randomLeftWidth)
}
if let rightBlock = newBlock.childNode(withName:"right") as? SKSpriteNode
{
rightBlock.xScale = -CGFloat(randomRightWidth)
}
let addRandom = SKAction.customAction(withDuration: 0, actionBlock:
{
[unowned self] node,time in
if Int(node.position.y) < -self.blockHeight
{
node.removeFromParent()
self.addRandomBlocks1()
}
})
newBlock.run(SKAction.repeatForever(SKAction.group([move,addRandom])))
addChild(newBlock)
}
override func update(_ currentTime: CFTimeInterval) {
}
override func didFinishUpdate()
{
killNodes.forEach{$0.removeFromParent()}
}
func didBegin(_ contact: SKPhysicsContact) {
//This will organize the bodies so that the lowest category is A
let bodies = (contact.bodyA.categoryBitMask <= contact.bodyB.categoryBitMask) ? (A:contact.bodyA,B:contact.bodyB) : (A:contact.bodyB,B:contact.bodyA)
switch (bodies.A.categoryBitMask,bodies.B.categoryBitMask)
{
case let (a, b) where ((a & BodyType.player.rawValue) | (b & BodyType.sides.rawValue)) > 0:
killNodes.append(bodies.A.node!)
let label = SKLabelNode(text: "Gameover")
label.position = CGPoint(x:self.size.width/2,y:self.size.height/2)
addChild(label)
default:()
}
}
func didEnd(_ contact: SKPhysicsContact) {
//This will organize the bodies so that the lowest category is A
let bodies = (contact.bodyA.categoryBitMask <= contact.bodyB.categoryBitMask) ? (A:contact.bodyA,B:contact.bodyB) : (A:contact.bodyB,B:contact.bodyA)
switch (bodies.A.categoryBitMask,bodies.B.categoryBitMask)
{
case let (a, b) where ((a & BodyType.player.rawValue) | (b & BodyType.score.rawValue)) > 0:
currentScore += 1
run(playSound, withKey:"phaser")
scoreLabel.text = String(currentScore)
default:()
}
}
}