I am trying to create 2 scenes in my maze game and this is the error message that I get. There is no sprite in any of my SKS files with these coordinates, so I am very confused as to what physics body it cannot load...
mazeGame[18879:890324] *** Terminating app due to uncaught exception 'Cant add body, already exists in a world', reason: 'Cant add body <SKPhysicsBody> type:<Rectangle> representedObject:[<SKScene> name:'gameScene2' frame:{{-375, -667}, {750, 1334}} anchor:{0.5, 0.5}], already exists in a world'
*** First throw call stack:
(
0 CoreFoundation 0x00000001107041e6 __exceptionPreprocess + 294
1 libobjc.A.dylib 0x000000010c64b031 objc_exception_throw + 48
2 CoreFoundation 0x0000000110779975 +[NSException raise:format:] + 197
3 PhysicsKit 0x000000011709585b -[PKPhysicsWorld addBody:] + 87
4 SpriteKit 0x000000010d0af05d -[SKNode insertChild:atIndex:] + 468
5 SpriteKit 0x000000010d0aee68 -[SKNode addChild:] + 68
6 mazeGame 0x000000010bd3526b _T08mazeGame0B6Scene2C7didMoveySo6SKViewC2to_tF + 379
7 mazeGame 0x000000010bd35c6c _T08mazeGame0B6Scene2C7didMoveySo6SKViewC2to_tFTo + 60
8 SpriteKit 0x000000010d075edf -[SKScene _didMoveToView:] + 173
9 SpriteKit 0x000000010d0962f2 -[SKView presentScene:transition:] + 347
10 mazeGame 0x000000010bd340e7 _T08mazeGame0B5SceneC8didBeginySo16SKPhysicsContactCF + 839
11 mazeGame 0x000000010bd3423c _T08mazeGame0B5SceneC8didBeginySo16SKPhysicsContactCFTo + 60
12 PhysicsKit 0x0000000117099a17 _ZN17PKContactListener13flushContactsEv + 571
13 PhysicsKit 0x00000001170975d6 -[PKPhysicsWorld stepWithTime:velocityIterations:positionIterations:] + 224
14 SpriteKit 0x000000010d076c3d -[SKScene _update:] + 3208
15 SpriteKit 0x000000010d096a21 -[SKView _update:] + 969
16 SpriteKit 0x000000010d0932db __51-[SKView _vsyncRenderForTime:preRender:postRender:]_block_invoke.316 + 281
17 SpriteKit 0x000000010d0926ef -[SKView _vsyncRenderForTime:preRender:postRender:] + 527
18 SpriteKit 0x000000010d093f91 __29-[SKView setUpRenderCallback]_block_invoke + 211
19 SpriteKit 0x000000010d0d79ea -[SKDisplayLink _callbackForNextFrame:] + 335
20 QuartzCore 0x0000000114d31850 _ZN2CA7Display11DisplayLink14dispatch_itemsEyyy + 834
21 QuartzCore 0x0000000114e73a12 _ZL22display_timer_callbackP12__CFMachPortPvlS1_ + 248
22 CoreFoundation 0x00000001106934b9 __CFMachPortPerform + 169
23 CoreFoundation 0x00000001106933f9 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 41
24 CoreFoundation 0x0000000110693361 __CFRunLoopDoSource1 + 465
25 CoreFoundation 0x000000011068af64 __CFRunLoopRun + 2532
26 CoreFoundation 0x000000011068a30b CFRunLoopRunSpecific + 635
27 GraphicsServices 0x0000000112a78a73 GSEventRunModal + 62
28 UIKit 0x000000010d2a0057 UIApplicationMain + 159
29 mazeGame 0x000000010bd380b7 main + 55
30 libdyld.dylib 0x00000001118e5955 start + 1
31 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
Also, here is my gamescene file code and my gamescene2 file code:
import SpriteKit
import GameplayKit
import CoreMotion
class GameScene: SKScene, SKPhysicsContactDelegate{
let gameScene = SKScene()
var playerSprite = SKSpriteNode()
var nextNode = SKSpriteNode()
let motionManager = CMMotionManager()
override func didMove(to view: SKView) {
self.physicsWorld.contactDelegate = self
playerSprite = self.childNode(withName: "playerSprite") as! SKSpriteNode
nextNode = self.childNode(withName: "nextNode") as! SKSpriteNode
motionManager.startAccelerometerUpdates()
motionManager.accelerometerUpdateInterval = 0.1
motionManager.startAccelerometerUpdates(to: OperationQueue.main) {
(data,error) in
self.physicsWorld.gravity = CGVector(dx: CGFloat((data?.acceleration.x)!) * 10, dy: CGFloat((data?.acceleration.y)!) * 10)
}
}
func didBegin(_ contact: SKPhysicsContact) {
let bodyA = contact.bodyA
let bodyB = contact.bodyB
if bodyA.categoryBitMask == 1 && bodyB.categoryBitMask == 2 || bodyA.categoryBitMask == 2 && bodyB.categoryBitMask == 1{
let transition = SKTransition.fade(withDuration: 0.5)
let gameScene2 = GameScene2(size: self.size)
self.view?.presentScene(gameScene2, transition: transition)
playerSprite.removeFromParent()
nextNode.removeFromParent()
}
}
override func update(_ currentTime: TimeInterval) {
// Called before each frame is rendered
}
}
(here is the gamescene 2)
import SpriteKit
import GameplayKit
import CoreMotion
import SceneKit
class GameScene2: SKScene, SKPhysicsContactDelegate{
let motionManager = CMMotionManager()
var playerSprite2 = SKSpriteNode()
var nextNode2 = SKSpriteNode()
override func didMove(to view: SKView) {
let gameScene2 = SKScene(fileNamed: "GameScene2")
self.addChild(gameScene2!)
self.physicsWorld.contactDelegate = self
playerSprite2 = self.childNode(withName: "playerSprite2") as! SKSpriteNode
nextNode2 = self.childNode(withName: "nextNode2") as! SKSpriteNode
playerSprite2.physicsBody = nil
nextNode2.physicsBody = nil
motionManager.startAccelerometerUpdates()
motionManager.accelerometerUpdateInterval = 0.1
motionManager.startAccelerometerUpdates(to: OperationQueue.main) {
(data,error) in
self.physicsWorld.gravity = CGVector(dx: CGFloat((data?.acceleration.x)!) * 10, dy: CGFloat((data?.acceleration.y)!) * 10)
}
}
func didBegin(_ contact: SKPhysicsContact) {
let bodyA = contact.bodyA
let bodyB = contact.bodyB
if bodyA.categoryBitMask == 1 && bodyB.categoryBitMask == 2 || bodyB.categoryBitMask == 2 && bodyA.categoryBitMask == 1{
print("Yay!!!")
}
}
override func update(_ currentTime: TimeInterval) {
// Called before each frame is rendered
}
}
In your game scene file, you are creating and presenting a GameScene2 object:
let gameScene2 = GameScene2(size: self.size)
self.view?.presentScene(gameScene2, transition: transition)
Then, in your Gamescene2 class didMove(to view: SKView) method, you are adding the same scene again:
let gameScene2 = SKScene(fileNamed: "GameScene2")
self.addChild(gameScene2!)
This is where the crash is happening. You can see from the stack trace, the last call in your own code is in the didMove(to...) method (its name is mangled by the compiler, but line 6 below):
5 SpriteKit 0x000000010d0aee68 -[SKNode addChild:] + 68
6 mazeGame 0x000000010bd3526b _T08mazeGame0B6Scene2C7didMoveySo6SKViewC2to_tF + 379
And you can see from line 5 above, that the subseqent call to addChild in SpriteKit is eventually leading to the crash.