[英]app keeps crashing , Terminating app due to uncaught exception 'NSInvalidArgumentException'
我正在创建一个游戏，其中随机对象落在随机位置，并且球的y轴固定，并且沿x轴不断移动，并且必须移动以扔出对象，并且我试图计算得分和我这样做的方式是创建一个物理对象，并将其放置在与球相同的y轴上，并且当对象碰撞时，应调用得分函数并将得分增加1，但由于某些原因，应用程序会保持崩溃，这给了我这个错误。
2015-07-13 01:23:17.242 WalkRun[26792:3773366] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Attemped to add a SKNode which already has a parent: <SKSpriteNode> name:'(null)' texture:[<SKTexture> 'shortwall' (60 x 60)] position:{30, 768} size:{60, 60} rotation:0.00'
*** First throw call stack:
(
0 CoreFoundation 0x00000001073c33f5 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x00000001092eabb7 objc_exception_throw + 45
2 CoreFoundation 0x00000001073c332d +[NSException raise:format:] + 205
3 SpriteKit 0x0000000107ebfaf6 -[SKNode addChild:] + 111
4 WalkRun 0x00000001071c8c44 _TFC7WalkRun9PlayScene10leftObjectfS0_FT_T_ + 2868
5 WalkRun 0x00000001071c7ddc _TFC7WalkRun9PlayScene10randObjectfS0_FT_T_ + 236
6 WalkRun 0x00000001071c8102 _TToFC7WalkRun9PlayScene10randObjectfS0_FT_T_ + 34
7 Foundation 0x0000000107a39fd4 __NSFireTimer + 83
8 CoreFoundation 0x000000010732b4e4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 20
9 CoreFoundation 0x000000010732b0a5 __CFRunLoopDoTimer + 1045
10 CoreFoundation 0x00000001072ee3dd __CFRunLoopRun + 1901
11 CoreFoundation 0x00000001072eda06 CFRunLoopRunSpecific + 470
12 GraphicsServices 0x000000010e7569f0 GSEventRunModal + 161
13 UIKit 0x0000000108046550 UIApplicationMain + 1282
14 WalkRun 0x00000001071d54ce top_level_code + 78
15 WalkRun 0x00000001071d550a main + 42
16 libdyld.dylib 0x0000000109ad9145 start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
这是我的代码：
//
// PlayScene.swift
// WalkRun
//
// Created by naeim on 7/10/15.
// Copyright (c) 2015 naeim. All rights reserved.
//
import Foundation
import SpriteKit
class PlayScene: SKScene, SKPhysicsContactDelegate{
var ball = SKSpriteNode(imageNamed: "ball")
var wall = SKNode()
var wallRight = SKNode()
var wallMiddle = SKNode()
var ballSpeed = CGFloat()
var bigWall = SKSpriteNode(imageNamed: "shortwall")
var tallWall = SKSpriteNode(imageNamed: "tallwall")
var ballGroup:UInt32 = 1
var objectGroup:UInt32 = 2
var gapGroup:UInt32 = 3
var gameOver = 0
var movingObjects = SKNode()
var score = 0
var scoreLabel = SKLabelNode()
override func didMoveToView(view: SKView) {
self.physicsWorld.contactDelegate = self
backgroundColor = UIColor(hex: 0x80d9ff)
self.physicsWorld.gravity = CGVectorMake(-9,0)
self.addChild(movingObjects)
//creating the ball
ball.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMinY(self.frame) + self.ball.size.height * 2)
ball.physicsBody = SKPhysicsBody(circleOfRadius: self.ball.size.width / 2)
ball.zPosition = 10
//let the ball rotate forever
ballSpeed = 3
let rotateAction = SKAction.rotateByAngle(ballSpeed, duration: 1)
let repeatAction = SKAction.repeatActionForever(rotateAction)
ball.runAction(repeatAction)
ball.physicsBody?.categoryBitMask = ballGroup
ball.physicsBody?.collisionBitMask = objectGroup
ball.physicsBody?.contactTestBitMask = objectGroup
self.addChild(ball)
//creating the wall of the left
wall.position = CGPointMake(CGRectGetMinX(self.frame),CGRectGetMinY(self.frame))
wall.physicsBody = SKPhysicsBody(rectangleOfSize: CGSizeMake(2, self.frame.size.height * 2.0))
wall.physicsBody?.dynamic = false
wall.physicsBody?.categoryBitMask = objectGroup
self.addChild(wall)
//creating the wall of the right
wallRight.position = CGPointMake(CGRectGetMaxX(self.frame), CGRectGetMinY(self.frame))
wallRight.physicsBody = SKPhysicsBody(rectangleOfSize: CGSizeMake(2, self.frame.size.height * 2.0))
wallRight.physicsBody?.dynamic = false
wallRight.physicsBody?.categoryBitMask = objectGroup
self.addChild(wallRight)
//creating the middle wall that objects pass by
wallMiddle.position = CGPointMake(CGRectGetMinX(self.frame), CGRectGetMinY(self.frame))
wallMiddle.physicsBody = SKPhysicsBody(rectangleOfSize: CGSizeMake(self.frame.size.width, 1))
wallMiddle.physicsBody?.dynamic = false
wallMiddle.physicsBody?.categoryBitMask = gapGroup
wallMiddle.physicsBody?.collisionBitMask = gapGroup
wallMiddle.physicsBody?.contactTestBitMask = objectGroup
self.addChild(wallMiddle)
//creating the label
scoreLabel.fontName = "Helvetica"
scoreLabel.fontSize = 60
scoreLabel.text = "0"
scoreLabel.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame) + 70 )
self.addChild(scoreLabel)
var timer = NSTimer.scheduledTimerWithTimeInterval(1, target: self, selector: Selector("randObject"), userInfo: nil, repeats: true)
var timerObjects = NSTimer.scheduledTimerWithTimeInterval(0.01, target: self, selector: Selector("checkObjectPlace"), userInfo: nil, repeats: true)
}
func checkObjectPlace(){
}
//function to randomly choose which object
func randObject(){
if gameOver == 0{
var rand = arc4random_uniform(6)+1
switch(rand){
case 1:
leftObject()
case 2:
middleObject()
case 3:
rightObject()
case 4:
LeftAndMiddleObject()
case 5:
rightAndLeftObject()
case 6:
rightAndMiddleObject()
default:
println("error !! non a number other than 0, 1, 2 has been choosen .")
}
}
}
//function to create the left objects
func leftObject(){
var rand = arc4random_uniform(2) + 1
if rand == 1
{
bigWall.position = CGPointMake(CGRectGetMinX(self.frame) + bigWall.size.width / 2, CGRectGetMaxY(self.frame))
var moveObjects = SKAction.moveByX(0, y: -self.frame.size.height * 2, duration: NSTimeInterval(self.frame.size.height / 100))
var removeObjects = SKAction.removeFromParent()
var moveAndRemoveObjects = SKAction.sequence([moveObjects,removeObjects])
bigWall.runAction(moveAndRemoveObjects)
bigWall.physicsBody = SKPhysicsBody(rectangleOfSize: bigWall.size)
bigWall.physicsBody?.dynamic = false
bigWall.physicsBody?.categoryBitMask = objectGroup
movingObjects.addChild(bigWall)
}
else
{
tallWall.position = CGPointMake(CGRectGetMinX(self.frame) + tallWall.size.width / 2, CGRectGetMaxY(self.frame))
var moveObjects = SKAction.moveByX(0, y: -self.frame.size.height * 2, duration: NSTimeInterval(self.frame.size.height / 100))
var removeObjects = SKAction.removeFromParent()
var moveAndRemoveObjects = SKAction.sequence([moveObjects,removeObjects])
tallWall.runAction(moveAndRemoveObjects)
tallWall.physicsBody = SKPhysicsBody(rectangleOfSize: tallWall.size)
tallWall.physicsBody?.dynamic = false
tallWall.physicsBody?.categoryBitMask = objectGroup
movingObjects.addChild(tallWall)
}
}
//function to create the middle objects
func middleObject(){
var rand = arc4random_uniform(2) + 1
if rand == 1
{
var bigWall = SKSpriteNode(imageNamed: "shortwall")
bigWall.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMaxY(self.frame))
var moveObjects = SKAction.moveByX(0, y: -self.frame.size.height * 2, duration: NSTimeInterval(self.frame.size.height / 100))
var removeObjects = SKAction.removeFromParent()
var moveAndRemoveObjects = SKAction.sequence([moveObjects,removeObjects])
bigWall.runAction(moveAndRemoveObjects)
bigWall.physicsBody = SKPhysicsBody(rectangleOfSize: bigWall.size)
bigWall.physicsBody?.dynamic = false
bigWall.physicsBody?.categoryBitMask = objectGroup
movingObjects.addChild(bigWall)
}
else
{
var tallWall = SKSpriteNode(imageNamed: "tallwall")
tallWall.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMaxY(self.frame))
var moveObjects = SKAction.moveByX(0, y: -self.frame.size.height * 2, duration: NSTimeInterval(self.frame.size.height / 100))
var removeObjects = SKAction.removeFromParent()
var moveAndRemoveObjects = SKAction.sequence([moveObjects,removeObjects])
tallWall.runAction(moveAndRemoveObjects)
tallWall.physicsBody = SKPhysicsBody(rectangleOfSize: tallWall.size)
tallWall.physicsBody?.dynamic = false
tallWall.physicsBody?.categoryBitMask = objectGroup
movingObjects.addChild(tallWall)
}
}
//function to create the right objects
func rightObject(){
var rand = arc4random_uniform(2) + 1
if rand == 1
{
var bigWall = SKSpriteNode(imageNamed: "shortwall")
bigWall.position = CGPointMake(CGRectGetMaxX(self.frame) - bigWall.size.width / 2, CGRectGetMaxY(self.frame))
var moveObjects = SKAction.moveByX(0, y: -self.frame.size.height * 2, duration: NSTimeInterval(self.frame.size.height / 100))
var removeObjects = SKAction.removeFromParent()
var moveAndRemoveObjects = SKAction.sequence([moveObjects,removeObjects])
bigWall.runAction(moveAndRemoveObjects)
bigWall.physicsBody = SKPhysicsBody(rectangleOfSize: bigWall.size)
bigWall.physicsBody?.dynamic = false
bigWall.physicsBody?.categoryBitMask = objectGroup
movingObjects.addChild(bigWall)
}
else
{
var tallWall = SKSpriteNode(imageNamed: "tallwall")
tallWall.position = CGPointMake(CGRectGetMaxX(self.frame) - tallWall.size.width / 2, CGRectGetMaxY(self.frame))
var moveObjects = SKAction.moveByX(0, y: -self.frame.size.height * 2, duration: NSTimeInterval(self.frame.size.height / 100))
var removeObjects = SKAction.removeFromParent()
var moveAndRemoveObjects = SKAction.sequence([moveObjects,removeObjects])
tallWall.runAction(moveAndRemoveObjects)
tallWall.physicsBody = SKPhysicsBody(rectangleOfSize: tallWall.size)
tallWall.physicsBody?.dynamic = false
tallWall.physicsBody?.categoryBitMask = objectGroup
movingObjects.addChild(tallWall)
if ball.position.x == tallWall.position.x{
scoreIncrement()
}
}
}
//function to create a right and left object
func rightAndLeftObject(){
var rand = arc4random_uniform(2) + 1
if rand == 1
{
var bigWall = SKSpriteNode(imageNamed: "shortwall")
var tallWall = SKSpriteNode(imageNamed: "tallwall")
tallWall.position = CGPointMake(CGRectGetMinX(self.frame) + tallWall.size.width / 2, CGRectGetMaxY(self.frame))
bigWall.position = CGPointMake(CGRectGetMaxX(self.frame) - bigWall.size.width / 2, CGRectGetMaxY(self.frame))
var moveObjects = SKAction.moveByX(0, y: -self.frame.size.height * 2, duration: NSTimeInterval(self.frame.size.height / 100))
var removeObjects = SKAction.removeFromParent()
var moveAndRemoveObjects = SKAction.sequence([moveObjects,removeObjects])
bigWall.runAction(moveAndRemoveObjects)
tallWall.runAction(moveAndRemoveObjects)
tallWall.physicsBody = SKPhysicsBody(rectangleOfSize: tallWall.size)
tallWall.physicsBody?.dynamic = false
bigWall.physicsBody = SKPhysicsBody(rectangleOfSize: bigWall.size)
bigWall.physicsBody?.dynamic = false
bigWall.physicsBody?.categoryBitMask = objectGroup
tallWall.physicsBody?.categoryBitMask = objectGroup
movingObjects.addChild(tallWall)
movingObjects.addChild(bigWall)
bigWall.position = CGPointMake(CGRectGetMaxX(self.frame) - bigWall.size.width / 2, CGRectGetMaxY(self.frame))
}
else
{
var bigWall = SKSpriteNode(imageNamed: "shortwall")
var tallWall = SKSpriteNode(imageNamed: "tallwall")
bigWall.position = CGPointMake(CGRectGetMaxX(self.frame) - bigWall.size.width / 2, CGRectGetMaxY(self.frame))
tallWall.position = CGPointMake(CGRectGetMaxX(self.frame) - tallWall.size.width / 2, CGRectGetMaxY(self.frame))
var moveObjects = SKAction.moveByX(0, y: -self.frame.size.height * 2, duration: NSTimeInterval(self.frame.size.height / 100))
var removeObjects = SKAction.removeFromParent()
var moveAndRemoveObjects = SKAction.sequence([moveObjects,removeObjects])
tallWall.physicsBody = SKPhysicsBody(rectangleOfSize: tallWall.size)
tallWall.physicsBody?.dynamic = false
bigWall.physicsBody = SKPhysicsBody(rectangleOfSize: bigWall.size)
bigWall.physicsBody?.dynamic = false
tallWall.runAction(moveAndRemoveObjects)
bigWall.runAction(moveAndRemoveObjects)
bigWall.physicsBody?.categoryBitMask = objectGroup
tallWall.physicsBody?.categoryBitMask = objectGroup
movingObjects.addChild(tallWall)
movingObjects.addChild(bigWall)
}
}
func rightAndMiddleObject(){
var rand = arc4random_uniform(2) + 1
if rand == 1
{
var bigWall = SKSpriteNode(imageNamed: "shortwall")
var tallWall = SKSpriteNode(imageNamed: "tallwall")
tallWall.position = CGPointMake(CGRectGetMaxX(self.frame) - tallWall.size.width / 2, CGRectGetMaxY(self.frame))
bigWall.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMaxY(self.frame))
var moveObjects = SKAction.moveByX(0, y: -self.frame.size.height * 2, duration: NSTimeInterval(self.frame.size.height / 100))
var removeObjects = SKAction.removeFromParent()
var moveAndRemoveObjects = SKAction.sequence([moveObjects,removeObjects])
tallWall.runAction(moveAndRemoveObjects)
bigWall.runAction(moveAndRemoveObjects)
tallWall.physicsBody = SKPhysicsBody(rectangleOfSize: tallWall.size)
tallWall.physicsBody?.dynamic = false
bigWall.physicsBody = SKPhysicsBody(rectangleOfSize: bigWall.size)
bigWall.physicsBody?.dynamic = false
bigWall.physicsBody?.categoryBitMask = objectGroup
tallWall.physicsBody?.categoryBitMask = objectGroup
movingObjects.addChild(tallWall)
movingObjects.addChild(bigWall)
}
else
{
var bigWall = SKSpriteNode(imageNamed: "shortwall")
var tallWall = SKSpriteNode(imageNamed: "tallwall")
bigWall.position = CGPointMake(CGRectGetMidX(self.frame) , CGRectGetMaxY(self.frame))
tallWall.position = CGPointMake(CGRectGetMaxX(self.frame) - tallWall.size.width / 2, CGRectGetMaxY(self.frame))
var moveObjects = SKAction.moveByX(0, y: -self.frame.size.height * 2, duration: NSTimeInterval(self.frame.size.height / 100))
var removeObjects = SKAction.removeFromParent()
var moveAndRemoveObjects = SKAction.sequence([moveObjects,removeObjects])
tallWall.runAction(moveAndRemoveObjects)
bigWall.runAction(moveAndRemoveObjects)
tallWall.physicsBody = SKPhysicsBody(rectangleOfSize: tallWall.size)
tallWall.physicsBody?.dynamic = false
bigWall.physicsBody = SKPhysicsBody(rectangleOfSize: bigWall.size)
bigWall.physicsBody?.dynamic = false
bigWall.physicsBody?.categoryBitMask = objectGroup
tallWall.physicsBody?.categoryBitMask = objectGroup
movingObjects.addChild(tallWall)
movingObjects.addChild(bigWall)
}
}
func LeftAndMiddleObject(){
var rand = arc4random_uniform(2) + 1
if rand == 1
{
var bigWall = SKSpriteNode(imageNamed: "shortwall")
var tallWall = SKSpriteNode(imageNamed: "tallwall")
tallWall.position = CGPointMake(CGRectGetMinX(self.frame) + tallWall.size.width / 2, CGRectGetMaxY(self.frame))
bigWall.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMaxY(self.frame))
var moveObjects = SKAction.moveByX(0, y: -self.frame.size.height * 2, duration: NSTimeInterval(self.frame.size.height / 100))
var removeObjects = SKAction.removeFromParent()
var moveAndRemoveObjects = SKAction.sequence([moveObjects,removeObjects])
tallWall.runAction(moveAndRemoveObjects)
bigWall.runAction(moveAndRemoveObjects)
tallWall.physicsBody = SKPhysicsBody(rectangleOfSize: tallWall.size)
tallWall.physicsBody?.dynamic = false
bigWall.physicsBody = SKPhysicsBody(rectangleOfSize: bigWall.size)
bigWall.physicsBody?.dynamic = false
bigWall.physicsBody?.categoryBitMask = objectGroup
tallWall.physicsBody?.categoryBitMask = objectGroup
movingObjects.addChild(tallWall)
movingObjects.addChild(bigWall)
}
else
{
var bigWall = SKSpriteNode(imageNamed: "shortwall")
var tallWall = SKSpriteNode(imageNamed: "tallwall")
bigWall.position = CGPointMake(CGRectGetMidX(self.frame) , CGRectGetMaxY(self.frame))
tallWall.position = CGPointMake(CGRectGetMinX(self.frame) + tallWall.size.width / 2, CGRectGetMaxY(self.frame))
var moveObjects = SKAction.moveByX(0, y: -self.frame.size.height * 2, duration: NSTimeInterval(self.frame.size.height / 100))
var removeObjects = SKAction.removeFromParent()
var moveAndRemoveObjects = SKAction.sequence([moveObjects,removeObjects])
tallWall.runAction(moveAndRemoveObjects)
bigWall.runAction(moveAndRemoveObjects)
tallWall.physicsBody = SKPhysicsBody(rectangleOfSize: tallWall.size)
tallWall.physicsBody?.dynamic = false
bigWall.physicsBody = SKPhysicsBody(rectangleOfSize: bigWall.size)
bigWall.physicsBody?.dynamic = false
bigWall.physicsBody?.categoryBitMask = objectGroup
tallWall.physicsBody?.categoryBitMask = objectGroup
movingObjects.addChild(tallWall)
movingObjects.addChild(bigWall)
}
}
func scoreIncrement(){
score = score + 1
scoreLabel.text = "\(score)"
}
func didBeginContact(contact: SKPhysicsContact) {
println("contact")
if contact.bodyA.categoryBitMask == gapGroup || contact.bodyB.categoryBitMask == gapGroup {
println("gap contact")
} else {
gameOver = 1
movingObjects.speed = 0
}
}
override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
if gameOver == 0 {
ball.physicsBody?.velocity = CGVectorMake(0, 0)
ball.physicsBody?.applyImpulse(CGVectorMake(70,0))
}
}
override func update(currentTime: NSTimeInterval) {
}
}
该错误表明您正在尝试将一个子节点添加到已经具有父节点的节点上。 堆栈跟踪将您指向leftObject方法。 在这里，您有一个SKAction设置，可以在一个时间间隔内移动，然后从父级移除。
var moveObjects = SKAction.moveByX(0, y: -self.frame.size.height * 2, duration: NSTimeInterval(self.frame.size.height / 100))
var removeObjects = SKAction.removeFromParent()
var moveAndRemoveObjects = SKAction.sequence([moveObjects,removeObjects])
bigWall.runAction(moveAndRemoveObjects)
这会将操作添加到节点并运行，但是您的代码路径将继续向下
movingObjects.addChild(bigWall)
几乎立即。 看起来像一个竞争条件，您认为代码将等到动作完成运行后再继续。
您有一个名为bigWall的实例属性，在大多数方法中，您将创建一个名为bigWall的本地对象并将其添加到场景中。 由于每次调用方法都是一个新对象，效果很好。 但是，在方法leftObject中，您没有本地对象bigWall，因此它引用实例属性。 第一次调用leftObject时，它将可以很好地将实例属性bigWall添加到场景中。 第二次调用该方法时，它将尝试将bigWall实例属性添加到场景中（当场景中已经存在该属性时），在那里您将获得错误。
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