我正在尝试制作一个简单的游戏，它在随机的地方显示随机的形状，但游戏运行，没有任何反应，我不知道为什么，请帮助。 而且没有错误。 addchild（）有函数，removempromparent函数有函数（） 起初我没有removefromparent（），但游戏会崩溃，并会给我这个错误。
2015-07-06 22:34:26.452 Shapes[8441:4672856] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Attemped to add a SKNode which already has a parent: <SKSpriteNode> name:'(null)' texture:[<SKTexture> 'square' (150 x 150)] position:{883, 768} size:{150, 100} rotation:0.00'
*** First throw call stack:
(
0 CoreFoundation 0x000000010d55d3f5 __exceptionPreprocess + 165
1 libobjc.A.dylib 0x000000010f484bb7 objc_exception_throw + 45
2 CoreFoundation 0x000000010d55d32d +[NSException raise:format:] + 205
3 SpriteKit 0x000000010e059af6 -[SKNode addChild:] + 111
4 Shapes 0x000000010d372ae4 _TFC6Shapes9StartGame9addSquarefS0_FV12CoreGraphics7CGFloatT_ + 276
5 Shapes 0x000000010d372633 _TFC6Shapes9StartGame11creatShapesfS0_FT_T_ + 5267
6 Shapes 0x000000010d372852 _TToFC6Shapes9StartGame11creatShapesfS0_FT_T_ + 34
7 Foundation 0x000000010dbd3fd4 __NSFireTimer + 83
8 CoreFoundation 0x000000010d4c54e4 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 20
9 CoreFoundation 0x000000010d4c50a5 __CFRunLoopDoTimer + 1045
10 CoreFoundation 0x000000010d4883dd __CFRunLoopRun + 1901
11 CoreFoundation 0x000000010d487a06 CFRunLoopRunSpecific + 470
12 GraphicsServices 0x00000001148f09f0 GSEventRunModal + 161
13 UIKit 0x000000010e1e0550 UIApplicationMain + 1282
14 Shapes 0x000000010d37532e top_level_code + 78
15 Shapes 0x000000010d37536a main + 42
16 libdyld.dylib 0x000000010fc73145 start + 1
17 ??? 0x0000000000000001 0x0 + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)
// StartGame.swift
// Shapes
//
// Created by naeim on 6/29/15.
// Copyright (c) 2015 naeim. All rights reserved.
//
import UIKit
import SpriteKit
import Darwin
class StartGame: SKScene {
var scoreLabel = SKLabelNode(fontNamed: "cholkDuster")
var square = SKSpriteNode(imageNamed: "square")
var circle = SKSpriteNode(imageNamed: "circle")
var rectangle = SKSpriteNode(imageNamed: "rectangle")
var triangle = SKSpriteNode(imageNamed: "triangle")
let bg = SKSpriteNode(imageNamed: "background.png")
var score = 0
override func didMoveToView(view: SKView) {
/* Setup your scene here */
// ********************
//declaring the shapes
// ********************
//random number for the shapes
var timecreatShapes = NSTimer.scheduledTimerWithTimeInterval(3, target: self, selector: Selector("creatShapes"), userInfo: nil, repeats: true)
//background image
bg.position = CGPoint(x: CGRectGetMidX(self.frame), y:CGRectGetMidY(self.frame))
bg.size.width = self.frame.size.width
bg.size.height = self.frame.size.height
self.addChild(bg)
self.scoreLabel.text = "0"
self.scoreLabel.fontSize = 42
self.scoreLabel.position = CGPoint(x: CGRectGetMidX(self.frame) , y: CGRectGetMidY(self.frame))
self.addChild(scoreLabel)
scoreLabel.zPosition = 2
self.physicsWorld.gravity = CGVectorMake(0, -0.5)
}
func creatShapes (){
square.size = CGSize(width: 150, height: 100)
square.color = SKColor.redColor()
square.physicsBody = SKPhysicsBody(circleOfRadius: square.size.height / 2)
square.physicsBody?.dynamic = true
square.physicsBody?.allowsRotation = false
square.zPosition = 10
//declaring a circle image
circle.size = CGSize(width: 150, height: 100)
circle.physicsBody = SKPhysicsBody(circleOfRadius: square.size.height / 2)
circle.physicsBody?.dynamic = true
circle.physicsBody?.allowsRotation = false
circle.zPosition = 10
//declaring a triangle
triangle.size = CGSize(width: 150, height: 100)
triangle.physicsBody = SKPhysicsBody(circleOfRadius: square.size.height / 2)
triangle.physicsBody?.dynamic = true
triangle.physicsBody?.allowsRotation = false
triangle.zPosition = 10
//declaring rectangle
rectangle.size = CGSize(width: 150, height: 100)
rectangle.physicsBody = SKPhysicsBody(circleOfRadius: square.size.height / 2)
rectangle.physicsBody?.dynamic = true
rectangle.physicsBody?.allowsRotation = false
rectangle.zPosition = 10
var x = Int ( arc4random_uniform(4) + 1)
var a = CGFloat( arc4random_uniform(900) + 100)
switch(x){
case 1:
addCircle(a)
removeCircle()
case 2:
addSquare(a)
removeSquare()
case 3:
addRectangle(a)
removeRectangle()
case 4:
addTriangle(a)
removeTriangle()
default:
println("kadjaksd")
}
println(x)
println(a)
}
//adding functions
func addCircle(rand : CGFloat)
{
var a = rand
circle.position = CGPoint (x: a , y: self.frame.size.height)
self.addChild(circle)
}
func addSquare(rand : CGFloat)
{
var a = rand
square.position = CGPoint(x: a , y: self.frame.size.height)
self.addChild(square)
}
func addRectangle(rand : CGFloat)
{
var a = rand
rectangle.position = CGPoint(x: a , y: self.frame.size.height)
}
func addTriangle(rand : CGFloat)
{
var a = rand
triangle.position = CGPoint(x: a , y: self.frame.size.height)
}
//removing functions
func removeCircle()
{
self.circle.removeFromParent()
}
func removeSquare()
{
self.square.removeFromParent()
}
func removeRectangle()
{
self.triangle.removeFromParent()
}
func removeTriangle()
{
self.triangle.removeFromParent()
}
override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
/* Called when a touch begins */
for touch: AnyObject in touches {
let location = touch.locationInNode(self)
if (self.nodeAtPoint(location) == self.square || self.nodeAtPoint(location) == self.triangle || self.nodeAtPoint(location) == self.circle || self.nodeAtPoint(location) == self.rectangle){
self.score++
}
self.scoreLabel.text = String(self.score)
}
}
}
答案 0 :(得分：2)
问题是你要两次添加一个节点。这就是为什么它说＆＃34;尝试添加已经拥有父节点的节点。＆＃34;你可能有两次这样的事情：
self.addChild(square)
您只能添加一个节点。问题是您将square声明为全局变量，因此每次运行createShapes函数时都会添加它。要解决此问题，请将square声明为局部变量，以便每次运行函数时都创建新引用，而不是只有一个引用。如果您遇到其他节点的此问题，您可以采用相同的方式修复它。计时器每三秒运行一次creteShapes，这就是你需要将square声明为局部变量的原因。快乐的编码。