SKPhysicsBody的malloc錯誤

我創建了一個名爲的SKSpriteNodeObstacle子類，並在init實現物理體：SKPhysicsBody的malloc錯誤

-(id)initWithHeight:(NSInteger)height flipped:(BOOL)flipped 
{ 
if (self = [super initWithImageNamed: @"obstacle.png"]) 
{ 
    [self setName: @"obstacle"]; 
    [self setSize: CGSizeMake(OBSTACLE_WIDTH, height)]; 
    [self setPosition: CGPointZero]; 
    // rotate if needed 
    if (flipped) 
    { 
     [self runAction: [SKAction rotateByAngle: 3.14 duration: 0.0f]]; 

    } 

    // physics 
    SKPhysicsBody* pb = [SKPhysicsBody bodyWithRectangleOfSize: self.size]; 
    pb.dynamic = NO; 
    pb.affectedByGravity = NO; 
    [pb setCategoryBitMask: obstacleCategory]; 
    [pb setContactTestBitMask: playerCategory]; 
    [self setPhysicsBody: pb]; 
} 
return self; 
}

然後在我的場景我有一次曾經幾秒鐘產卵2個障礙的方法。

Obstacle *ob0 = [[Obstacle alloc] initWithHeight: h0 flipped: NO]; 
[bottom setPosition: CGPointMake(x0, y0)]; 

Obstacle *ob1 = [[Obstacle alloc] initWithHeight: h1 flipped: YES]; 
[top setPosition: CGPointMake(x1, y1)]; 

NSArray* objs = @[ob0, ob1]; 

for (Obstacle* o in objs) 
{ 
    [self addChild: o]; 
    [o runAction: [SKAction 
         moveToX: -OBSTACLE_WIDTH duration: SPAWN_SPEED*2] 
      completion:^{ 
       [o removeFromParent]; 
      }]; 
}

一段隨機時間（幾秒鐘，幾分鐘之間）運行後，應用程序將與

malloc: *** error for object 0x16553120: pointer being freed was not allocated

崩潰的錯誤被第一塊扔到下面的行代碼

SKPhysicsBody* pb = [SKPhysicsBody bodyWithRectangleOfSize: self.size];

我已經試過移動的物理實現了子類和到現場Obstacle實例化後，卻拋出了同樣的錯誤。

編輯：

調試器給了我新的認識到我的問題：

*** Terminating app due to uncaught exception 'Cant add body, 
already exists in a world', reason: 'Cant add body <SKPhysicsBody> 
type:<Rectangle> representedObject:[<SKSpriteNode> name:'obstacle' 
texture:[<SKTexture> 'obstacle.png' (50 x 200)] position:{400, 446} 
size:{50, 244} rotation:0.00], already exists in a world'

做SKPhysicsNode的需要有一個獨特的名字，也許？

來源

2014-02-13 Chris

我找到了解決方案！因爲我正在爲高度生成一個隨機數，並從視圖的高度減去另一個障礙物的高度，有時高度是一個負值，這會導致創建物理體的錯誤。我希望這可以幫助其他人下線，因爲我整天都在敲我的腦袋

來源

2014-02-13 16:09:41 Chris

SKPhysicsBody的malloc錯誤

回答

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