Ios 雪碧套件与xcode重叠滞后

所以我只是想了解一下Sprite工具包是如何工作的，有一件事我不明白，为什么我的演示会在同一个Sprite的多个版本相互重叠时出现延迟

基本上，我做的是创建一个继承SKSpriteNode的类，并在init上设置以下属性

    marioCategory = 1 << 1;
    wallCategory = 1 << 2;
    platformCategory = 1 << 3;
    self.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:self.size];
    self.physicsBody.density = 1.0;
    self.physicsBody.angularDamping = 0.0;
    self.physicsBody.linearDamping = 0.0;
    self.physicsBody.friction = 0.0;
    self.physicsBody.categoryBitMask = marioCategory;
    self.physicsBody.collisionBitMask =  platformCategory ;
    self.physicsBody.contactTestBitMask =   wallCategory  ;
    self.physicsBody.dynamic = YES;
    self.physicsBody.allowsRotation = NO;
    self.physicsBody.restitution = 0;
    self.name = @"Mario";

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你在联系人代理方法中记录了什么吗？当两个Mario重叠时，代理方法甚至不会被调用，只有当它撞到墙上时才会被调用，这就是我想要的——有很多“多个版本”同时重叠？我在屏幕上有30个，但很难判断延迟是何时发生的，看起来当大约6个或更多的精灵相互重叠时，我刚刚看了它，当屏幕上有14个精灵，两组7个精灵重叠时，滞后是很糟糕的

    node.position = CGPointMake(x, y);
    node.physicsBody = [SKPhysicsBody bodyWithRectangleOfSize:node.size];
    node.physicsBody.angularDamping = 0.0;
    node.physicsBody.linearDamping = 0.0;
    node.physicsBody.friction = 0.0;
    node.physicsBody.affectedByGravity = NO;
    node.physicsBody.categoryBitMask = platformCategory;
    node.physicsBody.collisionBitMask = 0  ;
    node.physicsBody.contactTestBitMask = 0 ;
    node.physicsBody.dynamic = NO;