January 2020
Intermediate to advanced
356 pages
6h 4m
Chinese
Content preview from Swift游戏开发经典实例
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物理学
｜
231
physicsSprite.physicsBody?.contactTestBitMask = myObjectBitMask;
这样，当有物体发生碰撞，就会调用到
didBegin
和
didEnd
方法。
讨论
当我们想让某个对象接收其他对象的碰撞通知时，我们需要让该对象实现
SKPhysicsContactDelegate
协议，然后将场景的
physicsWorld
的
contactDelegate
属性设置为这个对象。
SKPhysicsContactDelegate
协议定义了两个方法：
didBegin(contact:)
方法和
didEnd(contact:)
方
法，这两个方法在两个
contactTestBitMask
属性存在相交（即
对二者的
contactTestBitMask
进行或运算，不为
0
表示这两者可以产生碰撞）的
物体发生相交时被调用。
碰撞检测掩码
contactTestBitMask
用于定义物体的类型。默认情况下，它是
0
，
也就是说这种物体不属于任何碰撞检测的类型。
SKPhysicsContactDelegate
协议的方法带有一个
SKPhysicsContact
对象参数。这
个
SKPhysicsContact
对象包含了一次碰撞的相关信息，例如发生碰撞的物体是哪
个，它们发生碰撞的位置，以及力的大小。
7.12
查找物体
问题
我们想查找某个场景中的某个物体。
解决方案
在物理世界中查找
SKPhysicsBody
对象，可以使用
enumerateBodies(in:,
using:) ...
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