问题描述
在SpriteKit中，我们在didBeginContact方法中检测到了.但这看起来有点愚蠢:func didBeginContact(contact:SKPhysicsContact){
in SpriteKit we detect the in the didBeginContact method.but this looks a bit stupid to do something like that:func didBeginContact(contact: SKPhysicsContact) {
if let contactA = contact.bodyA.node?.name {
if let contactB = contact.bodyB.node?.name {
//now that we have safely unwrapped these nodes, we can operate on them
if contactA == "ball" {
collisionBetweenBall(contact.bodyA.node!, object: contact.bodyB.node!)
} else if contactB == "ball" {
collisionBetweenBall(contact.bodyB.node!, object: contact.bodyA.node!)
}
}
}
}
有什么方法可以确保bodyA始终是球吗?有没有与categorybitmask相关的规则?
is there any way I can ensure that bodyA is always a ball? is there any rules related to categorybitmask?
推荐答案
如果您使用的是简单类别，并且每个物理主体仅属于一个类别，则didBeginContact的这种替代形式可能更易读:
If you are using simple categories, with each physics body belonging to only one category, then this alternative form of didBeginContact may be more readable:
func didBeginContact(contact: SKPhysicsContact) {
let contactMask = contact.bodyA.categoryBitMask | contact.bodyB.categoryBitMask
switch contactMask {
case categoryBitMask.ball | categoryBitMask.something:
print("Collision between ball and something")
let ballNode = contact.bodyA.categoryBitMask == categoryBitMask.ball ? contact.bodyA.node! : contact.bodyB.node!
ballNode.pop()
score += 10
default :
//Some other contact has occurred
print("Some other contact")
}
}
请注意，如果您的类别比较复杂，则将无法使用，因为简单的AND测试( categoryBitMask.ball | categoryBitMask.something )将不匹配.
Note that if your categories are more complicated, this won't work as the simple AND tests (categoryBitMask.ball | categoryBitMask.something) won't match.
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