swift - 为什么我的碰撞/接触在 Swift 中不起作用？

Question

我一直在研究新游戏中的接触/碰撞。我刚刚编写了这个代码，但它无法正常工作。这是我的代码:

广场详细信息:

    square.position = CGPointMake(self.size.width/2, self.size.height/1.5)
    square.zPosition = 35
    square.size = CGSize(width: 40, height: 40)
    square.physicsBody = SKPhysicsBody(rectangleOfSize: square.size)
    square.physicsBody?.affectedByGravity = false
    square.physicsBody?.categoryBitMask = squareGroup
    square.physicsBody?.collisionBitMask = obstacleGroup
    square.physicsBody?.contactTestBitMask = obstacleGroup

    self.addChild(square)

障碍物详细信息(障碍物 1 和 2 相同):

    obstacle1.physicsBody = SKPhysicsBody(rectangleOfSize: obstacle1.size)
    obstacle1.physicsBody?.affectedByGravity = false
    obstacle1.physicsBody?.dynamic = true
    obstacle1.physicsBody?.mass = 10000
    obstacle1.physicsBody?.categoryBitMask = obstacleGroup
    obstacle1.physicsBody?.collisionBitMask = squareGroup
    obstacle1.physicsBody?.contactTestBitMask = squareGroup

这是我的代码，用于他们和类别组之间的联系:

var squareGroup : UInt32 = 0x1 << 0
var obstacleGroup : UInt32 = 0x1 << 1     

func didBeginContact(contact: SKPhysicsContact) {

        var firstBody = SKPhysicsBody()
        var secondBody = SKPhysicsBody()

        if contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask {
            firstBody = contact.bodyA
            secondBody = contact.bodyB
        }
        else {
            firstBody = contact.bodyB
            firstBody = contact.bodyA
        }



        if firstBody.categoryBitMask == 1 && secondBody.categoryBitMask == 2{
            let newScene = GameScene(size: self.size)
           _ = SKTransition.fadeWithDuration(1)
            self.view?.presentScene(newScene)
        }
    }

如果有人能帮助我那就太好了。在评论中提问。

Answer 1

if contact.bodyA.categoryBitMask < contact.bodyB.categoryBitMask {
        firstBody = contact.bodyA
        secondBody = contact.bodyB
    }
    else {
        firstBody = contact.bodyB
        firstBody = contact.bodyA
    }

在 else 语句中，您有 firstBody = contact.bodyB 和 firstBody = contact.bodyA

I think you whanted to write secondBody = contact.bodyA

还添加双重检查联系

if (firstBody.categoryBitMask == 0x1 << 1 && secondBody.categoryBitMask == 2) || (firstBody.categoryBitMask == 0x1 << 2 && secondBody.categoryBitMask == 1){

    //enter code here
}