Question

有一枚硬币，它只能与玩家发生碰撞而不能推动它。相反，玩家（手指）被推下并与一切相撞。这是代码：

var coin=SKSpriteNode(imageNamed: "Coin")
coin.position=CGPoint(x: xPos, y: yPos)
coin.physicsBody=SKPhysicsBody(circleOfRadius: 250)
//coin.physicsBody!.mass=CGFloat(mass);
coin.xScale=1
coin.yScale=1

coin.name="coin";
coin.physicsBody?.contactTestBitMask=1
coin.physicsBody!.collisionBitMask=0
coin.physicsBody!.categoryBitMask=0

self.addChild(coin)

以下是玩家的设置：

Finger.physicsBody?.collisionBitMask=0;
Finger.physicsBody?.categoryBitMask=0;
Finger.physicsBody?.contactTestBitMask=1

Answer 1

问题是硬币的collisionBitMask被设置为播放器的categoryBitMask。让我为你揭开三个碰撞变量的神秘面纱：

x.categoryBitMask：这是一种给对象＆＃34; x＆＃34;识别它的方法。

x.collisionBitMask：在这里，您将放置所需对象的categoryBitMask var＆＃34; x＆＃34;能够与（崩溃）合并

x.contactTestBitMask：在这里，当您与＆＃34; x＆＃34;进行联系时，您将放置要为其执行操作的对象的categoryBitMask var。 contactTestBitMask将调用apple提供的函数＆＃34; didBeginContact＆＃34;，在那里你可以编写你想要在硬币触及播放器时发生的事情。

一些代码可以帮助您将各个部分组合在一起：

var coinCategory: UInt32 = 1 // categories must be type UInt32
var playerCategory: UInt32 = 2
var nothingCategory: UInt32 = 3 // some other number for not colliding into anything

coin.name="coin";
coin.physicsBody!.categoryBitMask= coinCategory // set category first
coin.physicsBody?.contactTestBitMask = playerContact
coin.physicsBody!.collisionBitMask = nothingCategory // doesn't crash into anything. 
// if you want coins to crash into each other then set their collisionBitMask to the coinCategory  


self.addChild(coin)

和

Finger.physicsBody?.categoryBitMask= playerCategory;
Finger.physicsBody?.collisionBitMask= nothingCategory;

// This next one only needs to be set on one of the objects when you want the "didBeginContact" function to be called when there is contact
//Finger.physicsBody?.contactTestBitMask = coinCategory

祝你好运！

Answer 2

最佳做法是不对位掩码使用整数值：

var coinCategory: UInt32 = 0x1 << 1 
var playerCategory: UInt32 = 0x1 << 2
var nothingCategory: UInt32 = 0x1 << 3

位掩码不起作用。 SpriteKit Swift

2 个答案: