Swift SpriteKit：对象彼此位于下方

我的游戏中有两辆坦克，一辆红色，一辆蓝色

我已经确定了他们的身体，但他们不是互相撞击，而是在对方下面

物理分类：

struct physicsCategory {
    static let Bullet : UInt32 = 0x1 << 0
    static let Enemy : UInt32 = 0x1 << 1
    static let MainTank : UInt32 = 0x1 << 2
    static let EnemyTank : UInt32 = 0x1 << 3
}

红色坦克：

enemyTank = SKSpriteNode(imageNamed: "tank_red")
enemyTank.size = CGSize(width: 76, height: 92)
enemyTank.name = "enemyTank"
enemyTank.zPosition = 0
enemyTank.physicsBody = SKPhysicsBody(rectangleOf: enemyTank.size)
enemyTank.physicsBody?.categoryBitMask = physicsCategory.EnemyTank
enemyTank.physicsBody?.collisionBitMask = physicsCategory.Enemy
enemyTank.physicsBody?.contactTestBitMask = physicsCategory.MainTank

enemyTank.physicsBody?.isDynamic = false

换线就行了

enemyTank.physicsBody?.collisionBitMask = physicsCategory.Enemy

到

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我很确定你们必须将enemyTank的冲突位掩码设置为MainTank@Muffinman2497，那么你能纠正我吗？

enemyTank.physicsBody?.collisionBitMask = physicsCategory.Enemy

enemyTank.physicsBody?.collisionBitMask = physicsCategory.MainTank