swift - 如何在某个位置随机选择一个节点？

Question

我有五个不同颜色的圆圈，每个圆圈都在同一个函数中调用，但具有不同的物理体和名称。我希望它们全部从屏幕底部向上移动，一次只有一个节点在屏幕上从一个设定位置(即 CGPointMake(100, -500))生成随机颜色节点后，在 4几秒后会出现一个不同的随机选择的？

有没有办法让所有的人都被单独识别并做到这一点？

代码:

      func circles() {

     let sprites = SKSpriteNode(imageNamed: "Circle1")
       sprites.position = CGPointMake(45, -200)

        sprites.physicsBody = SKPhysicsBody(circleOfRadius: 40)
        sprites.physicsBody?.dynamic = true
        sprites.physicsBody?.affectedByGravity = false
        sprites.physicsBody?.categoryBitMask = BodyType.player.rawValue
        sprites.physicsBody?.contactTestBitMask = BodyType.enemy.rawValue | BodyType.other.rawValue | BodyType.seven.rawValue | BodyType.nine.rawValue | BodyType.five.rawValue

        sprites.size = CGSizeMake(45, 45)
        all.addChild(sprites)
        let sprite2 = SKSpriteNode(imageNamed: "Circle2")
        sprite2.position = CGPointMake(60, -750)
        sprite2.physicsBody = SKPhysicsBody(circleOfRadius: 40)
        sprite2.physicsBody?.categoryBitMask = BodyType.eight.rawValue
        sprite2.physicsBody?.contactTestBitMask = BodyType.nine.rawValue | BodyType.other.rawValue | BodyType.five.rawValue | BodyType.enemy.rawValue | BodyType.seven.rawValue
        sprite2.physicsBody?.dynamic = true
        sprite2.physicsBody?.affectedByGravity = false

        sprite2.size = CGSizeMake(45, 45)
         addChild(sprite2)
        let sprite3 = SKSpriteNode(imageNamed: "circle3")
        sprite3.position = CGPointMake(100, -1200)
        sprite3.physicsBody = SKPhysicsBody(circleOfRadius: 40)
        sprite3.physicsBody?.categoryBitMask = BodyType.six.rawValue
        sprite3.physicsBody?.contactTestBitMask = BodyType.seven.rawValue | BodyType.other.rawValue | BodyType.five.rawValue | BodyType.enemy.rawValue | BodyType.nine.rawValue
        sprite3.physicsBody?.dynamic = true
        sprite3.physicsBody?.affectedByGravity = false

        sprite3.size = CGSizeMake(45, 45)
        addChild(sprite3)
        let sprite4 = SKSpriteNode(imageNamed: "Circle4")
        sprite4.position = CGPointMake(150, -1400)
        sprite4.physicsBody = SKPhysicsBody(circleOfRadius: 40)
        sprite4.physicsBody?.categoryBitMask = BodyType.ground.rawValue
        sprite4.physicsBody?.contactTestBitMask = BodyType.other.rawValue | BodyType.player.rawValue | BodyType.five.rawValue | BodyType.enemy.rawValue | BodyType.seven.rawValue
        sprite4.physicsBody?.dynamic = true
        sprite4.physicsBody?.affectedByGravity = false

        sprite4.size = CGSizeMake(45, 45)
        addChild(sprite4)
        let sprite5 = SKSpriteNode(imageNamed: "Circle5")
        sprite5.position = CGPointMake(200, -850)
        sprite5.physicsBody = SKPhysicsBody(circleOfRadius: 40)
        sprite5.physicsBody?.categoryBitMask = BodyType.ya.rawValue
        sprite5.physicsBody?.contactTestBitMask = BodyType.five.rawValue | BodyType.player.rawValue | BodyType.other.rawValue | BodyType.seven.rawValue | BodyType.nine.rawValue


        sprite5.physicsBody?.dynamic = true
        sprite5.physicsBody?.affectedByGravity = false
        sprite5.size = CGSizeMake(45, 45)
        addChild(sprite5)
          }

非常感谢帮助。

Answer 1

您可以使用 SKNode 的名称属性。

来自documentation :

Used to assign a name to a node for later reference. When choosing a name for a node, you should decide whether each node gets a unique name or whether some nodes will share a common name. If you give the node a unique name, you can find the node later by calling the childNodeWithName: method. If a name is shared by multiple nodes, the name usually means that these are all a similar object type in your game. In this case, you can iterate over those objects by calling the enumerateChildNodesWithName:usingBlock: method.