如何在spritekit tilemap中设置tileset的不透明度？

Question

我有一个代码，可以为tilemap中的每个单个瓦片定义PhysicsBody，如下所示：

func setUpSceneWithMap(map: SKTileMapNode) {

        let tileMap = map
        tileMap.setScale(0.4)

        let startingLocation: CGPoint = tileMap.position
        let tileSize = tileMap.tileSize

        let halfWidth = CGFloat(tileMap.numberOfColumns) / 2.0 * tileSize.width * 0.4
        let halfHeight = CGFloat(tileMap.numberOfRows) / 2.0 * tileSize.height * 0.4

        for col in 0..<tileMap.numberOfColumns {

            for row in 0..<tileMap.numberOfRows {

                if  tileMap.tileDefinition(atColumn: col, row: row) != nil {

                    // defining different types of tile
                    let tileDefinition = tileMap.tileDefinition(atColumn: col, row: row)
                    ...
                    let isTrapTile = tileDefinition?.userData?["isTraps"] as? Bool

                    let x = CGFloat(col) * (tileSize.width) * 0.4 - halfWidth
                    let y = CGFloat(row) * (tileSize.height) * 0.4 - halfHeight

                    let rect = CGRect(x: 0, y: 0, width: tileSize.width * 0.4 , height: tileSize.height * 0.4)
                    let tileNode = SKShapeNode(rect: rect)

                    tileNode.position = CGPoint(x: x + startingLocation.x, y: y + startingLocation.y)
                    tileNode.zPosition = 1
                    tileNode.physicsBody = SKPhysicsBody(edgeLoopFrom: rect)

                    // Create the 4 checkpoint-tiles at the center of the maze
                    ...
                    // Create the wall tile
                    ...
                    // Create the trap tile
                    if (isTrapTile ?? false) {
                        tileNode.physicsBody?.categoryBitMask = gamePhysics.Trap
                        tileNode.physicsBody?.collisionBitMask = 0
                        tileNode.physicsBody?.contactTestBitMask = gamePhysics.Player
                        tileNode.physicsBody?.isDynamic = false
                    }

                    self.addChild(tileNode)

                }
            }
        }
    }

我的tilemap中有3种不同的tile集：Wall，CheckPoint和Trap。通过上面的代码，我为所有对象分配了一个带有Physicalbody的Spritenode。现在，我希望陷阱瓷砖不可见，以便玩家看不到它。最有效的方法是什么？

Answer 1

您将使用myNode.alpha = CGFloat;。这仅影响从SKNode继承的节点。