Ios 以编程方式为精灵在帧内创建区域

我有一个精灵球，我只想在一个正方形区域内反弹

如何在主框架内以渐进方式创建此方形区域，而不是像代码片段中那样约束整个框架：

let borderBody = SKPhysicsBody(edgeLoopFromRect: self.frame)
borderBody.friction = 0
self.physicsBody = borderBody

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请尝试此代码段。它使用SKPhysicsBody创建一个SKNode。然后可以将精灵放置在此节点中：

    // Create a boundary rectangle. Adjust with your size:
    let boundary = CGRect(x: 100, y: 100, width: 100, height: 100)

    // Create a boundary node
    let boundaryNode = SKNode()

    // Create the PhysicsBody and assign it to the node
    let borderBody = SKPhysicsBody(edgeLoopFromRect: boundary)
    borderBody.friction = 0
    boundaryNode.physicsBody = borderBody

    // Add boundary node to the scene
    self.addChild(boundaryNode)

    // Add your Sprite to the boundaryNode
    boundaryNode.addChild(yoursprite)

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请尝试此代码段。它使用SKPhysicsBody创建一个SKNode。然后可以将精灵放置在此节点中：

    // Create a boundary rectangle. Adjust with your size:
    let boundary = CGRect(x: 100, y: 100, width: 100, height: 100)

    // Create a boundary node
    let boundaryNode = SKNode()

    // Create the PhysicsBody and assign it to the node
    let borderBody = SKPhysicsBody(edgeLoopFromRect: boundary)
    borderBody.friction = 0
    boundaryNode.physicsBody = borderBody

    // Add boundary node to the scene
    self.addChild(boundaryNode)

    // Add your Sprite to the boundaryNode
    boundaryNode.addChild(yoursprite)