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func initializeBorederBlocks() {

    let upperBorderBlock: SKFieldNode = SKFieldNode.linearGravityField(withVector: vector3(0, -5, 0))

    upperBorderBlock.region = SKRegion(size: CGSize(width: self.frame.size.width, height: -10))
    upperBorderBlock.position = CGPoint(x: self.frame.size.width / 2, y: self.frame.size.height)
    upperBorderBlock.falloff = 2
    upperBorderBlock.strength = -100
    upperBorderBlock.categoryBitMask = PhysicsCategory.upperBorder.rawValue
//upperBorderBlock.isExclusive = true

    let lowerBorderBlock: SKFieldNode = SKFieldNode.linearGravityField(withVector: vector3(0, 5, 0))

    lowerBorderBlock.region = SKRegion(size: CGSize(width: self.frame.size.width, height: 10))
    lowerBorderBlock.position = CGPoint(x: self.frame.size.width / 2, y: 0)
    lowerBorderBlock.falloff = 2
    lowerBorderBlock.strength = -100
    lowerBorderBlock.categoryBitMask = PhysicsCategory.lowerBorder.rawValue
//lowerBorderBlock.isExclusive = true

    let leftBorderBlock: SKFieldNode = SKFieldNode.linearGravityField(withVector: vector3(5, 0, 0))

    leftBorderBlock.region = SKRegion(size: CGSize(width: 10, height: self.frame.size.height))
    leftBorderBlock.position = CGPoint(x: 0, y: self.frame.size.height / 2)
    leftBorderBlock.falloff = 2
    leftBorderBlock.strength = -100
    leftBorderBlock.categoryBitMask = PhysicsCategory.leftBorder.rawValue
//leftBorderBlock.isExclusive = true

    let rightBorderBlock: SKFieldNode = SKFieldNode.linearGravityField(withVector: vector3(-5, 0, 0))

    rightBorderBlock.region = SKRegion(size: CGSize(width: -10, height: self.frame.size.height))
    rightBorderBlock.position = CGPoint(x: self.frame.size.width, y: self.frame.size.height / 2)
    rightBorderBlock.falloff = 2
    rightBorderBlock.strength = -100
    rightBorderBlock.categoryBitMask = PhysicsCategory.rightBorder.rawValue
//rightBorderBlock.isExclusive = true

    self.addChild(upperBorderBlock)
    self.addChild(lowerBorderBlock)
    self.addChild(leftBorderBlock)
    self.addChild(rightBorderBlock)
}

通过这个函数，我试图初始化围绕我的屏幕边缘的四个 SKFieldNode 并向内施加一个力。这样，没有物体会粘在边缘。但是，当我确实将一个物体撞到屏幕边缘时，它只会坐在那里，感觉不到排斥力。我已将它们的 categoryBitMask 添加到对象的 collisionTestBitMask 中，因此它知道要击中它们。此外，随着节点数增加四个，它们也在现场。他们的位置、场强或矢量箭头有问题吗？

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