Question

我需要使用ShapeBody添加简单的线来进行交互。我正在尝试下面的代码，Xcode给了我下一个回复：

PhysicsBody：无法创建物理体。

        let testPath = UIBezierPath()
        testPath.move(to: CGPoint(x:-100, y: 200))
        testPath.addLine(to: CGPoint(x:100, y: 200))

        let testShape = SKShapeNode()
        testShape.path = testPath.cgPath
        testShape.position = CGPoint(x:0, y:250)
        testShape.zPosition = 5
        testShape.lineWidth = 5
        testShape.strokeColor = .red
        testShape.physicsBody = SKPhysicsBody(polygonFrom: testPath.cgPath)

Answer 1

使用edgeChainFrom而不是polygonFrom，它可以工作！

testShape.physicsBody = SKPhysicsBody(edgeChainFrom: testPath.cgPath)

Answer 2

路径不能与SKPhysicsBody的任何线相交，你的线需要是一个细长的矩形

    let testPath = UIBezierPath()
    testPath.move(to: CGPoint(x:-100, y: 200))
    testPath.addLine(to: CGPoint(x:100, y: 200))
    testPath.addLine(to: CGPoint(x:100, y: 201))
    testPath.addLine(to: CGPoint(x:-100, y: 201))
    testPath.close()
    let testShape = SKShapeNode()
    testShape.path = testPath.cgPath
    testShape.position = CGPoint(x:0, y:250)
    testShape.zPosition = 5
    testShape.lineWidth = 5
    testShape.strokeColor = .red
    testShape.physicsBody = SKPhysicsBody(polygonFrom: testPath.cgPath)

使用PhysicsBody和SKShapenode线。 Swift，iOS，SpriteKit

2 个答案: