绘制两个圆圈时，实时取景显示奇怪的图像

Question

我需要在iPad上的Swift PlayGrounds中画2个（其中1个我有同样的问题）。但是当它运行时，我有一个非常奇怪的result

class GameScene: SKScene{
var player = SKShapeNode(circleOfRadius: 0.1)
var earth = SKShapeNode(circleOfRadius: 0.01)

override func didMove(to view: SKView){
    //physicsWorld.gravity = CGVector(dx: 0, dy: -0.9)

    player.position = CGPoint(x: self.frame.midX, y: self.frame.midY)

    player.physicsBody?.affectedByGravity = false
    player.physicsBody?.isDynamic = false
    player.physicsBody?.mass = 1

    earth.position = CGPoint(x: self.frame.midX , y: player.position.y - 0.5)
    earth.physicsBody = SKPhysicsBody(circleOfRadius: 20.0)
    earth.physicsBody?.affectedByGravity = false
    earth.physicsBody?.isDynamic = false

    player.fillColor = #colorLiteral(red: 0.9254902005195618, green: 0.23529411852359772, blue: 0.10196078568696976, alpha: 1.0)
    earth.fillColor = #colorLiteral(red: 0.34117648005485535, green: 0.6235294342041016, blue: 0.16862745583057404, alpha: 1.0)

    addChild(earth)
    addChild(player)
}

}

Answer 1

首先，它们很小，也许您不能仅仅因为这个原因而看不到它们。 其次，我想您也需要定义lineWidth和strokeColor。