ios - 随机生成节点

Question

class GameScene: SKScene {

let balls = [
    SKSpriteNode(imageNamed: "blueball.png"),
    SKSpriteNode(imageNamed: "greenball.png"),
    SKSpriteNode(imageNamed: "realredball.png"),
]

override func didMove(to view: SKView) {

    spawnBalls()

}

override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        for ball in balls{
            ball.physicsBody = SKPhysicsBody()
            ball.physicsBody?.affectedByGravity = true


        }
}

func spawnBalls() {
   for ball in balls{
    balls[Int(arc4random_uniform(UInt32(balls.count)))]

    ball.position = CGPoint(x: 0, y: 250)
    ball.size = CGSize(width: 70, height: 70)
        self.addChild(ball)
    }
}

}

每次我的应用程序加载时都会生成红球，但它应该随机生成红球、蓝球或绿球。起初，它确实有效，会随机生成红色、绿色或蓝色，我不知道我是否不小心更改了某些内容，但在过去两天它只是生成红色的。如果有人能帮忙，那就太好了.谢谢。

Answer 1

您实际上并没有对 spawnBalls 中的随机球做任何事情。试试这个

func spawnBalls() {

    let ball = balls[Int(arc4random_uniform(UInt32(balls.count)))]
    ball.position = CGPoint(x: 0, y: 250)
    ball.size = CGSize(width: 70, height: 70)
    self.addChild(ball)
}