在另一个循环内的循环中添加SKSpriteNode实例

这是我正在沙盒应用程序中使用SpriteKit进行的代码实验。

这是代码,但当我运行它时会崩溃。如果这一批要减少到1投,那么它就可以工作了。另外,如果我怀疑这与等待延迟和添加“石头”spritenode有关,但不确定是什么。

for x in 1 ... 2 {

if x == 1 {

intStartIndex = 1
intEndIndex = 3

    } else { 

intStartIndex = 4
intEndIndex = 5

    }

            run(SKAction.wait(forDuration: dblDelay)) {

                for i in intStartIndex ... intEndIndex { 
                    print(i)
                    self.stone[i - 1].position = CGPoint(x: 0 , y: -100)
                    self.stone[i - 1].anchorPoint = CGPoint(x: 0.5, y: 0.5)
                    self.stone[i - 1].size = CGSize(width: 50, height: 50)
                    self.stone[i - 1].zPosition = 2
                    self.addChild(self.stone[i - 1])   

                    let actionMove = SKAction.move(to: CGPoint(x: 0, y: 0), duration: 0.3)
                    let actionRolling = SKAction.animate(with: stone[i - 1].arrayTexture, timePerFrame: 0.05)
                    let actionSequence = SKAction.sequence([actionMove,actionRolling])
                    stone[i - 1].run(actionSequence)


                }

            }
                dblDelay += 0.5
        }