这是一个有趣的问题，但我一直在尝试复制这个背景效果here (brawl stars)，图标填充背景，并以特定的速度在屏幕外的选定方向移动。
我已经能够初始化背景图块/图标，使其在视图加载时立即显示，但是我无法定时新的图块/图标，使其在正确的时间以正确的速度出现。我也不知道这是否是最好的方法，这只是代表了我在混乱中试图复制这种行为的微弱尝试。
欢迎提出任何建议或想法。

func initializeBackgroundTiles()
{
    let itemsPerRow = 4

    let itemHeight = self.frame.width / 7
    let widthBetween = (itemHeight * 2) / 5
    let columnHeight = widthBetween * 4
    
    for column in 0...10 {
        
        for row in 0...5 {
            
            let columnPosition = (columnHeight * CGFloat(column))
            
            let xCalc = CGFloat(
                -(itemHeight + widthBetween) // one row to the left as well
                + (itemHeight * Double(row) + (widthBetween * Double(row))))
            
            let yCalc = (((self.frame.height - itemHeight) - columnPosition * 2) +
                         ((row % 2 == 1 ? columnHeight : 0)))
                    
            let tileSubview = CustomImageView(frame: CGRect(
                x: xCalc,
                y: yCalc,
                width: itemHeight,
                height: itemHeight))
            
            tileSubview.image = UIImage(named: "lightBand")!.withTintColor(.white)
            tileSubview.alpha = 0.04
            ContentView.addSubview(tileSubview)
            
            UIView.animate(withDuration: 30, delay: 0, options: [.curveLinear]) {
                
                let newX = ((itemHeight * Double(row)) + (widthBetween * Double(row))) + widthBetween * 3
                let newY = 0 - ((itemHeight + (row % 2 == 0 ? columnHeight : 0)) + columnPosition * 2)
                
                tileSubview.frame = CGRect(
                    x: newX,
                    y: newY,
                    width: itemHeight,
                    height: itemHeight
                )
            } completion: { completed in
                tileSubview.removeFromSuperview()
            }
        }
    }
}

func addBackgroundTilesTimer()
{
    Timer.scheduledTimer(timeInterval: 6, target: self, selector: #selector(continueBackgroundTiles), userInfo: nil, repeats: true)
}

@objc func continueBackgroundTiles()
{
    // spawn a vertical and horizontal row every x seconds
    let itemHeight = self.frame.width / 7
    let widthBetween = (itemHeight * 2) / 5
    let columnHeight = widthBetween * 4

        
        for row in 0...7 {
            
            let columnPosition = (columnHeight * CGFloat(1))
            
            let xCalc = CGFloat(
                -((itemHeight + widthBetween) * 2) // two buffer rows to the left as well
                + (itemHeight * Double(row) + (widthBetween * Double(row))))
            
            let yCalc = (((self.frame.height - itemHeight) - columnPosition * 2) +
                         ((row % 2 == 1 ? columnHeight : 0)))
                    
            let tileSubview = CustomImageView(frame: CGRect(
                x: xCalc,
                y: yCalc,
                width: itemHeight,
                height: itemHeight))
            
            tileSubview.image = UIImage(named: "lightBand")!.withTintColor(.white)
            tileSubview.alpha = 0.04
            self.ContentView.addSubview(tileSubview)
             
            UIView.animate(withDuration: 30, delay: 0, options: [.curveLinear]) {
                
                let newX = ((itemHeight * Double(row)) + (widthBetween * Double(row))) + widthBetween * 3
                let newY = 0 - ((itemHeight + (row % 2 == 0 ? columnHeight : 0)) + columnPosition * 2)
                
                tileSubview.frame = CGRect(
                    x: newX,
                    y: newY,
                    width: itemHeight,
                    height: itemHeight
                )
            } completion: { completed in
                tileSubview.removeFromSuperview()
            }
        }
    }