使对象/图像在Xcode中随机出现和消失

import UIKit

class ViewController: UIViewController {
    @IBOutlet weak var objectImageView: UIImageView!
    
    var timer: Timer?
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 开始定时器
        startTimer()
    }
    
    func startTimer() {
        timer = Timer.scheduledTimer(timeInterval: 3, target: self, selector: #selector(updateObject), userInfo: nil, repeats: true)
    }
    
    @objc func updateObject() {
        // 生成随机位置
        let randomX = CGFloat(arc4random_uniform(UInt32(view.frame.width - objectImageView.frame.width)))
        let randomY = CGFloat(arc4random_uniform(UInt32(view.frame.height - objectImageView.frame.height)))
        
        // 设置对象/图像的位置
        objectImageView.frame.origin = CGPoint(x: randomX, y: randomY)
        
        // 动画使对象/图像消失
        UIView.animate(withDuration: 1, animations: {
            self.objectImageView.alpha = 0
        }) { (_) in
            // 延迟一段时间后重新生成随机位置，使对象/图像重新出现
            DispatchQueue.main.asyncAfter(deadline: .now() + 1) {
                self.objectImageView.alpha = 1
            }
        }
    }
}