前言：
之前練習所寫的模擬進度圈，採用圖片輪播

正文：
先製作圖片
再導入圖片到 Assets.xcassets 後
可以用陣列來輪播
接著計數時間跳轉頁面

import UIKit

class ViewController: UIViewController {
    
    @IBOutlet weak var ConnectProgressRateImage: UIImageView!
    @IBOutlet weak var countLabel: UILabel!
    
    let imgArr = [
      UIImage(named:"circle1")!,
      UIImage(named:"circle2")!,
      UIImage(named:"circle3")!,
      UIImage(named:"circle4")!,
      UIImage(named:"circle5")!,
      UIImage(named:"circle6")!,
      UIImage(named:"circle7")!,
      UIImage(named:"circle8")!,
      UIImage(named:"circle9")!,
      UIImage(named:"circle10")!,
      UIImage(named:"circle11")!,
      UIImage(named:"circle12")!,
      UIImage(named:"circle13")!,
      UIImage(named:"circle14")!,
      UIImage(named:"circle15")!,
      UIImage(named:"circle16")!,]
    //計數跳轉頁面
    var countValue = 0
    var countInt = 1
    override func viewDidLoad() {
        super.viewDidLoad()
        
        imageChange()
        
    }
    override func viewDidAppear(_ animated: Bool) {
        countLoop()
        DispatchQueue.main.async { [self] in
            countLabel.reloadInputViews()
        }
    }
    
    
    func countLoop(){
        for _ in 0...100{
            usleep(100000)
            if countValue != 100 {
                countValue += 1
                countLabel.text = "\(countValue)%"
                print("\(String(describing: countLabel))")
            }
            countLabel.setNeedsDisplay()
        }
        performSegue(withIdentifier: "GOSecondVC", sender: nil)
    }
    func imageChange() {
        // 設置要輪播的圖片陣列
        ConnectProgressRateImage.animationImages = imgArr
        // 輪播一次的總秒數
        ConnectProgressRateImage.animationDuration = 1
        // 要輪播幾次 (設置 0 則為無限次)
        ConnectProgressRateImage.animationRepeatCount = 9
        // 開始輪播
        ConnectProgressRateImage.startAnimating()
    }
}

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