【Swift】プログレスバーのアニメーションやスタイルを設定してタスクの進捗度を可視化する方法を解説！

import UIKit

class ViewController: UIViewController {

    var progressView: UIProgressView!
    var progress: Float = 0.0

    override func viewDidLoad() {
        super.viewDidLoad()
        setupProgressView()
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        self.progressView.setProgress(0.0, animated: true)
    }

    @IBAction func goToNextScreen(_ sender: Any) {
        let nextVC = self.storyboard?.instantiateViewController(withIdentifier: "NextVC") as! NextViewController
        progress = 1.00
        progressView.setProgress(progress, animated: true)
        nextVC.progress = self.progress
        self.navigationController?.pushViewController(nextVC, animated: true)
    }

    func setupProgressView() {
        progressView = UIProgressView(progressViewStyle: .default)
        progressView.frame = CGRect(x: 20, y: 100, width: self.view.frame.size.width - 40, height: 50)
        view.addSubview(progressView)
    }
}

import UIKit

class NextViewController: UIViewController {

    var progressView: UIProgressView!
    var progress: Float = 0.0

    override func viewDidLoad() {
        super.viewDidLoad()
        setupProgressView()
        updateProgress()
    }

    @IBAction func goBack(_ sender: Any) {
        self.navigationController?.popToRootViewController(animated: true)
        
    }

    func setupProgressView() {
        progressView = UIProgressView(progressViewStyle: .default)
        progressView.frame = CGRect(x: 20, y: 100, width: self.view.frame.size.width - 40, height: 50)
        view.addSubview(progressView)
    }

    func updateProgress() {
        progressView.setProgress(progress, animated: true)
    }
}