Animating Progress Bar

progressBarAnimation.swift

extension UIProgressView {
    
    func animate(duration: Double) {
        
        setProgress(0.01, animated: true)
        
        UIView.animate(withDuration: duration, delay: 0.0, options: .curveLinear, animations: {
            self.setProgress(1.0, animated: true)
        }, completion: nil)
    }
}


// Animate your actual progress bar like this (10 second countdown):
progressBar.animate(duration: 10)