Animation.swift

swift

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        self.addBar()
    }
    
    func addBar() {
        let bar = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
        bar.backgroundColor = UIColor.red
        self.view.addSubview(bar)
        
        UIView.animate(withDuration: 10, animations: {
            bar.transform = CGAffineTransform(scaleX: 5.0, y: 1.0)
        }) { (complete) in
            UIView.animate(withDuration: 10, animations: {
                bar.transform = CGAffineTransform(scaleX: 1.0, y: 1.0)

            }, completion: { (complete) in
                
            })
        }
    }

}