buttonAnimationBig

gistfile1.txt

import UIKit

class ViewController: UIViewController {

    let caButton = UIButton()

    override func viewDidLoad() {
        super.viewDidLoad()
        caButton.backgroundColor = .yellow
        caButton.frame = CGRect(x: 320, y: 20, width: 0, height: 0)
        view.addSubview(caButton)
        self.caButton.alpha = 0
        self.navigationController?.navigationBar.addSubview(caButton)
        buttonAnimationBig()
    }

    func buttonAnimationBig() {
            UIView.animate(withDuration: TimeInterval(0.4),
                           animations: {}, completion: { _ in
                UIView.animate(withDuration: 0.2,
                               animations: {
                                self.caButton.alpha = 1
                                self.caButton.frame.origin.x -= 50
                                self.caButton.frame.origin.y -= 20
                                self.caButton.frame.size.width += 100
                                self.caButton.frame.size.height += 40
                })
            })
    }
}