//: Playground - noun: a place where people can play

import UIKit

let shape = UIView(frame: CGRect(x: 0, y: 0, width: 100, height: 100))
shape.backgroundColor = .lightGray
shape.layer.cornerRadius = shape.bounds.height/2

let label = UILabel(frame: .zero)
label.font = UIFont.boldSystemFont(ofSize: shape.bounds.height/2)

var count = 1
label.text = "\(count)"
label.sizeToFit()

let container = UIView(frame: CGRect(x: 0, y: 0, width: 500, height: 200))
container.addSubview(shape)
container.addSubview(label)
container.backgroundColor = .white

shape.center = container.center
label.center = shape.center

class Bla: NSObject {
    @objc func onTap(_ g: UIGestureRecognizer) {

        let duration: TimeInterval = 0.2
        let shrinkTo: CGFloat = 0.5

        UIView.animate(withDuration: duration, animations: {
            UIView.animate(withDuration: 0, delay: 0, options: [.curveEaseIn], animations: {
                shape.transform.a = shrinkTo
                label.transform.d = 1 - 0.2 * shrinkTo
            })
            UIView.animate(withDuration: 0, delay: 0, options: [.curveEaseOut], animations: {
                label.transform.a = 0.001
                label.transform.tx = -shape.bounds.width/2 * shrinkTo + 1
            }) { _ in
                count+=1
                label.text = "\(count)"
                label.sizeToFit()
                label.transform.tx = -label.transform.tx

                UIView.animate(withDuration: duration, animations: {
                    UIView.animate(withDuration: 0, delay: 0, options: [.curveEaseOut], animations: {
                        shape.transform.a = 1
                        label.transform.a = 1
                    })
                    UIView.animate(withDuration: 0, delay: 0, options: [.curveEaseIn], animations: {
                        label.transform.d = 1
                        label.transform.tx = 0
                    })
                })
            }
        })

    }
}

let a = Bla()
container.addGestureRecognizer(UITapGestureRecognizer(target: a, action: #selector(Bla.onTap(_:))))

import PlaygroundSupport
PlaygroundPage.current.liveView = container
PlaygroundPage.current.needsIndefiniteExecution = true