平滑旋转并用阴影改变UIView的大小

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let container = UIView(frame: CGRect(x: 0, y: 0, width: 200, height: 200))
        container.backgroundColor = .blue

        let animation = CABasicAnimation(keyPath: "transform.rotation")
        animation.fromValue = 0.0
        animation.toValue = CGFloat.pi/4
        animation.duration = 1.0
        animation.repeatCount = 1
        animation.autoreverses = true
        animation.timingFunction = CAMediaTimingFunction(name: .easeInOutQuart)

        container.layer.add(animation, forKey: "rotationAnimation")

        let gradientLayer = CAGradientLayer(frame: container.bounds)
        gradientLayer.frame = container.bounds
        gradientLayer.colors = [UIColor.red.cgColor, UIColor.green.cgColor]
        gradientLayer.startPoint = CGPoint(x: 0, y: 0)
        gradientLayer.endPoint = CGPoint(x: 1, y: 1)
        container.layer.addSublayer(gradientLayer)

        UIView.animate(withDuration: 2, delay: 0, options: .curveEaseInOut, animations: {
            self.container.frame = CGRect(x: 0, y: 0, width: 200, height: 200)
            self.container.layer.cornerRadius = 10
        }, completion: nil)
    }
}

let gradientLayer = CAGradientLayer(frame: container.bounds)
gradientLayer.frame = container.bounds
gradientLayer.colors = [UIColor.red.cgColor, UIColor.green.cgColor]
gradientLayer.startPoint = CGPoint(x: 0, y: 0)
gradientLayer.endPoint = CGPoint(x: 1, y: 1)
container.layer.addSublayer(gradientLayer)

UIView.animate(withDuration: 2, delay: 0, options: .curveEaseInOut, animations: {
    self.container.frame = CGRect(x: 0, y: 0, width: 200, height: 200)
    self.container.layer.cornerRadius = 10
}, completion: nil)