如何使用Core Animation在我自己的类中随时间插值属性值？

import UIKit
import QuartzCore

class CustomView: UIView {
    var customProperty: CGFloat = 0.0

    func animateCustomProperty(to newValue: CGFloat, duration: CFTimeInterval) {
        let animation = CABasicAnimation(keyPath: "customProperty")
        animation.fromValue = customProperty
        animation.toValue = newValue
        animation.duration = duration
        animation.timingFunction = CAMediaTimingFunction(name: .easeInEaseOut)
        layer.add(animation, forKey: "customPropertyAnimation")
        customProperty = newValue
    }
}