Smart key path using with CABasicAnimation

KeyPathAnimation.swift

class KeyPathAnimation<View, Value> {
    let basicAnimation: CABasicAnimation
    
    let keyPath: KeyPath<View, Value>
    
    init(keyPath: KeyPath<View, Value>) {
        self.keyPath = keyPath
        // https://github.com/apple/swift/blob/2844583d7f9d51ce5c4da7776e19f0aab6f2e3f6/stdlib/public/core/KeyPath.swift#L107
        basicAnimation = CABasicAnimation(keyPath: keyPath._kvcKeyPathString)
    }
    
    
    // MARK: - CABasicAnimation
    
    var fromValue: Value? {
        get {
            return basicAnimation.fromValue as? Value
        }
        set {
            basicAnimation.fromValue = newValue
        }
    }
    
    var toValue: Value? {
        get {
            return basicAnimation.toValue as? Value
        }
        set {
            basicAnimation.toValue = newValue
        }
    }
}