NSSortDescriptor+KeyPath.swift

extension NSSortDescriptor {
    /// Usage:
    /// NSSortDescriptor(
    ///     keyPath: \YourType.propertyName,
    ///     ascending: false
    /// )
    convenience init<T, U: Any>(keyPath: KeyPath<T, U>, ascending: Bool) {
        self.init(
            key: NSExpression(forKeyPath: keyPath).keyPath,
            ascending: ascending
        )
    }
}