Allows classes to be configured and initialized with a closure

Configurable.swift

import UIKit

/// Adds a `configure` method with a closure that is executed with `Self` as a parameter
protocol Configurable { }

extension Configurable {
    /// Configures the instance with a closure that is executed with `Self` as a parameter
    /// - Parameter configurer: Closure exectured immediately with `Self` as a parameter
    /// - Parameter instance: Use this parameter to 'configure' the instance
    func configure(with configurer: (_ instance: Self) -> Void) {
        configurer(self)
    }
}

/// Allows the type to be initialized with a configuration closure, requiring it to at least have an `init()` method
protocol InitConfigurable: Configurable {
    init()
}

extension InitConfigurable {
    
    /// Initailizes the type with a closure that is executed with `Self` as a parameter
    /// - Parameter configurer: Closure called immidiately after initialization. Use it to configure the instance
    /// - Parameter instance: Use this parameter to 'configure' the instance
    ///
    /// Using this method allows classes to be instantiated like in the following example
    /// ```
    /// let view = UIView { view in
    ///     view.backgroundColor = .white
    ///     view.layer.cornerRadius = 16
    ///     view.layer.masksToBounds = true
    ///     view.layer.cornerCurve = .continuous
    /// }
    init(with configurer: (_ instance: Self) -> Void) {
        self.init()
        configure(with: configurer)
    }
}

/// Behavior added to all subclasses of NSObject, but might not work in all projects
/// Could also be added to `UIView` instead
extension NSObject: InitConfigurable { }

/// Special case for `UITableView` that can initialize with a style too
extension UITableView {
    public convenience init(style: UITableView.Style, configurer: (_ instance: Self) -> Void) {
        self.init(frame: .zero, style: style)
        configurer(self)
    }
}