<commit_before>import Foundation
import enum Result.NoError

/// Wraps a `dynamic` property, or one defined in Objective-C, using Key-Value
/// Coding and Key-Value Observing.
///
/// Use this class only as a last resort! `MutableProperty` is generally better
/// unless KVC/KVO is required by the API you're using (for example,
/// `NSOperation`).
@objc public final class DynamicProperty: RACDynamicPropertySuperclass, MutablePropertyType {
	public typealias Value = AnyObject?

	private weak var object: NSObject?
	private let keyPath: String

	private var property: MutableProperty<AnyObject?>?

	/// The current value of the property, as read and written using Key-Value
	/// Coding.
	public var value: AnyObject? {
		@objc(rac_value) get {
			return object?.valueForKeyPath(keyPath)
		}

		@objc(setRac_value:) set(newValue) {
			object?.setValue(newValue, forKeyPath: keyPath)
		}
	}

	/// A producer that will create a Key-Value Observer for the given object,
	/// send its initial value then all changes over time, and then complete
	/// when the observed object has deallocated.
	///
	/// By definition, this only works if the object given to init() is
	/// KVO-compliant. Most UI controls are not!
	public var producer: SignalProducer<AnyObject?, NoError> {
		return property?.producer ?? .empty
	}

	public var signal: Signal<AnyObject?, NoError> {
		return property?.signal ?? .empty
	}

	/// Initializes a property that will observe and set the given key path of
	/// the given object. `object` must support weak references!
	public init(object: NSObject?, keyPath: String) {
		self.object = object
		self.keyPath = keyPath
		self.property = MutableProperty(nil)

		/// DynamicProperty stay alive as long as object is alive.
		/// This is made possible by strong reference cycles.
		super.init()

		object?.rac_valuesForKeyPath(keyPath, observer: nil)?<commit_msg>Add some markup to `DynamicProperty.swift`<commit_after>import Foundation
import enum Result.NoError

/// Wraps a `dynamic` property, or one defined in Objective-C, using Key-Value
/// Coding and Key-Value Observing.
///
/// Use this class only as a last resort! `MutableProperty` is generally better
/// unless KVC/KVO is required by the API you're using (for example,
/// `NSOperation`).
@objc public final class DynamicProperty: RACDynamicPropertySuperclass, MutablePropertyType {
	public typealias Value = AnyObject?

	private weak var object: NSObject?
	private let keyPath: String

	private var property: MutableProperty<AnyObject?>?

	/// The current value of the property, as read and written using Key-Value
	/// Coding.
	public var value: AnyObject? {
		@objc(rac_value) get {
			return object?.valueForKeyPath(keyPath)
		}

		@objc(setRac_value:) set(newValue) {
			object?.setValue(newValue, forKeyPath: keyPath)
		}
	}

	/// A producer that will create a Key-Value Observer for the given object,
	/// send its initial value then all changes over time, and then complete
	/// when the observed object has deallocated.
	///
	/// - note: this only works if the object given to init() is KVO-compliant. 
	///         Most UI controls are not!
	public var producer: SignalProducer<AnyObject?, NoError> {
		return property?.producer ?? .empty
	}

	public var signal: Signal<AnyObject?, NoError> {
		return property?.signal ?? .empty
	}

	/// Initializes a property that will observe and set the given key path of
	/// the given object. `object` must support weak references!
	///
	/// - parameters:
	///   - object: An object to be observed.
	///   - keyPath: Object's key path to be observed.
	public init(object: NSObject?, keyPath: String) {
		self.object = object
		self.keyPath = keyPath
		self.property = MutableProperty(nil)

		/// DynamicProperty stay alive as long as object is alive.
		/// This is made possible by strong reference cycles.
		super.init()

		object?.rac_valuesForKeyPath(keyPath, observer: nil)?
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