OwnedDelegateAlertView.swift

/**
 A UIAlertView that owns its delegate so that the client that displays the UIAlertView
 does not need to own it.

 This is useful when the client that displays the UIAlertView is not the UIAlertDelegate
 implementation. It is free to initialize an object to serve as the delegate that exists
 only for the lifetime of the UIAlertView, thereby fostering decomposition.
 */
class OwnedDelegateAlertView: UIAlertView {
	private let ownedDelegate: AnyObject?

	override init(title: String?, message: String?, delegate: AnyObject?, cancelButtonTitle: String?) {
		ownedDelegate = delegate
		super.init(title: title, message: message, delegate: delegate, cancelButtonTitle: cancelButtonTitle)
	}

	convenience init(title: String, message: String, delegate: UIAlertViewDelegate, cancelButtonTitle: String, otherButtonTitles firstButtonTitle: String, _ moreButtonTitles: String...) {
		self.init(title: title, message: message, delegate: delegate, cancelButtonTitle: cancelButtonTitle)

		addButtonWithTitle(firstButtonTitle)
		moreButtonTitles.each { self.addButtonWithTitle($0); return }
	}

	required init(coder aDecoder: NSCoder) {
	    fatalError("init(coder:) has not been implemented")
	}

	override init(frame: CGRect) { super.init(frame: frame) }
}