super: UIButton on iOS
A UIButton object is a view that executes your custom code in response to user interactions. You communicate the purpose of a button using a text label, an image, or both.
Load() This event is called when the object becames available in the current runtime system.
Action() This event is called when a touch is released (touch-up) inside the bounds of the button
Unload() This event is called when the object has been removed from the current runtime system (but not yet deallocated).
var title: String The title of the button. Use this property instead of the titleForState and setTitleForState methods if you want to use the same title for all the button states.
var font: Font The font used for the button’s title string.
var type: ButtonType Returns the button type. (read-only)
var currentTitle: String Returns the title for the current button state. (read-only)
var currentTitleColor: Color Returns the color of the title for the current button state. (read-only)
var currentTitleShadowColor: Color Returns the color of the title shadow for the current button state. (read-only)
var currentImage: Image Returns the image for the current button state. (read-only)
var currentBackgroundImage: Image Returns the background image for the current button state. (read-only)
func Button(buttonType: ButtonType) Creates and returns a new button of the specified type.
func setTitleForState(title: String, state: ControlState) Sets the title associated with the specified state. At a minimum, you should set the value for the normal state. If a title is not specified for a state, the default behavior is to use the title associated with the normal state. If the value for normal is not set, then the property defaults to a system value.
func animate(duration: Float, delay: Float, options: Int, closure: Closure, completion: Closure) Animate changes to one or more views using the specified duration, delay, options and completion handler.