Clear an optional variable in Swift
var myImage: UIImage?Is basically short hand for making a UIImage point to nil automatically.
So to reset it back to the original value say:
myImage = nil
Optional is an enum type in Swift; it has two cases:
enum Optional<T> : NilLiteralConvertible { case None case Some(T) ...}By assigning an image to your Optional<UIImage>, you have implicitly specified .Some(image). To clear it, you can use .None. But since Optional also conforms to NilLiteralConvertible, you can use the simpler and clearer nil.