Markdown

makrdown.swift

/**
Initializes a new Show Case View.

- Parameter target: 				The bar button that's targeted and whose feature is intended to be exaplained
- Parameter label:					*Optional*, an identifier for the show case

- Remark:							From iOS 11 onwards, the target must be a custom bar button item, that is, it must have been created by using *init(customView: UIView?)* constructor. If not so, it'll return *nil*
- Note:								The show case arrow direction will always point upwards

*/
public init?(target: UIBarButtonItem, label: String? = nil) {
	let targetViewUnwrapped = target.customView ?? (target.value(forKey: "view") as? UIView) 
	guard let targetView = targetViewUnwrapped else { return nil }

	self.target = targetView
	self.arrowDirection = .up
	self.label = label
	super.init(frame: CGRect.zero)

	isBarButton = true
	shouldWhitenScreenshot = true
	setUp()
}