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/// The HasCustomView protocol defines a customView property for UIViewControllers to be used in exchange of the regular view property.
/// In order for this to work, you have to provide a custom view to your UIViewController at the loadView() method.
public protocol HasCustomView {
associatedtype CustomView: UIView
extension HasCustomView where Self: UIViewController {
/// The UIViewController's custom view.
public var customView: CustomView {
guard let customView = view as? CustomView else {
fatalError("Expected view to be of type \(CustomView.self) but got \(type(of: view)) instead")
return customView
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