presentationController

optional public func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController?

• 参数解释

  • presented：即将展示的视图控制器
  • presenting：展示presented视图控制器的视图控制器
  • source：调用方法present(_:animated:completion:)的视图控制器

• 注:

  • presenting和source不一定是同一个视图控制器