optional public func presentationController(forPresented presented: UIViewController, presenting: UIViewController?, source: UIViewController) -> UIPresentationController?
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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
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注:
- presenting和source不一定是同一个视图控制器