https://mp.weixin.qq.com/s/cltsFffNGIRe0u4-iJ5yVQ

PresentViewController

let mainViewController = UIView()  // 即需要被present的view
mainViewController.modalPresentationStyle = .fullScreen
self.present(mainViewController, animated: true, completion: nil)

- (UIModalPresentationStyle)modalPresentationStyle {
    return UIModalPresentationFullScreen;
}