Different presentation modes of Modal View Controller

ModalPresentationStyle:

UIModalPresentationFullScreen: Full Screen mode, that is, the pop-up window occupies the entire screen, which is the same in portrait mode and landscape mode,

UIModalPresentationFormSheet: the window is reduced so that it is in the middle of the screen. Both portrait and landscape are the same, but note that if the keyboard appears under landscape, the window position will be adjusted.

UIModalPresentationPageSheet: This is a powerful mode. It is FullScreen in portrait, and the FormSheet mode in landscape is a bit like (there is no space left up or down ), note that you can directly use this mode for those who have this requirement. Do not program your own to switch between FullScreen and FormSheet. This is very troublesome.

UIModalPresentationCurrentContext :( if you have time, add it again)

Example:

ControllerA. modalPresentationStyle = UIModalPresentationPageSheet;

[Self presentModalViewController: ControllerA animated: YES];