问题
I am trying to animate the appearance and disappearance of two view controllers' view.
I used the following two lines of code:
self.modalTransitionStyle=UIModalTransitionStyleCoverVertical;
[self presentModalViewController:viewcontroller animated:YES];
to make the view controller's view animate in from the bottom of the screen, which works well.
My question is: can I change the style of this animation so that the view isn't always sliding in from the bottom of the screen? How can I make it animate in from the top of the screen, for example?
回答1:
The modalTransitionStyle property on a view controller sets how that view controller will appear, not the animation that it will use to present a different controller. So you'd do something like:
viewcontroller.modalTransitionStyle=UIModalTransitionStyleCoverVertical;
[self presentModalViewController:viewcontroller animated:YES];
(and I'm in the habit of having view controllers dictate their own modal transition style in an overridden initWithCoder:, but that's a style question I guess).
The list of available transition styles is here. So, to try the animation where one controller flips over like a playing card, as if the other were printed on the opposite side:
viewcontroller.modalTransitionStyle=UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:viewcontroller animated:YES];
来源：https://stackoverflow.com/questions/5004102/is-there-a-way-to-change-the-animation-style-of-a-modal-view-controller-appearan