How to slide UIViewcontroller on a button even from bottom to top like an action sheet?

I am making an iPhone application. I want to slide a view controller on a button event from bottom to top just like action sheet. Can anyone please suggest me some code or sample fo开发者_Python百科r this? Please help.

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Use the following code to slide a UIView from bottom to top:

 myViewController *obj = [[myViewController alloc] init];
 [self presentModalViewController:obj animated:YES];

and the code below to slide a UIView from top to bottom, i.e., to dismiss the UIView:

[self dismissModalViewControllerAnimated:YES];

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UIModalTransitionStyleCoverVertical slides a view up from the bottom of the screen. On dismissal, the view slides back down.