How do you present a UIViewController from the top of the screen instead of the bottom?

Question

I am using a UIViewController and I use presentModalViewController:controllerr animated:YES to present it but I would like if it would slide down from the top of the screen instead of up from the bottom, any way to do this?

Answer 1

I created a function for pushing the ViewControllers from all 4 directions:

- (void) slideLayerInDirection:(NSString *)direction andPush:(UIViewController *)dstVC {
  CATransition* transition = [CATransition animation];
  transition.duration = 0.5;
  transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
  transition.type = kCATransitionPush;
  transition.subtype = direction;
  [self.view.layer addAnimation:transition forKey:kCATransition];
  [self pushViewController:dstVC animated:NO];
}

The header file contains the following:

#import <QuartzCore/QuartzCore.h>

#define direction_left kCATransitionFromLeft
#define direction_top kCATransitionFromBottom
#define direction_right kCATransitionFromRight
#define direction_bottom kCATransitionFromTop