1,PortraitViewController 不旋转，保持竖屏

//iOS 5- (BOOL) shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation{	return (toInterfaceOrientation == UIInterfaceOrientationPortrait);}//iOS 6- (BOOL)shouldAutorotate{	return NO;}- (NSUInteger)supportedInterfaceOrientations{	return UIInterfaceOrientationMaskPortrait;}- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation{	return UIInterfaceOrientationPortrait;}

2.

LandscapeViewController 始终保持横屏

//iOS 5- (BOOL) shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation{	return (toInterfaceOrientation == self.preferredInterfaceOrientationForPresentation);}//iOS 6- (BOOL) shouldAutorotate{	return YES;}- (NSUInteger)supportedInterfaceOrientations{	return UIInterfaceOrientationMaskLandscapeRight;}- (UIInterfaceOrientation)preferredInterfaceOrientationForPresentation{	return UIInterfaceOrientationLandscapeRight;}