Change views when iPhone is rotated? - objective-c

Question

How would I have one view up when the iPhone is in a standard 'portrait' orientation, and switch to a different view (say a graph or something) when rotated to a landscape orientation and visa versa?

Answer 1

Disable orientation for that view (assuming that the first view is landscape)
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation{
return (interfaceOrientation == UIInterfaceOrientationLandscapeLeft)||(interfaceOrientation == UIInterfaceOrientationLandscapeRight); }
Then add this to the viewDidAppear
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter]
addObserver:self selector:#selector(orientationChanged:)
name:UIDeviceOrientationDidChangeNotification
object:[UIDevice currentDevice]];
And add this method somewhere
- (void) orientationChanged:(NSNotification *)note
{
UIDevice * device = note.object;
switch(device.orientation)
{
case UIDeviceOrientationPortrait:
// Present View Controller here
break;
default:
break;
};
}
And on the other view do the same but backwards with a dismiss for landscape instead of the present for portrait.
Dont forget to unregister for the notifications.
(alternatively use a navigation view with both controls but without the bar and simply show the one you want depending on the orientation using)
- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation
duration:(NSTimeInterval)duration

Answer 2

First read how UIViewControllers work:
http://developer.apple.com/library/ios/#documentation/uikit/reference/UIViewController_Class/Reference/Reference.html
Then, in your UIViewController subclass, take advantage of willRotateToInterfaceOrientation:duration: to change out your views.
e.g.
- (void)willRotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
// if portrait
[self.landscapeView removeFromSuperview];
[self.view addSubview:self.portraitView];
// if landscape
[self.portraitView removeFromSuperview];
[self.view addSubview:self.landscapeView];
}
And add in the appropriate if statement or switch case to determine which to do.