iPhone SDK: Orientation (Landscape and Portrait views) - cocoa-touch

Question

Okay, I've got my normal app which is in portrait mode. I can force my app to go to landscape mode for a view (using navigationcontroller and viewcontroller) like this:
- (void)viewWillAppear:(BOOL)animated {
[[UIDevice currentDevice] setOrientation:UIInterfaceOrientationLandscapeRight];
}
But then when I go back to the main menu (tableview) it goes straight back to portrait. I try this code:
- (void)viewWillAppear:(BOOL)animated {
[[UIDevice currentDevice] setOrientation:UIInterfaceOrientationPortrait];
}
But that doesn't work..
Any ideas?

Answer 1

Take a look at the function shouldAutorotateToInterfaceOrientation: in the UIViewController class. This function returns YES if the orientations are supported by your UIView. If you return YES only to the landscape orientation, the iPhone will automatically be put in that orientation.
The following code should do it. Put it in the UIViewController that controls the view that you want to put in landscape mode.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationLandscape);
}

Answer 2

To get this to work, I added this to the rootviewcontroller:
- (void)viewWillAppear:(BOOL)animated {
[[UIDevice currentDevice] setOrientation:UIInterfaceOrientationPortrait];
}
This seems to be working now.

Answer 3

Here's what I'm doing to do this:
first, put this define at the top of your file, right under your #imports:
#define degreesToRadian(x) (M_PI * (x) / 180.0)
then, in the viewWillAppear: method
[[UIApplication sharedApplication] setStatusBarHidden:YES animated:NO];
if (self.interfaceOrientation == UIInterfaceOrientationPortrait) {
self.view.transform = CGAffineTransformIdentity;
self.view.transform = CGAffineTransformMakeRotation(degreesToRadian(90));
self.view.bounds = CGRectMake(0.0, 0.0, 480, 320);
}
if you want that to be animated, then you can wrap the whole thing in an animation block, like so:
[UIView beginAnimations:#"View Flip" context:nil];
[UIView setAnimationDuration:1.25];
[UIView setAnimationCurve:UIViewAnimationCurveEaseInOut];
[[UIApplication sharedApplication] setStatusBarHidden:YES animated:NO];
if (self.interfaceOrientation == UIInterfaceOrientationPortrait) {
self.view.transform = CGAffineTransformIdentity;
self.view.transform = CGAffineTransformMakeRotation(degreesToRadian(90));
self.view.bounds = CGRectMake(0.0, 0.0, 480, 320);
}
[UIView commitAnimations];
Then, in your portrait mode controller, you can do the reverse - check to see if its currently in landscape, and if so, rotate it back to Portrait.

Answer 4

You need to edit your Info.plist file to add the UIInterfaceOrientation key with the appropriate value (UIInterfaceOrientationLandscapeRight or UIInterfaceOrientationLandscapeLeft).

Answer 5

You can't use this private API.
There is a solution to do that : it's to use a view controller and adding its view to the window. then in that controller you force landscape in the shouldAutorotate... methode. It works fine, but be sure it's necessary for your project to use that, because it's not very smart  to force the user to turn his iPhone. By the way, here is an example code if you need it.
http://www.geckogeek.fr/iphone-forcer-le-mode-landscape-ou-portrait-en-cours-dexecution.html