Rotating the screen from Portrait to Landscape - iphone

Question

I use following code I found in the web to rotate the screen to landscape mode. I don’t understand what they suppose to do. Specially the bounds it is setting. Can someone give some explanation what it is doing?
if ([[UIApplication sharedApplication] statusBarOrientation] == UIInterfaceOrientationPortrait)
{
CGRect statusBarFrame = [[UIApplication sharedApplication] statusBarFrame];
[[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeRight animated:NO];
UIScreen *screen = [UIScreen mainScreen];
CGRect newBounds = CGRectMake(0, 0, screen.bounds.size.height, screen.bounds.size.width - statusBarFrame.size.height);
self.navigationController.view.bounds = newBounds;
self.navigationController.view.center = CGPointMake(newBounds.size.height / 2.0, newBounds.size.width / 2.0);
self.navigationController.view.transform = CGAffineTransformConcat(self.navigationController.view.transform, CGAffineTransformMakeRotation(degreesToRadian(90)));
self.navigationController.view.center = window.center;
}

Answer 1

Your rootView's size used to be (320, 480) for example, after rotating, you should set it to (480, 320) in order to fit the screen in landscape mode, that's why you need to change the bounds of your view.
Set the transform is making the view actually rotate 90 degrees.
UIKit is doing the similar things when automatically rotate for you.

Answer 2

Hello Janaka,
You will try this code.
Take a look at the function `shouldAutorotateToInterfaceOrientation`: in the UIViewController class. This function returns YES if the orientations is supported by your UIView. If you return YES only to the landscape orientation, then 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.
Use this Method.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
// Return YES for supported orientations
return (interfaceOrientation == UIInterfaceOrientationLandscape);
}
Try this link its definitely help you
this

Answer 3

#define degreesToRadians(x) (M_PI * x / 180.0)
- (void)viewWillAppear:(BOOL)animated
{
[[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeRight];
CGRect newBounds = CGRectMake(0, 0, 480, 320);
self.navigationController.view.bounds = newBounds;
self.navigationController.view.center = CGPointMake(newBounds.size.height / 2.0, newBounds.size.width / 2.0);
self.navigationController.view.transform = CGAffineTransformMakeRotation(degreesToRadians(90));
[super viewWillAppear:animated];
}
- (void)viewWillDisappear:(BOOL)animated
{
self.navigationController.view.transform = CGAffineTransformIdentity;
self.navigationController.view.transform = CGAffineTransformMakeRotation(degreesToRadians(0));
self.navigationController.view.bounds = CGRectMake(0.0, 0.0, 320.0, 480.0);
[super viewWillDisappear:animated];
}