How to achieve this in iOS? - iphone

Question

I am referring to DMD Panorama app.
As you can see there is a Yin-yang symbol at the top section of this image.
Once we rotate our device, the two symbols come closer, like below:
Can you please let me know how do I detect rotation of the device so that when device is rotated, these two images come closer?
I appreciate your response.

Answer 1

Add a notifier in the viewWillAppear function
-(void)viewWillAppear:(BOOL)animated{
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(orientationChanged:) name:UIDeviceOrientationDidChangeNotification object:nil];}
The orientation change notifies this function
- (void)orientationChanged:(NSNotification *)notification{
[self adjustViewsForOrientation:[[UIApplication sharedApplication] statusBarOrientation]];}
which in-turn calls this function where the moviePlayerController frame is orientation is handled
- (void) adjustViewsForOrientation:(UIInterfaceOrientation) orientation {
if (orientation == UIInterfaceOrientationPortrait || orientation == UIInterfaceOrientationPortraitUpsideDown)
{
//load the portrait view
}
else if (orientation == UIInterfaceOrientationLandscapeLeft || orientation == UIInterfaceOrientationLandscapeRight)
{
//load the landscape view
}}
in viewDidDisappear remove the notification
-(void)viewDidDisappear:(BOOL)animated{
[[NSNotificationCenter defaultCenter]removeObserver:self name:UIDeviceOrientationDidChangeNotification object:nil];}

Answer 2

first you register for notification
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(detectDeviceOrientation) name:UIDeviceOrientationDidChangeNotification object:nil];
then add this method
-(void) detectDeviceOrientation
{
if (([[UIDevice currentDevice] orientation] == UIDeviceOrientationLandscapeLeft) ||
([[UIDevice currentDevice] orientation] == UIDeviceOrientationLandscapeRight))
{
// Landscape mode
} else if ([[UIDevice currentDevice] orientation] == UIDeviceOrientationPortrait)
{
// portrait mode
}
}

Answer 3

Try doing the following when the application loads or when your view loads:
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter]
addObserver:self selector:#selector(orientationChanged:)
name:UIDeviceOrientationDidChangeNotification
object:[UIDevice currentDevice]];
Then add the following method:
- (void) orientationChanged:(NSNotification *)note
{
UIDevice * device = note.object;
switch(device.orientation)
{
case UIDeviceOrientationPortrait:
/* set frames for images */
break;
case UIDeviceOrientationPortraitUpsideDown:
/* set frames for images */
break;
default:
break;
};
}
The above will allow you to register for orientation changes of the device without enabling the autorotate of your view.