Detecting rotation to landscape manually

Question

hi all,

I am working on an iPhone application based on UITabBarController and UIViewControllers for each page. The app needs to run in portrait mode only, so every view controller + app delegate goes with this line of code:

• (BOOL)shouldAutorotateToInterfaceOrientation: (UIInterfaceOrientation)interfaceOrientation { return (interfaceOrientation == UIInterfaceOrientationPortrait); }

There is one view controller where I would like to pop up a UIImageView when the iPhone is rotaed to landscapeleft. The design of the image looks landscape, although the width and height are 320x460 ( so its portrait ).

How can/should I detect this type of rotation manually, just in this specific view controller, withouth having an auto rotation on the entire view?

Thomas

UPDATE:

Thanks!

I added this listener in the viewDidLoad:

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(didRotate:)name:UIDeviceOrientationDidChangeNotification object:nil];

the didRotate looks like this:

• (void) didRotate:(NSNotification *)notification

  {
  UIDeviceOrientation orientation = [[UIDevice currentDevice] orientation];

  if (orientation == UIDeviceOrientationLandscapeLeft)
  {
      //your code here
  
  
  }
  

  }

Answer 1

I needed that in an old project - hope it still works...

1) Register a notification:

[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(detectOrientation) name:@"UIDeviceOrientationDidChangeNotification" object:nil];  

2) Then you can test against the rotation on change:

-(void) detectOrientation {
    if (([[UIDevice currentDevice] orientation] == UIDeviceOrientationLandscapeLeft) || 
        ([[UIDevice currentDevice] orientation] == UIDeviceOrientationLandscapeRight)) {
        [self doLandscapeThings];
    } else if ([[UIDevice currentDevice] orientation] == UIDeviceOrientationPortrait) {
        [self doPortraitThings];
    }   
}

Hope that helps!