Question

I have a table view with some words, and i present flash-card style landscape view when the device rotates. I made it by observing the “UIDeviceOrientationDidChangeNotification”.

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

1)That works fine and smooth, but the problem is that when the we are in the landscape, i don’t want the viewcontroller to react to the spinning around the vertical axis,so that i could lay the phone on the table and it would still be in the landscape.
Maybe i should somehow observe the horizontall spinnings, instead of deviceorientation?

-(void)openLandscapeMode
{

    if([[UIDevice currentDevice]orientation]==UIDeviceOrientationLandscapeLeft||[[UIDevice currentDevice]orientation]==UIDeviceOrientationLandscapeRight)
    {
        LandscapeCardViewController *landscape = [[LandscapeCardViewController alloc]init];
        landscape.words = words;
        landscape.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
        [self presentModalViewController:landscape animated:YES];
        NSLog(@"Switch to %@",[[NSUserDefaults standardUserDefaults]valueForKey:@"ChosenWordInCard"]);
        [landscape release];
    }
    else
    {
        [self dismissModalViewControllerAnimated:YES];  
        [[UIApplication sharedApplication]setStatusBarOrientation:UIInterfaceOrientationPortrait];

    }
}

2)The second question is where to remove observer, if this controller is in a tab bar, and i want to perform the same transition in another controller in the same tabbar,but,of course,with another landscape view?
I tried in viewWillDissappear, but it doesn’t work properly.
Thanks a lot!

Answer 1

I found the solution
I changed else to if([[UIDevice currentDevice]orientation]==UIDeviceOrientationPortrait||[[UIDevice currentDevice]orientation]==UIDeviceOrientationPortraitUpsideDown) and everything works fine!
Strange, but it works!

About removing the observer – i do it in -viewWillAppear,checking,if i am not in landscape now.