Sparrow Forum

1. 

   ahnt
   Moderator

   Hi,

   I was going through the various interface orientation explanations, and I guess this is the condensed way of doing it:

   In the ApplicationDelegate do this:

   - (BOOL)shouldAutorotateToInterfaceOrientation: UIInterfaceOrientation)interfaceOrientation{
   	return YES;
   }

   In the SPStage class, in it's initWithWidth: Height: method add this:

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

   and add another method in this class:

   -(void) orientationDetected:(UIEvent *)event{
       NSLog(@"%i",[UIDevice currentDevice].orientation);
   }

   Whenever the device is now turned, the orientationDetection method gets called, and you can update the screen accordingly within this method.

   I know there are several posts about this already, but I think the above one is the most straight forward way of doing it, and it is as straight forward as possible.

   Cheers Arend

   Posted 1 year ago #
2. 

   freerunnering
   Moderator

   Thanks, that's a very nice and simple way of explaining it.

   Posted 1 year ago #
3. 

   ahnt
   Moderator

   thank you, other people already explained the same thing, but IMO a little too convoluted. After I figured it out, I realized that there is a simpler way to put it.
   Enjoy, Cheers Arend

   Posted 1 year ago #
4. 

   saumya
   Member

   how cool!
   thank you ahnt. It works on simulator too.

   Posted 1 year ago #
5. 

   DonPaco
   Member

   Hello, thanks for the trick !

   I've tested it and I receive indeed the interface orientation in my logs.

   But how can i do a simple 180 degrees rotation of the game ? I've already set the 2 supported orientation in my app_info.plist but I don't have rotation of the app.

   Thanks in advance,
   DonPaco

   Posted 1 year ago #
6. 

   alex_h
   Moderator

   Hi all, wouldn't the above solution cause the SPView instance to rotate? As I understand it, ideally you should avoid rotating the SPView as this makes life more difficult for the OpenGL rendering and so compromises performance. If I'm wrong about this then let me know, as otherwise it would be great to be able to use such a simple approach to orientation!

   cheers,

   Alex H

   Posted 1 year ago #
7. 

   ahnt
   Moderator

   The trick is that an interface orientation change triggers the orientationDetect method to get called, the display is not actually rotating. So your SPView stays oriented the same way.

   I use a canvas (SPSprite) to draw on, and rotate that depending on the info I get from [UIDevice currentDevice].orientation, which only works after you initiated it.

   With other word:
   This is not executing an autoraotation of your view, but allows you to get information about the orientation and you rotate yourself.

   Cheers Arend

   Posted 1 year ago #
8. 

   alex_h
   Moderator

   Ah ok, I get it now - thanks!

   Posted 1 year ago #
9. 

   IlyaK
   Moderator

   This is phenomenal -- works perfectly. Thank you so much.

   Ilya

   Posted 10 months ago #
10. 

    Hen
    Member

    This works fine up until the other day I was testing my app on a low battery and got the 20% battery warning while my screen was "upside down" (rotated 180 degrees) and the AlertView showed as if my device wasn't rotated (it was upside down from my point of view). Any idea on how to let the device know you rotated the screen?

    Posted 9 months ago #
11. 

    alex_h
    Moderator

    you can use the command 'setStatusBarOrientation':

    eg:
    [[UIApplication sharedApplication] setStatusBarOrientation:UIInterfaceOrientationLandscapeRight animated:FALSE];

    Posted 9 months ago #
12. 

    menehune17
    Member

    One question, when you say SPStage Class, do you mean the one in the Sparrow core files? Or do you mean our own? The latter makes more sense, as it is safer than modifying core files.

    Thanks!

    PS. by "Sparrow core files" I am referring to the SPStage.h/m files within the Sparrow project inside any Scaffold-built project.

    Posted 9 months ago #
13. 

    Shilo
    Master Sparrow

    He means the subclass of SPStage (In Scafford it's Game.h/m). What I don't understand is the use of "- (BOOL)shouldAutorotateToInterfaceOrientation: UIInterfaceOrientation)interfaceOrientation" when that is only an overridden method for a UIViewController subclass, and it allows it's UIView to rotate, which you we wouldn't want for and OpenGL rendered UIView anyhow.

    His other explanation with the UIDeviceOrientationDidChangeNotification event handler is spot on. If you want a simple extention to rotate your Sparrow content, I suggest https://github.com/brianensorapps/BEScreen.

    Posted 9 months ago #
14. 

    SebastianMecklenburg
    Member

    Hello,

    this is an old thread but probably still visited now and then because it is linked from the tutorial section. I was just bitten by a bug on the iPad (at least in the simulator): It calls the orientationDetected callback twice, the second time inccorectly with a value of UIDeviceOrientationUnknown. When you then set the statusBarOrientation (as in the tutorial or the BEScreen class) it is wrong. This matters when you then implement your own text input bacause the keyboard will show up at the wrong position or not at all. To fix it you must do something like this:

    - (void)orientationDetected:(UIEvent *)event  {
     
       UIDeviceOrientation deviceOrientation = [UIDevice currentDevice].orientation;
     
       if(deviceOrientation == UIDeviceOrientationUnknown ||
          deviceOrientation == UIDeviceOrientationFaceUp ||
          deviceOrientation == UIDeviceOrientationFaceDown) {
          deviceOrientation = UIDeviceOrientationPortrait;
       }
     
       UIInterfaceOrientation interfaceOrientation = (UIInterfaceOrientation)deviceOrientation;
       [[UIApplication sharedApplication] setStatusBarOrientation:interfaceOrientation];
    }

    Regards,
    Sebastian Mecklenburg

    Posted 3 months ago #
15. 

    Daniel
    Primary Feather

    Another great find -- thanks for sharing! =)

    Posted 3 months ago #

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