UIImagePickerController is not in the window heirarchy

[Dan Brooking]

Like all my problems that I end up solving, I'm guessing that this is something really simple that I'm missing.  I feel it's an iOS concept I might not be grasping.... anyways...

I am trying to add a UIImagePickerController to a UITabBarController. Basically, when the user selects one of the tab bar items, the camera will be displayed.

All the code I've seen for RubyMotion and UIImagePickerController involves NavigationControllers. Code is basically:

app_delegate.rb:

@window.rootViewController = UINavigationController.alloc.initWithRootViewController(RootController.alloc.init)

root_controller.rb

....stuff....

controller = UIImagePickerController.alloc.init

....more stuff...

self.navigationController.presentModalViewController(controller, animated:true)

So I try the same basic thing with my class for the view controller associated with that tab bar item.  Obviously, I'd need to change navigationController, so I try tabBarController.  I then get a message about presentModalViewController not being a method for tab bar controllers.  I have googled and saw someone suggest using parentViewController - this cause my app to no longer crash but it doesn't work and I get the message about

Warning: Attempt to present <UIImagePickerController: 0x20818ba0> on <UITabBarController: 0x20918ea0> whose view is not in the window hierarchy!

Any help? Thanks

Dan

[Colin Thomas Arnold Gray]

You want the image picker to appear in a tab? Then `presentModal` is the wrong tree to bark up. :-)

The navigation controller is all about adding and removing controllers, but with a tab-bar controller, you usually set the controllers once.

    ctlr = UITabBarController.new

    ctlr.viewControllers = [UIImagePickerController.new] # and others...

Also, you should test your image picker by assigning it as the rootViewController, just as a sanity check. 

#colinta

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[Dan Brooking]

Ohhhh.. I gotcha. 

So right now, when I set up my tabs, I'm setting them all to classes that are subclassed from UIViewController.  I just want to take that one for the camera and subclass UIImagePickerController?

[Colin T.A. Gray]

That's right!

It's also common to put a UINavigationController *within* a UITabBarController, so if that's useful to you, don't shy away from that.  The opposite, though (putting a UITabBarController inside a UINavigationController) is not allowed.

@colinta

colinta.com

github.com/colinta

[Dan Brooking]

OK, I made that switch and it is working now.  It just isn't working the way I expected.  

To give a little more detail, I'm looking at an iOS project coded in ObjC in XCode and trying to port it over to RubyMotion just as an exercise.

In Xcode, I have:

@interface MainTabBarController : UITabBarController<UIActionSheetDelegate>

and this has 5 views coming off of it.  One of them is:

@interface CameraViewController : UIViewController <UIImagePickerControllerDelegate>

which has this:

-(void)takePhoto {

    UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];

#if TARGET_IPHONE_SIMULATOR

    imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;

#else

    imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;

#endif

    imagePickerController.editing = YES;

    imagePickerController.delegate = (id)self;

    

    [self presentModalViewController:imagePickerController animated:YES];

}

In the obj-c version, when someone taps the camera tab, the camera comes up full screen.  When I just add UIImagePickerController as one of the tabs, the tab bar at the bottom stays and the camera takes up the rest of the screen.

Does that make sense?

[Colin T.A. Gray]

Aw, shoot, I forgot how annoying it is to hide the tab bar.

Hmm... geez, I dunno.  It seems wrong, to me, to use `presentModal`, but maybe that's the best way to do this! :-/

If you google around for "hide UITabBarController tabBar" you'll get some hits, but it looks like a tricky problem...

@colinta

colinta.com

github.com/colinta

[Dan Brooking]

OK thanks I'll give that a try!