Finding screen size of camera view

I am using UIImagePickerController in my application. I am trying to get the camera view's size.

I used:

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

then I tried to get the CGRect f开发者_运维技巧rom

    CGRect rect = picker.view.frame;

but the rect I got included the Controll Bar. I want to get the size of the view without the control bar. Anyone got a clue? I tried to search related topics, but so far didnt get anywhere. Thanks a lot.