Question

I have AllowEditing set to true, and after the image is captured, I want to give additional instructions in the editing screen to crop out part of the image. Is that possible?

Answer 1

The UIImagePickerViewController is in fact a UINavigationController. This gives you the ability to track on which step in the UINavigationViewController you are, so you can set the overlay view only when the second view controller is reached.

In brief:
– UIImagePickerController.delegate = self
– make self conform to the UINavigationControllerDelegate protocol
– implement next method:

- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    if ([navigationController.viewControllers indexOfObject:viewController] == 1)
    {
        // If second UIViewController, set your overlay.
    }
}