I am trying to take a picture with my app and then show it in a UIImageView that is predefined in my .xib. I have a IBOutlet UIImageView *_foto that is linked to the UIImageView
Artur Ozierański's answer is partially correct.
If you're using viewDidLayoutSubviews() to configure your layout, this gets called when the picker disappears, so if you're setting the default image in viewDidLayoutSubviews(), you'll reset back to the default image.
Configure the default image in viewDidLoad.