iOS 2 different nav bar images - ios

Question

I have replaced the nave bar in my iOS7 app in Xcode 5 using the following code (also removed the status bar if that matters):
AppDelegate.M
[[UINavigationBar appearance] setBackgroundImage:[UIImage imageNamed:#"navBar"] forBarMetrics:UIBarMetricsDefault];
In one of my image view controllers I am using a UIImagePicker to pick a profile pic. The problem is when it goes to the photo gallery it uses the main "navBar" image which hides some controls and basically stacks 2 of the same nav bars on top. Can I have a different nav bar for the photogallery? Here is the View controllers:
FirstView.H
#import <UIKit/UIKit.h>
#interface IBFirstViewController : UIViewController <UIImagePickerControllerDelegate, UINavigationControllerDelegate>
#property (weak, nonatomic) IBOutlet UILabel *userName;
#property (weak, nonatomic) IBOutlet UILabel *userEmail;
#property (weak, nonatomic) IBOutlet UIImageView *backgroundImage;
- (IBAction)logout:(id)sender;
- (IBAction)edit:(id)sender;
#end
FirstView.M
- (IBAction)edit:(id)sender {
UIImagePickerController *imagePickerController = [[UIImagePickerController alloc]init];
imagePickerController.modalPresentationStyle = UIModalPresentationCurrentContext;
imagePickerController.delegate = self;
[self presentViewController:imagePickerController animated:NO completion:Nil];
}

Answer 1

I have similar problem when using [UINavigationBar appearance] to custom navigation bar on iOS7. If we do that, all iOS native controller which is subclass of UINavigationController, is effected too, ex: UIImagePickerController, MFMessageComposeViewController...
If you want to use custom navigation style within your controllers, you have to apply with your UINavigationController instance instead of using [UINavigationBar appearance] singleton.
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
...
UINavigationController *navigationController = (UINavigationController*)self.window.rootViewController;
[navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:#"navBar"] forBarMetrics:UIBarMetricsDefault];
...
}
Or in my case, I create subclass of UINavigationController
- (void)viewDidLoad
{
[super viewDidLoad];
[self setupAppearance];
...
}
- (void)setupAppearance
{
[self.navigationBar setBackgroundImage:[UIImage imageNamed:#"navBar"]
}
Then, when you create UIImagePickerController instance, just custom its navigation bar
- (IBAction)edit:(id)sender {
UIImagePickerController *imagePickerController = [[UIImagePickerController alloc]init];
imagePickerController.modalPresentationStyle = UIModalPresentationCurrentContext;
imagePickerController.delegate = self;
// Custom another navigation style
[imagePickerController.navigationBar setBackgroundImage:[UIImage imageNamed:#"NEW-NAV-BAR-IMAGE"];
[self presentViewController:imagePickerController animated:NO completion:Nil];
}