How to make navgationBar hidden again?

Question

I am developing an App in which facing some difficulties, after searching a lot solutions, but it is still not working.

First, I create an App like this

I use the following codes to make the navgationBar hidden in viewWillAppear: method

[self.navigationController.navigationBar setBackgroundImage:[UIImage new]
                                              forBarMetrics:UIBarMetricsDefault];
self.navigationController.navigationBar.shadowImage = [UIImage new];
self.navigationController.navigationBar.translucent = YES;
self.navigationController.view.backgroundColor = [UIColor clearColor];
self.navigationController.navigationBar.backgroundColor = [UIColor clearColor];

But after I take a photo using UIImagePickerController, the navgationBar will appear on the screen,

like the this:

So, how can I make the navgation bar always hidden? Thanks a lot..

=============== Update =============

I also used UIImagePickerController to choose photo from library, while it works well. After I have chosen and back to this viewController, the bar still hide. It's really strange.

Answer 1

If you want hide your navigation Bar once you go back to your viewController after picking image use this two callbacks method

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
   //Your code....
   [self.navigationController.navigationBar setHidden:YES];
}

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
   //Your code....
   [self.navigationController.navigationBar setHidden:YES];
}

But if you want remove the navigation bar from your UIImagePickerViewController the you should subclass the UIImagePickerViewController and in your custom UIImagePicker something like this

.h

#import <UIKit/UIKit.h>

@interface CustomImagePickerController : UIImagePickerController

@end

.m

#import "CustomImagePickerController.h"

@interface CustomImagePickerController ()

@end

@implementation CustomImagePickerController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    [self.navigationController.navigationBar setHidden:YES];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

and then use this class as your UIImagePickerController

Hope this helps