How to remove UINavigationController / UINavigationBar background in objective-c? - ios

Question

I have 2 ViewController and first one is rootviewcontroller for NavigationController. I want to remove background of navigationbar in second viewcontroller and just show my navigationitem at top.
How to do that ? and what I should to do when I pop second viewcontroller, navigationbar have its old background not the secendview controller background ?
here is my code :
#implementation testView1
- (void)viewDidLoad
{
[super viewDidLoad];
[button addTarget:self action:#selector(ClickAction) forControlEvents:UIControlEventTouchUpInside ];
self.navigationController.navigationBar.translatesAutoresizingMaskIntoConstraints = false;
self.navigationController.navigationBar.barTintColor = [UIColor blueColor];
self.navigationController.navigationBar.tintColor = [UIColor whiteColor];
self.navigationItem.title = #"Home";
self.navigationController.navigationBar.titleTextAttributes = #{NSForegroundColorAttributeName:[UIColor whiteColor]};
}
-(void)ClickAction
{
testView2 *detail = [self.storyboard instantiateViewControllerWithIdentifier:#"V2"];
[self.navigationController pushViewController:detail animated:YES];
}
#implementation testView2
- (void)viewDidLoad
{
[super viewDidLoad];
self.view.backgroundColor = [UIColor lightGrayColor];
self.title = #"No";
self.navigationController.navigationBar.barTintColor = nil;
self.navigationController.navigationBar.backgroundColor = nil;
self.navigationController.navigationBar.tintColor = nil;
self.navigationController.view.tintColor = nil;
self.navigationController.view.backgroundColor = nil;
UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:#"left-arrow.png"] style:UIBarButtonItemStylePlain target:self action:#selector(Back:)];
backButtonItem.imageInsets = UIEdgeInsetsMake(45, 5, 45, 85);
self.navigationItem.leftBarButtonItem = backButtonItem;
}
-(void) Back:(id) sender
{
[self.navigationController popViewControllerAnimated:YES];
}

Answer 1

In firstcontroller
-(void)viewWillAppear:(BOOL)animated
{
self.navigationController.navigationBar.translatesAutoresizingMaskIntoConstraints = false;
self.navigationController.navigationBar.barTintColor = [UIColor blueColor];
self.navigationController.navigationBar.tintColor = [UIColor whiteColor];
self.navigationItem.title = #"Home";
self.navigationController.navigationBar.titleTextAttributes = #{NSForegroundColorAttributeName:[UIColor whiteColor]};
[super viewWillAppear:animated];
}
and write code in SecondView controller
- (void)viewDidLoad
{
[self.navigationController.navigationBar setBackgroundImage:[UIImage new]
forBarMetrics:UIBarMetricsDefault];
self.navigationController.navigationBar.shadowImage = [UIImage new];
self.navigationController.navigationBar.translucent = YES;
self.navigationController.navigationBar.tintColor = [UIColor clearColor];
self.navigationController.navigationBar.backgroundColor = [UIColor clearColor];
}

Answer 2

ViewController.h file:
- (void)showForViewController:(UIViewController*)controller;
ViewController.m file:
- (void)showForViewController:(UIViewController *)controller {
if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(#"8.0"))
{
self.providesPresentationContextTransitionStyle = YES;
self.definesPresentationContext = YES;
[self setModalPresentationStyle:UIModalPresentationOverCurrentContext];
}
else
{
[self setModalPresentationStyle:UIModalPresentationCurrentContext];
[self.navigationController setModalPresentationStyle:UIModalPresentationCurrentContext];
}
[controller.navigationController presentViewController:self animated:NO completion:nil];
}
I'm using this code for present ViewController with clear background (to see previous controller).