How to use custom UINavigationBar - objective-c

Question

I have subclass of UINavigationBar.
#interface MyNavigationBar : UINavigationBar
Made some changes and now want that my application NavigationController would use it:
_navigationController = [[UINavigationController alloc] initWithRootViewController:self.viewController];
[_window addSubview:[_navigationController view]];
[self.window makeKeyAndVisible];
I want that _navigationController would have MyNavigationBar
How this could be done ?
Thanks.

Answer 1

You have to create a xib with a UINavaigationController in it. You can then select the navigationBar in Interface Builder and change the class to your subclass of UINavigationBar.
Then to make this a little easier to instantiate I add a category to `UINavigationController like:
#interface UINavigationController (DSCNavigationController)
+ (UINavigationController *)dsc_navigationControllerWithRootViewController:(UIViewController *)rootViewController;
#end
#implementation UINavigationController (DSCNavigationController)
+ (UINavigationController *)dsc_navigationControllerWithRootViewController:(UIViewController *)rootViewController;
{
NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:#"DSCNavigationController" owner:nil options:nil];
NSAssert(1 == [topLevelObjects count], #"DSCNavigationController should have one top level object");
UINavigationController *navigationController = [topLevelObjects objectAtIndex:0];
NSAssert([navigationController isKindOfClass:[UINavigationController class]], #"Should have a UINavigationController");
[navigationController pushViewController:rootViewController animated:NO];
return navigationController;
}
#end
At the top of the class that uses it makes sure to import the category in my case it looks like
#import "UINavigationController+DSCNavigationController"
Then using it looks something like
MyViewController *myViewController = [[MyViewController alloc] init];
UINavigationController *navigationController = [UINavigationController dsc_navigationControllerWithRootViewController:myViewController];

Answer 2

UINavigationController has a read-only property
#property(nonatomic, readonly) UINavigationBar *navigationBar
since it is read-only you have to subclass UINavigationBar and override this property or make it read-write.E.g. :
MyNaviagtionBar *myBar = [[MyNavigationBar alloc] init];
_navigationController.navigationBar = mybar;
Or subclassing:
MyNavigationController.h
#class MyNavigationBar;
#interface MyNavigationController : UINavigationController
#property(nonatomic, strong) MyNavigationBar *navigationBar;
#end
MyNavigationController.m
#implementation MyNavigationController
#synthesize navigationBar = _navigationBar;
#end
And then change
_navigationController = [[UINavigationController alloc] initWithRootViewController:self.viewController];
to
_navigationController = [[MyNavigationController alloc] initWithRootViewController:self.viewController];