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Can I set all navigation bar properties from the class rather than inside AppDelegate?

So I was wondering if there was a way to set the UINavigationBar appearance from inside the Navigation controller so it's not in the middle of AppDelegate.

So this is what I did but I am not sure how correct it is. Inside the Navigation controller class I modified the original method to set the properties and then I called it inside the method "viewWillAppear"

- (void)viewWillAppear:(BOOL)animated {
    [self setupAppearance];

- (void)setupAppearance {

    UINavigationBar *navigationBar = [self navigationBar];

    navigationBar.barTintColor = [UIColor colorWithRed:77.0/255.0 green:164.0/255.0 blue:191.0/255.0 alpha:1.0f];
    navigationBar.tintColor = [UIColor whiteColor];
    navigationBar.titleTextAttributes = @{NSForegroundColorAttributeName:[UIColor whiteColor]};


Thanks a lot for the help.