UINavigationBar:appearance works but not UINavigationBar:appearanceWhenContained in

Question

I have a requirement to set the navigation bar to a custom color and this following code will do that:

[[UINavigationBar appearance]
            setBackgroundIma         


        

Answer 1

Indeed, like @rickster said, the appearanceWhenContainedIn: method customizes the appearances for instances of a class contained WITHIN an instance of a container class, or instances in a hierarchy.

Not in every case you have a set of contained class you want to customize, but different containers. The solution to be able to customize several components is simply by creating an array of the classes you need to customize, and iterate! Like so:

NSArray *navigationClass = [NSArray arrayWithObjects:[BSNavigationController class], [DZFormNavigationController class], nil];

for (Class class in navigationClass)
{
    //// Customize all the UINavigationBar background image tilling
    [[UINavigationBar appearanceWhenContainedIn:class, nil] setBackgroundImage:[UIImage imageNamed:@"yourImage"] forBarMetrics:UIBarMetricsDefault];
    [[UINavigationBar appearanceWhenContainedIn:class, nil] setTintColor:[UIColor blackColor]];

    // Title Text Attributes
    NSDictionary *titleAttributes = [NSDictionary dictionaryWithObjectsAndKeys:
                                     [UIColor whiteColor], UITextAttributeTextColor,
                                     [UIColor darkGrayColor], UITextAttributeTextShadowColor,
                                     [UIFont boldSystemFontOfSize:20.0], UITextAttributeFont,
                                     [NSValue valueWithUIOffset:UIOffsetMake(0, 1)], UITextAttributeTextShadowOffset,nil];

    //// Customize all the UINavigationBar title attributes
    [[UINavigationBar appearanceWhenContainedIn:class, nil] setTitleTextAttributes:titleAttributes];
}