The UINavigationBar is an essential component in iOS app development, often used for providing navigation and displaying titles. One common requirement from designers and developers is the ability to customize the font of the UINavigationBar title or its buttons. In this article, we will explore how to accomplish this using the
NSAttributedString.Key.font in Swift.
In order to tweak the font of the UINavigationBar, we can leverage the power of attributed strings and the
NSAttributedString.Key.font attribute. The
NSAttributedString class allows us to apply custom attributes to specific ranges within a string.
Let's start by customizing the title font of the UINavigationBar. We can achieve this by setting the
titleTextAttributes property of the navigation bar's appearance proxy. Here's an example:
1let navBarAppearance = UINavigationBarAppearance()2navBarAppearance.titleTextAttributes = [NSAttributedString.Key.font: UIFont.boldSystemFont(ofSize: 18)]3UINavigationBar.appearance().standardAppearance = navBarAppearance
In the above code snippet, we create a new instance of
UINavigationBarAppearance and assign it to the
navBarAppearance variable. Then, we set the
titleTextAttributes property of the appearance object, specifying the desired font using the
NSAttributedString.Key.font key. Finally, we apply this appearance to the standard appearance of all UINavigationBars using the
To customize the font of buttons within the UINavigationBar, such as back buttons or bar button items, we can use a similar approach. Here's an example that demonstrates changing the font of the back button:
1let backButtonAppearance = UIBarButtonItemAppearance()2backButtonAppearance.normal.titleTextAttributes = [NSAttributedString.Key.font: UIFont.systemFont(ofSize: 16, weight: .bold)]3UINavigationBarAppearance().backButtonAppearance = backButtonAppearance
In the above code, we create an instance of
UIBarButtonItemAppearance and assign it to the
backButtonAppearance variable. Then, we set the
normal.titleTextAttributes property of the appearance object, specifying the desired font for the back button. Lastly, we assign the appearance to the
backButtonAppearance of the
Customizing the font of UINavigationBar titles and buttons can greatly enhance the visual appeal of your iOS app. By utilizing the power of attributed strings and the
NSAttributedString.Key.font attribute, you can easily tweak the font to match your design requirements. Experiment with different fonts and styles to create a unique and visually pleasing navigation bar for your app.