What is a navigation bar in uinavigationcontroller?
A navigation bar is most commonly used within a navigation controller. The UINavigationController object creates, displays, and manages its associated navigation bar, and uses attributes of the view controllers you add to control the content displayed in the navigation bar.
How do I change the appearance of a navigation bar?
Navigation bars have two standard appearance styles: white with dark text or black with light text. Use the barStyle property to select the style. Any changes you make to other navigation bar appearance properties override those inferred from the bar style.
What is a navigation item in uinavigationitem?
Instead, you use a navigation item (an instance of the UINavigationItem class) to specify what buttons or custom views you want displayed. A navigation item has properties for specifying views on the left, right, and center of the navigation bar and for specifying a custom prompt string.
How do I add a navigation bar to an existing interface?
To add a navigation bar to your interface, the following steps are required: Set up Auto Layout rules to govern the position of the navigation bar in your interface. Create a root navigation item to supply the initial title. Configure a delegate object to handle user interactions with the navigation bar.
How do I change the background image of a navigation bar?
To allow complete customization over the appearance of navigation bars, you can additionally provide custom background and shadow images. To provide a custom background image, use the setBackgroundImage(_:for:barMetrics:) method, providing a UIImage object for the appropriate bar position and metrics values.
What are the components of a navigation bar?
The primary components are a left (back) button, a center title, and an optional right button. You can use a navigation bar as a standalone object or in conjunction with a navigation controller object. A navigation bar is most commonly used within a navigation controller.