What is a UIView?
What is a UIView?
UIView can be defined as an object by using which we can create and manage the rectangular area on the screen. We can have any number of views inside a view to create a hierarchical structure of the UIViews. The UIView is managed by using the methods and properties defined in the UIView class that inherits UIKit.
What is loadViewIfNeeded?
loadViewIfNeeded: Loads the view controller’s view if it has not yet been loaded. Calling this method loads the view controller’s view from its storyboard file, or creates the view as needed based on the established rules.
What is Definespresentationcontext?
A Boolean value that indicates whether this view controller’s view is covered when the view controller or one of its descendants presents a view controller.
How do you use the safe area layout guide?
Use safeAreaLayoutGuide for avoid our objects clipping/overlapping from rounded corners, navigation bars, tab bars, toolbars, and other ancestor views. We can create safeAreaLayoutGuide object & set object constraints respectively.
What is the difference between UIView and CALayer?
Each UIView is backed by CALayer which is one level deeper. Views are being drawn using CPU on the main thread. Drawing layers on other hand is on separate thread using GPU power. When you need more flexibility you can move one level down from UIView by using CALayer capabilities.
What are three of the primary responsibilities of a UIView object?
iOS Fundamentals — UIView: Three Major Responsibilities
- drawing and animation,
- layout and subview management, and.
- Event handling.
What is modal presentation IOS?
Modality is a design technique that presents content in a temporary mode that requires an explicit action to exit. Presenting content modally can: Help people focus on a self-contained task or set of closely related options. Ensure that people receive critical information and, if necessary, act on it.
What is safe area layout?
The safe area layout guide is a property of the UIView class and it inherits from the UILayoutGuide class. It was introduced in iOS 11 and tvOS 11. It helps you correctly position views in a layout. The safe area layout guide replaces the top and bottom layout guides of the UIViewController class.
How do you add a safe area to a storyboard?
Select View Controller -> File Inspector (first tab) -> Use safe area layout guides (uncheck the checkbox). You can also change it programmatically in viewDidLoad().
How do you subclass UIView?
The 4 Steps to Properly Subclass UIView
- Create and add subviews.
- Create and add constraints.
- Inject your data.
- Hook up actions and create expose them with a delegate.