using UIKit; UIView parentView = new UIView(); UILabel childLabel = new UILabel(); childLabel.Text = "Hello, World!"; parentView.AddSubview(childLabel);In the above example, we created a new UIView object called parentView and a new UILabel object called childLabel. We set the text property of the childLabel to "Hello, World!" and then called parentView.AddSubview(childLabel) to add the childLabel as a subview of the parentView. This method is useful when you want to add one view as a subview of another view in iOS. The library package for this example is the UIKit package. The UIKit is part of the iOS SDK and includes all the essential elements required to develop iOS applications, including tools to manage user interface objects, animations, and touch events.