Key UIView properties include:

• frame: Position and size in superview's coordinate system
• bounds: Internal coordinate system (always origin at 0,0)
• center: Center point in superview coordinates
• backgroundColor: Background color of the view
• alpha: Transparency level (0.0 to 1.0)
• isHidden: Visibility state
• tag: Integer identifier for finding views
• superview: Parent view reference
• subviews: Array of child views