The center of the frame.
- iOS 2.0+
- tvOS 9.0+
The center is specified within the coordinate system of its superview and is measured in points. Setting this property changes the values of the
frame properties accordingly.
Changing the frame rectangle automatically redisplays the receiver without invoking the
draw(_:) method. If you want the
draw(_:) method invoked when the frame rectangle changes, set the
content property to