Graphics Reference
In-Depth Information
Figure 2.11
The Interface Builder Inspector controls for
contentsCenter
Setting the layer
contents
with a
CGImage
is not the only way to populate the backing
image. It is also possible to draw directly into the backing image using Core Graphics. The
-drawRect:
method can be implemented in a
UIView
subclass to implement custom
drawing.
The
-drawRect:
method has no default implementation because a
UIView
does not
require a custom backing image if it is just filled with a solid color or if the underlying
layer's
contents
property contains an existing image instance. If
UIView
detects that
