Graphics Programs Reference
In-Depth Information
ject), it's not okay to have double the
RSSItem
s and suffer through loading the file
twice.
Figure 29.5 Duplicate RSSItems in memory
NSCopying
Fortunately, there is an easier solution.
RSSChannel
can conform to
NSCopying
.
When a class conforms to this protocol, you can create copies of its instances by sending