On Jan 14, 2009, at 2:18 PM, Mohan Parthasarathy wrote:
I have protocol X that is implemented by a few classes of my own.
These
classes are not known directly to my main code but only through the
protocol
(id<protocol>). When my main code tries to addObserver:self to the
object
id<protocol>, i get a warning saying that my protocol does not
implement it.
This would have worked if i used the real object behind. What should
i do ?
Just add a method like addObserver in the protocol and in the real
object
make the method just invoke the [super addobserver]. Or is there a
better
way to solve it ?
Some options:
1. Use `NSObject<MyProtocol>*` instead of `id<MyProtocol>`. Then any
method from class NSObject is allowed along with the protocol's own
methods. Since addObserver: is declared as a class on NSObject, this
should pacify the compiler.
2. Add -addObserver: to the protocol.
3. Create another protocol that includes -addObserver:. Then either
use `id<MyProtocol,MyObserverProtocol>`, or make MyProtocol itself
adopt MyObserverProtocol.
#1 is probably the best, assuming all of your objects are in fact
NSObjects.
--
Greg Parker gpar...@apple.com Runtime Wrangler
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