On Nov 15, 2012, at 3:17 PM, Graham Cox <graham....@bigpond.com> wrote: > I have a formal protocol for a notification callback I want to make. The > protocol inherits the NSObject protocol. > > The caller accepts only objects conforming to this protocol as its delegate. > When it's time to invoke the callback, I'd like to do so on the main thread, > since the caller can be running on another thread. But > -performSelectorOnMainThread:withObject:waitUntilDone: is not part of the > NSObject protocol, it's part of the methods of NSObject, so my code won't > compile because id<MyProtocol> objects don't include this method. > > How can I invoke a method of my protocol on the main thread? > > > @protocol MyProtocol<NSObject> > > - (void) foo:(Caller*) caller; > > ... > > > @interface Caller : NSObject > > @property (assign) id<MyProtocol> delegate; > > ... > > > > [self.delegate performSelectorOnMainThread:@selector(foo) withObject:self > waitUntilDone:NO]; // method not found
The simple solution is to declare your property as NSObject<MyProtocol>* . -- Greg Parker gpar...@apple.com Runtime Wrangler _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
