On Jan 22, 2013, at 8:28 PM, Andy Lee <ag...@mac.com> wrote:
> To be extra fail-safe, you might want to perform a cast to be sure the right
> initWithManager: gets called:
>
> if ([myClass conformsToProtocol:@protocol(MyProtocol)])
> myObj = [(id <MyProtocol>)[myClass alloc] initWithManager:self];
> else
> myObj = [[myClass alloc] init];
This only works for classes that actually declare themselves to be in
conformance with this protocol, though. Even if a class implements all the
methods in a protocol, conformsToProtocol: will return NO if it doesn't have
the protocol name on the @interface (or on the @implementation line).
IMO the nicest way to do this (if you can't make all your classes conform to
the protocol by declaring them as @interface Foo : NSObject
<UKCanInitWithManagerProtocol>, which would definitely be the cleanest
approach), would be:
@protocol UKCanInitWithManagerProtocol
-(id) initWithManager: (Foo*)inManager;
@end
...
if( [myClass respondsToSelector: @selector(initWithManager:)] )
myObj = [(id<UKCanInitWithManagerProtocol>)[myClass alloc]
initWithManager: self];
else
myObj = [[myClass alloc] init];
Though I would recommend choosing a different name. E.g. -initWithBarManager:
if the manager class is called UKBarManager. "Manager" alone is too generic a
word, and someone might have declared it in ObjC++ and taking a C++ object and
then you're screwed.
Cheers,
-- Uli Kusterer
"The Witnesses of TeachText are everywhere..."
http://www.zathras.de
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