On 2012-07-11, at 10:03 AM, Dave DeLong <davedel...@me.com> wrote: > It sounds like the OP is looking for a model object that uses an > NSMutableDictionary as the backing store for its properties, as opposed to > individual ivars. You can do this. > > You declare all your properties, and you declare a single NSMutableDictionary > ivar. All of the properties should be implemented as @dynamic in the .m file. > > Since the properties are dynamic, the compiler will not generate > implementations for them. You'll have to do that yourself at runtime. > Fortunately, if you know what you're doing, that's not too hard. > > You'll have to override +resolveInstanceMethod: to figure out what the user > is trying to do: get or set. You'll use the selector passed in to derive the > key under which you're storing the data in the dictionary. With this > information, you construct a block of the appropriate signature, capturing > whatever information you need, and turn it into an IMP using > imp_implementationWithBlock(). You can then add that method to the class > using class_addMethod(). >
Another way would be to override the invocation forwarding mechanism (-forwardInvocation: and -methodSignatureForSelector:) to funnel all the messages through a single getter/setter; this would (possibly) mean that less code is generated at runtime, perhaps at the expense of some added complexity and performance degradation. I think, however, that the best solution here is to just adopt a newer compiler; recent versions of LLVM are capable of automatically synthesizing properties[1], and provide support for both literals and boxed expressions[2], which make initializing and using both NSArray and NSDictionary much closer to what the OP was looking for. —Mt. [1]: “Objective-C Autosynthesis of Properties” in http://clang.llvm.org/docs/LanguageExtensions.html#objc_lambdas [2]: http://clang.llvm.org/docs/ObjectiveCLiterals.html _______________________________________________ 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
