Making an array property without a backing store. How?
Making an array property without a backing store. How?
- Subject: Making an array property without a backing store. How?
- From: Daryle Walker <email@hidden>
- Date: Mon, 06 Apr 2015 22:01:22 -0400
I have an object like:
@interface MyClass : NSObject
@property (readonly) NSArray * myDatumList;
@property NSArray * myDataList;
@end
The second member is meant to be an actual data member, an array of mutable dictionaries. The first member isn’t supposed to have a backing store; accessing a member of the first array references the corresponding member of the second, then access a dictionary attribute with a custom key.
I have a custom array count and array element read methods for the first member.
The program does nothing now. I checked with my limited debugging skills that the second member has one element, but the first member is looped though as if it has no elements. I see that BOTH “_myDatumList” and “_myDataList” internal members exist, with the former set as NIL. I’ve heard that we used to need to use the “@synthesize” command to create internal members, then a later version of the Objective-C compiler did it automatically. Now I have the reverse problem; the first member gets a backing store automatically, but I do NOT want that; I always want to use the custom array accessor methods to simulate “myDatumList” with pieces of “myDataList.”
So, how can I turn off auto-@synthesize? Using “@dynamic” doesn’t work; it causes a crash due to a missing [MyClass myDatumList] method. I also saw a random page saying that “self.myDatumList” causes this, but “myDatumList” wouldn’t (like the “self.” gives the unwanted backing store have priority over the array accessor methods). Is that accurate?
—
Daryle Walker
Mac, Internet, and Video Game Junkie
darylew AT mac DOT com
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