NSArray/NSMutableArray : Passed by ref or by value???
- by wgpubs
Totally confused here.
I have a PARENT UIViewController that needs to pass an NSMutableArray to a CHILD UIViewController. I'm expecting it to be passed by reference so that changes made in the CHILD will be reflected in the PARENT and vice-versa. But that is not the case. Both have a property declared as ..
@property (nonatomic, retain) NSMutableArray *photos;
Example:
In PARENT:
self.photos = [[NSMutableArray alloc] init];
ChildViewController *c = [[ChildViewController alloc] init ...];
c.photos = self.photos;
...
...
...
In CHILD:
[self.photos addObject:obj1];
[self.photos addObject:obj2];
NSLog(@"Count:%d", [self.photos count]) // Equals 2 as expected
...
Back in PARENT:
NSLog(@"Count:%d", [self.photos count]) // Equals 0 ... NOT EXPECTED
I thought they'd both be accessing the same memory. Is this not the case? If it isn't ... how do I keep the two NSMutableArrays in sync?
