Question

If I have
ClassA.h

1.@property (nonatomic, retain) NSMutableArray *arr;

ClassA.m

-(ClassA) function {

    1.ClassA *obj = [[ClassA alloc] init]; 
    // initialize the arr
    // add another object into the arr
    2. [obj.arr addObject:nameOfAnObject]
    3. return obj; 

}

at ClassB, I want to call (ClassA) function method.What I do is

ClassB.m

-(void)viewDidload {

  1.[super viewDidLoad];
  2.ClassA     *classAinB = [[classA alloc] init];                                                                        
  3.classAinB = [classA function];
  4.[classAinB release];

}

According the rule of memory management,because I own a ClassAinB in ClassB.m, so I free it at the end.

My question is how is the var ClassA which I own in ClassA.m, when should I release it so that after a call back at line 3 of ClassB, I still have the object of ClassA whose arr is containing nameOfAnObject object

Please advice me on this issue. Any comments are welcomed here. Thanks

Answer 1

Add it to the autorelease pool. i.e. return [obj autorelease];. This will make sure the object is sent a release message at the end of the run loop iteration if it no longer has any owner.