Question

I am doing this :

UIImageView *backgroundImage = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"mainback.jpg"]];

[self.view addSubview:backgroundImage];
NSLog(@" retain count1 : %d " , [backgroundImage retainCount]);
[self.view sendSubviewToBack:backgroundImage];

[backgroundImage release];
NSLog(@" retain count2 : %d " , [backgroundImage retainCount]);

I got

retain count1 : 2 
retain count2 : 1

1 ) in dealoc function can i get message like :

- (void)dealloc{

NSLog(@" retain count2 : %d " , [backgroundImage retainCount]);
[super dealloc];
}

And 2) at last i got retain count 1 for backgroundimage so it is ok or it should be 0(zero)??

Thanks..

Answer 1

According to the Apple docs,

The retainCount method does not account for any pending autorelease
messages sent to the receiver.

Important: This method is typically of no value in debugging memory
management issues. Because any number of framework objects may have
retained an object in order to hold references to it, while at the
same time autorelease pools may be holding any number of deferred
releases on an object, it is very unlikely that you can get useful
information from this method. To understand the fundamental rules of
memory management that you must abide by, read “Memory Management
Rules”. To diagnose memory management problems, use a suitable tool:
The LLVM/Clang Static analyzer can typically find memory management
problems even before you run your program. The Object Alloc instrument
in the Instruments application (see Instruments User Guide) can track
object allocation and destruction. Shark (see Shark User Guide) also
profiles memory allocations (amongst numerous other aspects of your
program).