保留视图控制器的计数

Question

I am trying to print the retain count of a view controller in the viewDidLoad method. The value returned is 3 .

Can someone please tell why is the value 3 ?

My code is as follows

@implementation ViewController

    - (void)viewDidLoad
    {
        [super viewDidLoad];
        NSLog(@"Retain count in View Did Load is %ld", CFGetRetainCount((__bridge CFTypeRef)(self)));

    }

Answer 1

I wouldn't worry about it. retainCount is often temporarily higher than you might expect. Add a -dealloc method for debugging/unit tests and make sure it is called when the viewController is dismissed and you'll be fine.

Answer 2

Well, it's 25 for me:

2015-11-18 19:53:51.323 test[61900:10880987] Retain count in View Did Load is 25

You can't rely on the retain count being any particular number (except that it won't be zero).

If you really want to know how it ended up where it did, use Instruments: