Question

I use this code.

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    // Override point for customization after application launch.

    view = [[UIView alloc] init];

    [_window addSubview:view];

    [view release];

    NSLog(@"count - %d", [view retainCount]);

    [self.window makeKeyAndVisible];

    return YES;

}


- (IBAction)click{

    NSLog(@"count - %d", [view retainCount]); 

}

When i click to uibutton – my view retain count = 2.
Why is this happening?

Answer 1

Please do not count on retainCount. Fire up Instruments and see if there is a leak. Apple discourages the use of retainCount for debugging purposes:

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.

Have a look at the NSObjectProtocol and the retainCount documentation. Read the Memory Management Programming Guide for a deeper understanding of retain counts.