Question

I have an About View which I push onto a NavigationController. The view has one UILabel which is connected to an IBOutlet. In viewDidLoad I populate the UILabel with the bundle version number (a string). Testing with instruments suggested that the line marked with a comment is leaking memory: –

viewDidLoad {
    [super viewDidLoad];

    self.title = @"About";
    // Line below is the suggested culprit ***
    NSString *versionLabel = [[NSString alloc] initWithFormat:@"Version %@", 
                              [[[NSBundle mainBundle] infoDictionary] objectForKey:(NSString *)kCFBundleVersionKey]];

    self.applicationVersion.text = versionLabel;
    [versionLabel release];
    versionLabel = nil;
}

I’m assuming it is suggesting the NSString and not anything else on the line …

My questions is Why ?

Answer 1

It may actually be the mainBundle or infoDictionary that is leaking – it is possible that the system is caching one or other of those and thus they are being created and then never released.

Try adding in to your applicationDidFinishLaunching the code:

[[NSBundle mainBundle] infoDictionary];

Without any other code and see if Leaks points to that line as the location of the leak. In that case, caching is the issue and you can ignore it.