How to align a subview to the center of a parent NSView

I'm developing a program in which I am programmatically adding an NSImageView to a custom NSView class. While creating the image-view, I am passing the frame of the parent container.

-(NSImageView *)loadNSImage:(NSString *)imageName frame:(NSRect)frame{
    imageName = [[NSBundle mainBundle] pathForResource:imageName ofType:@"png"];
    NSImage *image = [[NSImage alloc] initWithContentsOfFile:imageName]; 
    NSImageView *imageView = [[NSImageView alloc]initWithFrame:frame];
    [imageView setImage:image];
    [imageView setImageScaling:NSImageScaleProportionallyUpOrDown];
    [imageView setAutoresizingMask:NSViewHeightSizable | NSViewWidthSizable | NSViewMaxXMargin | NSViewMaxYMargin | NSViewMinXMargin | NSViewMinYMargin];
    [imageView setImageAlignment:NSImageAlignCenter];
    [image release];
    return imageView;
}

Then I am using the addSubView method to add this into the Custom View. The problem is that the image sticks to the bottom-left of the parent view. How can I place this image in the center of the parent view?

I have tried adding an offset to the frame origin, but that doesn't really work when the window is resized, or if an image with a different size is loaded.

Any help would be appreciated.