Question

For example, if we are to draw a 100 x 100 pixel circle on the main view which covers up the whole screen on the iPad, then instead of using initWithFrame like following 2 steps in viewDidLoad:

UINodeView *nodeView = [[UINodeView alloc] initWithFrame:
                               CGRectMake(x, y, NSNodeWidth, NSNodeHeight)];
nodeView.center = CGPointMake(x, y);

because x and y is more elegantly as self.view.bounds.size.width / 2 to horizontally center the circle, instead of self.view.bounds.size.width / 2 - NSNodeWidth / 2. Is init by a frame first, and then reset the center a good way, or is there a better way, if there is a initWithCenterAndSize?

Answer 1

That’s a fine way of doing it 🙂

I would have gone for generating the positioned frame first to avoid the extra method call but that’s just a matter of personal preference 🙂

If you’re using this alot in your app you could make a category on UIView that implements this (warning, untested code 🙂

- (id)initWithCenter:(CGPoint)point size:(CGSize)size {
    CGRect frame = CGRectMake(point.x-size.width/2,
                              point.y-size.height/2, 
                              size.width,
                              size.height);
    return [self initWithFrame:frame];
}