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copied!<p>Presumably you're calling the demo code when the view controller first loads its view, like in <code>viewDidLoad</code> or another life cycle method. The nested subview's geometries won't reflect its constraints until <code>viewDidLayoutSubviews</code> is called. Nothing you do during the initial life cycle of a view controller will make that method arrive any faster. </p> <p><strong>Update 12/30/13:</strong> After testing Aaron Brager's sample code, I now realize that the previous paragraph is incorrect. Apparently, you can force layout in <code>viewDidLoad</code> by calling <code>setNeedsLayout</code> followed by <code>layoutIfNeeded</code>. </p> <p>If you executed the demo code in response to a button click instead, I think you'll see the final geometries of your nested subview logged <em>before</em> the action method completes. </p> <pre><code>- (IBAction)buttonTapped:(id)sender { UIView *view = [[UINib nibWithNibName:@"View" bundle:nil] instantiateWithOwner:nil options:nil][0]; view.frame = CGRectMake(0, 0, 200, 200); [self.view addSubview:view]; [self.view layoutIfNeeded]; NSLog(@"Subviews: %@", view.subviews); } </code></pre> <p>In the latter case, you can request layout on-demand because the view controller has completed its initial setup.</p> <p>But during a view controller's initial setup, how are you going to get the final geometries of your re-usable subview? </p> <p>After you set the content for the re-usable subview, have your view controller ask the subview for its size. In other words, implement a method on your custom view that calculates the size based on the content.</p> <p>For example, if the subview's content is an attributed string, you could use a method like <code>boundingRectWithSize:options:context:</code> to help determine the size of your subview. </p> <pre><code>CGRect rect = [attributedString boundingRectWithSize:CGSizeMake(width, CGFLOAT_MAX) options:NSStringDrawingUsersLineFragmentOrigin context:nil]; </code></pre>

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