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    <p>I was able to do it by doing something like this: </p> <pre><code>NSNumber *sepHeight = @60.0F; // Center the two views horizontally [self.view addConstraint:[NSLayoutConstraint constraintWithItem:imageView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeCenterX multiplier:1 constant:0]]; [self.view addConstraint:[NSLayoutConstraint constraintWithItem:button attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeCenterX multiplier:1 constant:0]]; // Position the two views one below the other, using the separator height defined above [self.view addConstraints:[NSLayoutConstraint constraintsWithVisualFormat:@"V:[imageview]-sepHeight-[button]" options:0 metrics:NSDictionaryOfVariableBindings(sepHeight) views:views]]; // Force the button distance from the bottom to be the half of the size of the content CGFloat constant = (imageview.frame.size.height + button.frame.size.height + [sepHeight floatValue]) / 2.0; [self.view addConstraint:[NSLayoutConstraint constraintWithItem:button attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:self.view attribute:NSLayoutAttributeCenterY multiplier:1 constant:constant]]; </code></pre> <p>The tricky part is the constant value. That value is the half of the height of all the views, including their separators. This means that, if the imageview's height is 360, the button's height is 70 and the separator is 60, that constant will be (360 + 70 + 60)/2 = 245.</p> <p>There should be a smarter way, indeed, but for now I think this is ok.</p>
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    1. POCenter two views vertically using NSLayoutConstraint
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    1. USFabiano Francesconi
    1. USFabiano Francesconi
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    1. POCenter two views vertically using NSLayoutConstraint
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    1. COClever! Good example of using the indirectness of Auto Layout thinking, and the coefficient and constant. So, one way to describe it is Coefficient = 0.5 Constant = (imageHeightConstant + imageButtonVerticalSpaceConstant + buttonHeightConstant ) Or did I miss something...? The constants could be stored as CGFloat variables or properties and adjusted for appropriate sizings... :)
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    2. CONo, the multiplier is applied to the self.view.frame.origin.y value and the constant is added to such value. I will now rewrite it using variables.
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