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I'm trying to update an app to use autolayout and I am wondering what units are used to specify constraints. They are referred to as points. But are they pixels? That would seem to defeat the intended utility of autolayout. Do points map to pixels in a consistent way? Can one set the units anywhere? Using percentages strikes me as potentially very helpful. I haven't been able to find the official definition anywhere.
UPDATE: I found part of the information and put it as an answer. This actually makes me more confused: if you put two buttons with a separation constraint of 10 points, the on-screen separation is different for iPhone vs iPad (they appear closer on iPad since 10/ 768 is less than 10/320). Is there a way around this using Interface Builder (i.e. avoiding coding the constraints?).
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To create constraints select the button and click the Align icon in the auto layout menu. A popover menu will appear, check both “Horizontal in container” and “Vertically in container” options to center the button on the screen. Then click the “Add 2 Constraints” button. Run the application.
Most constraints define a relationship between two items in our user interface. These items can represent either views or layout guides. Constraints can also define the relationship between two different attributes of a single item, for example, setting an aspect ratio between an item's height and width.
Auto Layout constraints allow us to create views that dynamically adjust to different size classes and positions. The constraints will make sure that your views adjust to any size changes without having to manually update frames or positions.
Select the view you would like to constrain. Then tap the button to the right of the one you have selected and use that menu to define your autolayout constraints. If you want it to work for all devices make sure your storyboard is on the wAny hAny size class setting.
Alright, I found part of the answer. It's here
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