I have been trying the following such as pinning, aspect ratio, vertical spacing ,horizontal/vertical spacing,leading/trailing space; but it is not working uniformly for all iPhone screen from iPhone se and above.
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By setting multipliers to correct value you can achieve this. I have tried non-programmatically and only in Xcode 8 :
screenshot showing multiplier for setting in Interface builder
You dont apply constraints for each device anymore. You apply auto layout constraints per size class.
If you are aware each and every iOS devices falls under one of the size class in each orientation. If you aren't aware of size class do read about it.
As to answer your question, 1. You will add constraints which are common across all the size classes to any x any.
2.you can always add constraints specific to size class (What I mean is you can add constraints one size class while uninstall it in other size class if you dont want it)
3.you can select any of the constraint and provide it constant values, multipliers specific to size class (e.g.: you can set the height constraint constant to 50 in CxC while you can set it to 150 in (R x R) without adding a new constraint.