ios - Autolayout: origin and size should change according to width and height factor

Question

Here is a scenario what I needed.

I have put a UIButton on IB (size iPhone4 inch) whose initial frame on IB is x:100,y:100,w:100,h:100. I want the origins and height should change according to device size. for example the width and height of iPhone6 is 375X667, hence the width factor (375/320=1.1718) and height factor (667/568=1.1742). In this scene I want to change my buttons origin X and width with multiply by width factor (1.1718) and origin Y and height with multiply by height factor (1.1782). In this case my button should be shown on x:100X1.1718, y:100X1.1742, w:100X1.1718, h:100X1.1742 .

same thing is needed for iPhone6+.

I can easily achieve this by setting This autoresizing masks. How can I achieve the same by using autolayout? What step should I follow, what constraints should I apply?

My previous question on this

I am attaching some screenshots what i needed by using Autolayout (Achieved with autoresizing mask shown in above image).

My Try:-

Step1:- Take a button of size 100X100 on IB. set its X=100 and y=100. Step2:- applied this constraints.

Answer 1

As pre your question you can set this constraints to your UIButton.

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You are not required to change the constraint which you have set for height and width of UIButton.

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1.) You need to set horizontal space to Button.Leading and Superview.Trailing.

Set constant=0, Priority=1000 and Multiplier=100:320 as I've set in below image.

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2.) You need to set horizontal space to Button.Top and Superview.Bottom.

Set constant=0, Priority=1000 and Multiplier=100:568 as I've set in below image.

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Result

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Hope this solves your problem.