Calculating Aspect Ratio for all sizes of iphone

Question

I know this types question has been asked several times but i am newer to iphone so confused with all answers.As my logo is 61*57 and i want to change according to size of iphon

Answer 1

So first You give X , Y and aspect ration to the icon

Then you give your icon's heigh equal to superview's height

Then you divide your current icon's height by superview's height that you just gave

the you write that divided answer in Equal height to: Superview's Multiplier:

And its done