How to set dynamic width & height of a view in autolayout in iOS?

Question

I have a UIView in my super view.I have set it some constraints.Now I want the size of view should be different on different devices.If I set the fix width & height then I get the wrong result.I have tried to user aspect ratio but that make a view too big or too small on multiple devices.

I want the height & width should increase in equal proportion that it must look same all devices.I want to have flexible height and width of the view.Please tell how to do this?

Here is the image

Thanks in Advance

Answer 1

Use Size Classes. It helps to have different settings for different devices. http://www.raywenderlich.com/83276/beginning-adaptive-layout-tutorial https://youtu.be/IwSTXY0awng?t=2m12s