Here is a link to a post that describe how you can use interface builder and proportional constraints (%):

If the direct link doesn’t work, make sure to go to the post that start with:

Using Xcode 6.0, you can now specify proportional width or height in Interface Builder. Steps for percentage height from superview:

While both the child view and its superview are selected, add an “equal height” constraint (or “equal width” if you wish to have a proportional width).

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