Container View not available in Xcode Storyboard

Does anyone have any idea why I wouldn't be able to find the Container View in Xcode when on a storyboard? I've added on in this project, but now I can't seem to be able to add another one


I think container views are only available in storyboards. If you are editing an individual view file (an xib), then containers are not available.

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Floating point linear interpolation

c algorithm embedded interpolation linear-interpolation

To do a linear interpolation between two variables a and b given a fraction f, I'm currently using this code: