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Re:The Original Macintosh: Calculator Construction Set by coob on Tuesday February 10, 2015 @07:44AM (#9026761)
Xcode 6's additions to Interface Builder allow for similar tools to be built now. Here's a great NSHipster article that details a modern take on the Calculator Construction Set:

http://nshipster.com/ibinspectable-ibdesignable/

Re:The Original Macintosh: Calculator Construction Set by Zelphyr on Tuesday February 10, 2015 @02:08PM (#9029183)
I'm surprised it has taken them this long to get something like that into Xcode.