For those who what to use stack view in Interface Builder, you can check out my fork

[CosynPa]

https://github.com/CosynPa/TZStackView

[kdubb]

Have a look at my comments in #61. I've been merging your changes into my own branch to get better support in interface builder. Unfortunately your changes are geared toward using TZStackView everywhere. I, and others, want to use TZStackView only on platforms it's not supported.