swift version of playground framework mismatch

[yangfengzzz]

Swift in my Xcode is 5.4 but your framework provide is compiled by 5.1. The project can't launch properly.

[JustinFincher]

Hi @yangfengzzz that is expected since newer Xcode will pack newer Swift runtime & toolchains which might not be compatible with the one I was using when submitting the project. Currently, I can think of two ways to get around this. One is if you have an iPad, just install Swift Playground and use the playgroundbook file. Another is to manually change the Xcode project to use 5.4, please refer to https://medium.com/xcblog/switching-swift-versions-inside-xcode-using-toolchains-755b28831c43 for a guide. Thanks!