This is an annoying problem for someone like me and for my CuoriiLabs mobile agency that used that pod in several legacy projects.
However, i forked it(from another fork ) so you can still use the library.
just reference it in your pod with
pod 'iOSBlocks', :git => 'https://github.com/garixi/iOSBlocks.git'
You can find it on my Github page https://github.com/garixi/iOSBlocks.