So Android apks are coded in java while IOS is coded in objective-c so check this out: http://j2objc.org/docs/Getting-Started.html
I do not code but if that thing works then someone could try to get permission and convert blocklauncher and Android mods to IOS.
Yes I kniw that you cannot distribute blocklauncher on the appstore because Apple doesn't allow apps to modify other apps.
But you could make a cydia repo for us jailbreak users and distribute the converted blocklauncher and mods over that.
It would still be more mods than we have for IOS though ¯\_(ツ)_/¯