Ran into a few (5) little problems when trying this with the 'ob init' demo project.

[hacklschorsch]

Thanks for this @ali-abrar, I have been stuck trying to get our Obelisk mobile app deploy and run on iOS for a while now.

However, I have a hard time getting this to run also.

(I still am a Haskell newbie, sorry if this is all obvious)

I tried to set this up with the Obelisk demo project ob init gives you.

First I fixed the Nix snippet (to have haskellLib and hackGet):

default.nix

project ./. ({ pkgs, hackGet, ... }: {
[...]
  overrides = self: super: {
    obelisk-ios-libfrontend = pkgs.haskell.lib.dontStrip (self.callCabal2nix "obelisk-ios-libfrontend" (hackGet ./dep/obelisk-ios-libfrontend + "/exe") {});
    obelisk-ios-libfrontendconfig = self.callCabal2nix "obelisk-ios-libfrontendconfig" (hackGet ./dep/obelisk-ios-libfrontend + "/lib") {};
  };

, and when trying to compile I got:

src/Frontend.hs:15:8: error:
    parse error on input ‘Obelisk.Frontend.iOS’
   |
15 | import Obelisk.Frontend.iOS
   |        ^^^^^^^^^^^^^^^^^^^^

First was a bit stuped by this error message.

After a while I found this is because "Module names are alphanumeric and must begin with an uppercase letter." (says Google).
And indeed the module is called IOS with a capital I.
(Sorry if I sound ungrateful, but have you actually tried following your own docs?)
So I changed this to a capital 'I':

frontend/src/Frontend.hs

import Obelisk.Frontend.IOS

That gives me:

src/Frontend.hs:15:1: error:
    Could not find module ‘Obelisk.Frontend.IOS’
    Perhaps you meant Obelisk.Frontend (from obelisk-frontend-0.1)
    Use -v (or `:set -v` in ghci) to see a list of the files searched for.
   |
15 | import Obelisk.Frontend.IOS
   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^

... so I (tried around quite a bit until I found out...) added obelisk-ios-libfrontendconfig to library's build-depends in frontend/frontend.cabal.

That gives me:

src/Frontend.hs:64:37: error:
    Variable not in scope: myHtmlHead :: StaticWidget x0 a0
   |
64 |   html <- fmap snd $ renderStatic $ myHtmlHead
   | 

... so I just define that above the pasted code, copying the header from the default 'ob init' project:

frontend/src/Frontend.hs

myHtmlHead = do
      el "title" $ text "Obelisk Minimal Example"
      elAttr "script" ("type" =: "application/javascript" <> "src" =: $(static "lib.js")) blank
      elAttr "link" ("href" =: $(static "main.css") <> "type" =: "text/css" <> "rel" =: "stylesheet") blank

... that throws a few warnings during compilation ("Top-level binding with no type signature", it really rather would have me defined a type for this, eh?) but it does build.

The last few lines of the build log include a

find: ‘install_name_tool’: No such file or directory
find: ‘install_name_tool’: No such file or directory

which is a bit strange, since I have that thing:

[nix-shell:~/Repositories/apple-obsidian-tests]$ which install_name_tool 
/nix/store/m465asx3ymh99z06zxgphh9f82f96kkc-cctools-binutils-darwin-16.0.6-973.0.1/bin/install_name_tool

but maybe this is configured to be pure and install_name_tool needs to be in some dependency list?

[hacklschorsch]

bleh, sorry for the edits, long day staring at stuff I don't understand yet.