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Mobile app development with LiveView Native and Elixir

Rushikesh Pandit on June 24, 2024

What is LiveView Native Introducing LiveView Native, the cutting-edge framework from Dockyard Do more with less, with LiveView...

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Devin Mork • Jul 21

This post just convinced me to build my startup on Phoenix instead of Rails. Thank you!

Marat • Jun 26

Hi! Great article! Long-waited native development is coming!
However, I get error when I try to run mix lvn.swiftui.gen:

mix lvn.swiftui.gen
** (KeyError) key "swiftui" not found in: %{}
    :erlang.map_get("swiftui", %{})
    (live_view_native 0.3.0-rc.1) lib/live_view_native.ex:125: LiveViewNative.fetch_plugin!/1
    (live_view_native 0.3.0-rc.1) lib/mix/live_view_native/context.ex:60: Mix.LiveViewNative.Context.get_module_suffix/1
    (live_view_native 0.3.0-rc.1) lib/mix/live_view_native/context.ex:33: Mix.LiveViewNative.Context.build/2
    (live_view_native_swiftui 0.3.0-rc.1) lib/mix/tasks/lvn.swiftui.gen.ex:30: Mix.Tasks.Lvn.Swiftui.Gen.run/1
    (mix 1.16.0) lib/mix/task.ex:478: anonymous fn/3 in Mix.Task.run_task/5
    (mix 1.16.0) lib/mix/cli.ex:96: Mix.CLI.run_task/2
    /Users/marat/.asdf/installs/elixir/1.16.0/bin/mix:2: (file)

Do you know what might be wrong?

Followed your instructions.
Versions

Erlang/OTP 26 [erts-14.1] [source] [64-bit] [smp:16:16] [ds:16:16:10] [async-threads:1] [jit:ns]

Elixir 1.16.0 (compiled with Erlang/OTP 24)

Marat • Jun 26

Solved by adding

config :live_view_native, plugins: [
  LiveViewNative.SwiftUI
]

to config.exs as described in the liveview-native/live_view_native readme.

Rushikesh Pandit • Jun 27

Hi Marat, happy that you are able to solve it by yourself. In case you miss to add LiveView Native changes into your project, use mix lvn.gen --no-copy command to get the list of all the changes that we need to integrate manually.

Marat • Jun 26

Opening prj file in the Xcode results in the following notice:

My Xcode version is 15.3. What should I do in this case?

Rushikesh Pandit • Jun 27

Hi Marat, seems like existing code is written with Swift 3 which is not supported by your xcode version. Try to delete "native" folder and recreate it using command mix lvn.swiftui.gen

Let me if this helps you.

Marat • Jun 27

I removed native folder, ran mix lvn.swiftui.gen and opened .xcodeproj file.
The Xcode shows me same dialog window with text:

The target “QuizArena” contains source code developed with Swift 3.x. This version of Xcode does not support building or migrating Swift 3.x targets.

Use Xcode 10.1 to migrate the code to Swift 4.

I don't have Xcode 10.1.

Does it mean this approach will not work for me?

Rushikesh Pandit • Jun 27

Hi Marat. I belive this might be some environment related issue. Please email me on rushikesh.d.pandit@gmail.com with your good time to connect and we can take a look at it. I will be happy to help you.

Marat • Jun 28

Thank you!

Marat • Jun 29 • Edited

Recap: to enable the successful build on the MacOS Sonoma Xcode 15 we had to add the following adjustments:

Set Swift version 15 in the project Build Settings:

Since I didn't have the iOS build type in the build platform list

I had to download the iPhone simulator by opening Xcode > Settings > Platform, and downloading iOS 17 simulator, and also iPhone 15 simulator available under + button.