Scripts for managing env vars in Xcode and CI. Here is an article with detailed description: https://kazaimazai.com/secret-env-vars-xcode-ci

env-example.xcconfig

SECRET_ONE = SECRET_ONE_EXAMPLE_VALUE
SECRET_TWO = SECRET_TWO_EXAMPLE_VALUE

env_vars.init.sh

#!/bin/bash

# This script should be run as a phase script before building the project
#
# The script:
# 1. Copies .env-example.xcconfig to .env.xcconfig if .env.xcconfig does not exist

# Skip if index build
if [ $ACTION = "indexbuild" ]; then exit 0; fi

echo "EnvironmentVars init"

CONFIGURATION_PATH="${SRCROOT}/ProjectName/Configuration/EnvironmentVars" 

# Path to the env.xcconfig file
xcconfig_file="${CONFIGURATION_PATH}/env.xcconfig"

if [ -f "$xcconfig_file" ]; then
  echo "The file '$xcconfig_file' found."
else
  echo "The file '$xcconfig_file' does not exist."
  example_xcconfig_file="${CONFIGURATION_PATH}/env-example.xcconfig"
  cp "$example_xcconfig_file" "$xcconfig_file"
  echo "Copied from '$example_xcconfig_file' to '$xcconfig_file'"
fi

env_vars_codegen.sh

#!/bin/bash

# This script should be run as a phase script before building the project
#
# The script:
# 1. Reads env vars from .env.xcconfig
# 2. Performs EnvironmentVars code generation using Sourcery and EnvironmentVars.stencil template
#
# Important to note: Sourcery path used here is valid for Sourcery CocoaPods installation. Update it if needed

# Skip if index build
if [ $ACTION = "indexbuild" ]; then exit 0; fi

echo "EnvironmentVars CodeGen"

CONFIGURATION_PATH="${SRCROOT}/ProjectName/Configuration/EnvironmentVars"
TEMPLATE_PATH="${CONFIGURATION_PATH}/EnvironmentVars.stencil"

# Path to the env.xcconfig file
xcconfig_file="${CONFIGURATION_PATH}/env.xcconfig"

if ! [ -f "$xcconfig_file" ]; then
    echo "The file '$xcconfig_file' does not exist. Run 'env_vars_init.sh' first."
    exit 1;
fi

echo "Performing EnvironmentVars CodeGen."

# Declare an empty string to hold the env variables in comma separated format
env_vars=""

# Read each line from the xcconfig file
while IFS= read -r line; do
  # Ignore comments and empty lines
  if [[ "$line" =~ ^\s*# ]] || [[ -z "$line" ]]; then
    continue
  fi

  # Extract the variable name and value from the line
  var_name="$(echo "$line" | cut -d'=' -f1 | sed 's/ //g')"
  var_value="$(echo "$line" | cut -d'=' -f2- | sed 's/^ *//;s/ *$//')"

  # Append the variable to the env_vars string
  env_vars+="$var_name=$var_value,"
done < "$xcconfig_file"

# Remove the trailing comma
env_vars="${env_vars%,}"

$PODS_ROOT/Sourcery/bin/sourcery --templates "${TEMPLATE_PATH}" --sources "${CONFIGURATION_PATH}" --output "${CONFIGURATION_PATH}" --args "$env_vars"

env_vars_export.sh

#!/bin/bash

# This script could be run as a phase script if env vars needed
#
# The script:
# 1. Reads env vars from .env.xcconfig
# 2. Exports env vars
# Skip if index build
if [ $ACTION = "indexbuild" ]; then exit 0; fi

echo "EnvironmentVars Export"

CONFIGURATION_PATH="${SRCROOT}/ProjectName/Configuration/EnvironmentVars"
 

# Path to the env.xcconfig file
xcconfig_file="${CONFIGURATION_PATH}/env.xcconfig"

if ! [ -f "$xcconfig_file" ]; then
    echo "The file '$xcconfig_file' does not exist. Run 'env_vars_init.sh' first."
    exit 1;
fi

echo "Performing EnvironmentVars Export..."

# Read each line from the xcconfig file
while IFS= read -r line; do
  # Ignore comments and empty lines
  if [[ "$line" =~ ^\s*# ]] || [[ -z "$line" ]]; then
    continue
  fi

  # Extract the variable name and value from the line
  var_name="$(echo "$line" | cut -d'=' -f1 | sed 's/ //g')"
  var_value="$(echo "$line" | cut -d'=' -f2- | sed 's/^ *//;s/ *$//')"
  export "$var_name"="$var_value"
done < "$xcconfig_file"

echo "EnvironmentVars Exported."

EnvironmentVars.stencil

//swiftlint:disable all

struct EnvironmentVars {
    /// Generated using 'EnvironmentVars.stencil' template

    static let secretNumberOne = "{{ argument.SECRET_ONE }}"
    static let secretNumberTwo = "{{ argument.SECRET_TWO }}"
}

write_env_vars_to_env_config.sh

#!/bin/bash

# This script should be run on CI from project dir as a step before building the project
# First, Make sure that all env vars from .env-example.xcconfig are set on CI
#
# The script:
# 1. Reads all env vars keys defined in env-example.xcconfig
# 2. Writes values from env vars to env.xcconfig

config_path="./ProjectName/Configuration/EnvironmentVars"

# Path to the env.xcconfig file
xcconfig_file="${config_path}/env.xcconfig"

# Path to the env.xcconfig file
example_xcconfig_file="${config_path}/env-example.xcconfig"

# Open the source and destination files for reading and writing
exec 3<$example_xcconfig_file
exec 4>$xcconfig_file

echo "Writing env vars to '$xcconfig_file'..."

# Read the source file line by line and write to the destination file
while read -u 3 line; do
  # Extract the variable name and value from the line
  var_name="$(echo "$line" | cut -d'=' -f1 | sed 's/ //g')"
  default_var_value="$(echo "$line" | cut -d'=' -f2- | sed 's/^ *//;s/ *$//')"

  # Extract the variable value from env vars
  var_value="${!var_name}"

  if [[ -n "$var_value" ]]; then
    echo "$var_name = $var_value" >&4
    echo "Wrote '$var_name' from env vars."
  else
    echo "$var_name = $default_var_value" >&4
    echo "Wrote default value for '$var_name'."
  fi

done

# Close the files
exec 3<&-
exec 4>&-

echo "Wrote env vars to '$xcconfig_file' successfully."

Detailed description and usage example can be found here: https://kazaimazai.com/secret-env-vars-xcode-ci