Build Phase Script for copying and signing libReveal in Debug Configuration

RevealBuildPhase.sh

#!/usr/bin/env bash

# Build Phase Script for copying and signing libReveal based on Configuration
# https://gist.github.com/Ashton-W/6db611ac93be2f8bad7f
set -o errexit
set -o nounset

LIBREVEAL_PATH="/Applications/Reveal.app/Contents/SharedSupport/iOS-Libraries/libReveal.dylib"
INJECT_REVEAL="${INJECT_REVEAL:-NO}"

#
copy_library() {
    cp -vRf "$LIBREVEAL_PATH" "${CODESIGNING_FOLDER_PATH}/libReveal.dylib"
}

#
codesign_library() {
    if [ -n "${EXPANDED_CODE_SIGN_IDENTITY}" ]; then
        codesign -fs "${EXPANDED_CODE_SIGN_IDENTITY}" "${CODESIGNING_FOLDER_PATH}/libReveal.dylib"
    fi
}

#
main() {
    if [ "${INJECT_REVEAL}" == "YES" ]; then
        if [ -e $LIBREVEAL_PATH ]; then
            copy_library && codesign_library
            echo "Reveal library copied (INJECT_REVEAL=YES)"
        else
            echo "Reveal library not found at: $LIBREVEAL_PATH"
            echo "set LIBREVEAL_PATH to correct"
        fi
    else
        echo "Did not copy Reveal library (Build Setting INJECT_REVEAL=NO or not set)"
    fi
}

main

Add a Run Script Build Phase that calls this script.

Add a user define Build Setting to enable Reveal injection for certain targets (eg: Debug)

Click the ➕ button at the top of the Build Settings list.

A symbolic breakpoint on UIApplicationMain with the following Debugger Command Action will load Reveal from inside the app.

expr (Class)NSClassFromString(@"IBARevealLoader") == nil ? (void *)dlopen([[NSBundle mainBundle] pathForResource:@"libReveal" ofType:@"dylib"].UTF8String, 0x2) : ((void*)0)

Alternatively, follow the code sample from the official Reveal Integration Guide, see Dynamic Loading.