optool is a popular open-source command-line utility designed specifically to interact with Mach-O binaries and insert load commands. Copy your custom dylib into the .app bundle: cp my_tweak.dylib Payload/AppName.app/ Use code with caution.
Ensure your dylib does not rely on substrate/substitute frameworks (like CydiaSubstrate) unless you also embed those dependencies into the IPA.
Create a new dylib project using Theos. You'll need to create a new directory for your project and create a Makefile and Tweak.xm file. Inject Dylib Into Ipa
If the manual process seems daunting, is a powerful CLI tool that automates the entire workflow. It can inject dylibs, frameworks, and resources into an IPA with a single command:
Alternatively, using insert_dylib :
For command-line operations and signing certificates. Step-by-Step Injection Process 1. Decrypt the IPA
: If your dylib relies on other libraries that do not exist on a stock, non-jailbroken iOS device, the app will crash instantly. Ensure all external framework dependencies are bundled into the IPA and mapped properly using @executable_path . Create a new dylib project using Theos
(using a developer certificate):
(older, for 32-bit mostly)