Microsoft Word - iOSAppReverseEngineering.docx

export TARGET = iphone:clang:8.1:8.0

It specifies the base SDK version of this project to 8.1, as well deployment target to iOS 8.0.

We can also specify “Base SDK” to “latest” to indicate that the project will be compiled with the

latest SDK of Xcode, like:

export TARGET = iphone:clang:latest:8.0

² Import frameworks

iOSREProject_FRAMEWORKS = framework name

For example:

iOSREProject_FRAMEWORKS = UIKit CoreTelephony CoreAudio

There is nothing to explain. However, as tweak developers, how to import private

frameworks attracts us more for sure. It’s not much difference to importing documented

frameworks:

iOSREProject_PRIVATE_FRAMEWORKS = private framework name

For example:

iOSREProject_PRIVATE_FRAMEWORKS = AppSupport ChatKit IMCore

Although it seems to be only one inserted word “ PRIVATE “, there’s more to notice.

Importing private frameworks is not allowed in AppStore development, most of us are not

familiar with them. Private frameworks change a lot in each iOS version, so before importing

them, please make sure of the existence of the imported frameworks. For example, if you want

your tweak to be compatible with both iOS 7 and iOS 8, then Makefile could be written as

follows:

export ARCHS = armv7 arm64

export TARGET = iphone:clang:latest:7.0

include theos/makefiles/common.mk

TWEAK_NAME = iOSREProject

iOSREProject_FILES = Tweak.xm

iOSREProject_PRIVATE_FRAMEWORK = BaseBoard

include $(THEOS_MAKE_PATH)/tweak.mk

after-install::

install.exec "killall - 9 SpringBoard"

This tweak can be compiled and linked successfully without any error. However,

BaseBoard.framework only exists in SDK of iOS 8 and above, so this tweak would fail to work

on iOS 7 because of the lack of specified frameworks. In this case, “weak linking” or dyld series

functions like dlopen(), dlsym() and dlclose() can solve this problem.