snakeninnys-MacBook:~ snakeninny$ sudo xcode-select -s /Applications/Xcode3.app/Contents/Developer

snakeninnysiMac:~ snakeninny$ export THEOS=/opt/theos
snakeninnysiMac:~ snakeninny$ sudo Git clone https://github.com/iOS-Reverse-Engineering-Dev/theos $THEOS Password:
Cloning into '/opt/theos'...
remote: Counting objects: 4116, done.
remote: Total 4116 (delta 0), reused 0 (delta 0)
Receiving objects: 100% (4116/4116), 913.55 KiB | 15.00 KiB/s, done.
Resolving deltas: 100% (2063/2063), done.
Checking connectivity... done

snakeninnysiMac:~ snakeninny$ sudo chmod 777 /opt/theos/bin/ldid

snakeninnysiMac:~ snakeninny$ sudo /opt/theos/bin/bootstrap.sh substrate Password:
Bootstrapping CydiaSubstrate...
Compiling iPhoneOS CydiaSubstrate stub... default target? failed, what?
Compiling native CydiaSubstrate stub... Generating substrate.h header...

snakeninnysiMac:~ snakeninny$ sudo chmod 777 /opt/theos/bin/dpkg-deb

1)  Chose “9” to create a tweak project:
>Choose a Template (required): 9
2)  Enter the name of the tweak project: 
>Project Name (required): iOSREGreetings
3)  Enter a bundle identifier as the name of the deb package:
Package Name [com.yourcompany.iosreproject]: com.iosre.iosregreetings
4)  Enter the name of the tweak author:
>Author/Maintainer Name [snakeninny]: Victor
5)  Enter the bundle identifier, the bundle identifier deponds on what process/application you want to hook/tweak, here I take SpringBoard for instance, so the bundle identifier as `com.apple.springboard`
>[iphone/tweak] “MobileSubstrate Bundle filter [com.apple.springboard]: com.apple.springboard

export THEOS_DEVICE_IP = 10.18.136.168   ## The specifies IP's device will be installed this project

export ARCHS = armv7 arm64           ## Specify CPU architectures. Different CPU architectures should be separated by spaces in the above configuration. Note, Apps with arm64 instructions are not compatible with armv7/armv7s dylibs, they have to link dylibs of arm64. In the vast majority of cases, just leave it as “armv7 arm64”.

export TARGET = iphone:clang:latest:8.0   ## Specify the SDK version

include theos/makefiles/common.mk     ## This is a fixed writing pattern, don’t make changes.

TWEAK_NAME = iOSReGreetings          ## The tweak name, i.e. the “Project name” in NIC when we create a Theos project. It corresponds to the “Name” field of the control file, please don’t change it.

iOSReGreetings_FILES = Tweak.xm      ## Source files of the tweak project, excluding headers; multiple files should be separated by spaces, like: `iOSREProject_FILES = Tweak.xm Hook.xm New.x ObjC.m ObjC++.mm`

iOSReGreetings_FRAMEWORKS = UIKit    ## Import frameworks. 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 = AppSupport ChatKit IMCore`


include $(THEOS_MAKE_PATH)/tweak.mk        ## According to different types of Theos projects, different .mk files will be included. In the beginning stage of iOS reverse engineering, 3 types of projects are commonly created, they are Application, Tweak and Tool, whose corresponding files are application.mk, tweak.mk and tool.mk respectively. It can be changed on demand.

after-install::
    install.exec "killall -9 SpringBoard"    ## I guess you know what’s the purpose of these two lines of code from the literal meaning, which is to kill SpringBoard after the tweak is installed during development, and to let CydiaSubstrate load the proper dylibs into SpringBoard when it relaunches.

%hook SpringBoard
- (void)applicationDidFinishLaunching:(id)application {
   %orig;
   UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Come to http://bbs.iosre.com for more fun!" message:nil delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
   [alert show];
   [alert release]; }
%end

%hook Indicates that what class name you want to hook ,with ending of %end
%log Prints logs to `/var/log/syslogd` 
%orig Performs the hooked original method, like OC's syntax : [super method]
%group Indicates that %group groups many of %hook , with ending of %end
%init Indicates that it is initialized a certain %group, and it works after initialized, and %init has to be called in a %hook
%ctor It is tweak's constructor，if you do not call it, theos will automatically generate a %ctor and call %init(_ungrouped) implicitly or explicitly, i.e. %ctor { %init(_ungrouped)}
%new Indicates that the directive is to add new method to a class, just like class_addMethod in OC Runtime
%c Indicates that the directive is trying to get a class name of string formatted, just like objc_getClass in OC Runtime。

Package: com.victor.iosregreetings
Name: iOSReGreetings
Depends: mobilesubstrate, firmware (>= 8.0)
Version: 1.0
Architecture: iphoneos-arm
Description: This is my first tweak project , very simple!
Maintainer: Victor
Author: Victor
Section: Tweaks
Homepage: http://www.googleplust.party

cd iOSReGreetings/
make package install