Microsoft Word - iOSAppReverseEngineering.docx

NSLog(@"You’ve pressed home button but it’s not functioning.");

}

%end

It can also be used to replace arguments of the original method, for example:

%hook SBLockScreenDateViewController

• (void)setCustomSubtitleText:(id)arg1 withColor:(id)arg2
  {
  %orig(@"iOS 8 App Reverse Engineering", arg2);
  }
  %end

The lock screen looks like figure 3-4 with the new argument:

Figure 3- 4 Hack the lock screen

Besides %hook, %log and %orig, there are other common preprocessor directives such as

%group, %init, %ctor, %new and %c.

² %group

This directive is used to group %hook directives for better code management and

conditional initialization (We’ll talk about this soon). %group must end with %end, one %group

can contain multiple %hooks, all %hooks that do not belong to user-specific groups will be

grouped into %group _ungrouped. For example:

%group iOS7Hook

%hook iOS7Class

• (id)iOS7Method
  {
  id result = %orig;