[SOLVED] Is there any graceful way could revert the hooked method to original implementation on iOS?

Is there any graceful way could revert the hooked method to original implementation on iOS?

With CydiaSubstrate we could easily hook the methods as below, but I want to know how can I uninstall the hooking and revert the implementation to original one? Thank you!

static IMP original_UIView_setFrame_;
void replaced_UIView_setFrame_(UIView* self, SEL _cmd, CGRect frame) {  // Note the implicit self and _cmd parameters are needed explicitly here.
  CGRect originalFrame = self.frame;
  NSLog("Changing frame of %p from %@ to %@", self, NSStringFromCGRect(originalFrame), NSStringFromCGRect(frame));
  original_UIView_setFrame_(self, _cmd, frame);    // Remember to pass self and _cmd.
}
...
MSHookMessageEx([UIView class], @selector(setFrame:), (IMP)replaced_UIView_setFrame_, (IMP *)&original_UIView_setFrame_);

Solution

You just need to exchange the implementations again, i.e. just call the following a second time:

MSHookMessageEx([UIView class], @selector(setFrame:), (IMP)replaced_UIView_setFrame_, (IMP *)&original_UIView_setFrame_);

When you exchange the implementations you are swapping them around, so by swapping them again you get back to the originals.