我想挂钩MPIncomingPhoneCallControlleriOS 5 中的类方法,以便在来电时执行某些操作。我用
Class _$MPIncomingPhoneCallController = objc_getClass("MPIncomingPhoneCallController");
MSHookMessage(_$MPIncomingPhoneCallController, 
              @selector(updateLCDWithName:label:breakPoint:), 
             (IMP) &Hook_LCD, 
             "pre_");
钩住updateLCDWithName:label:breakPoint:,但它失败了。
我怎样才能做到这一点?