没有做过多测试，了解方法即可！

用IDA高版本（到官方下载DEMO即可）加载 PLClient                                     
                                                                                   
由于是要解锁歌曲，索引用关键字 “song、lock”等搜索函数列表，碰碰运气  （当然我之前用GDB调试过的，O(∩_∩)O~）             
                                                                                   
找到如下可疑函数：                                                                 
                                                                                   
GamePlay::GameConfig::IsBuyedSong(int)                                             
GamePlay::MessageManager::IsSongDiffLock(int,GamePlay::EDiffcult)                  
GamePlay::MessageManager::IsSongDiffLockBought(int,GamePlay::EDiffcult)          
GamePlay::MessageManager::IsVIPInTheSong(int)                                      
                        
                                                                                   
目测应该是其中某个了，，用theos一个个尝试，得出结论：                              
IsVIPInTheSong 函数 -- 将歌曲后面的图标由免费变成VIP -- 实际还是没解锁--放过   
IsSongDiffLock 函数 -- 没解锁                                                      
IsSongDiffLockBought -- 顺利解锁 --- 就是它了！                                    
                                                                                   
                                                                                   
所以hook IsSongDiffLockBought 返回1即可                                            
为了满足自己内心需要，你可以把上面几个全hook掉

/* 
**大师 IOS 2.3.2 歌曲解锁
By PiaoYun
http://www.dllhook.com
*/

%hook AppDelegate

// 开启VIP
BOOL (*Kernel_GamePlay_MessageManager_IsVIPInTheSong)(void* self, int Value);

// 购买标记
BOOL (*Kernel_GamePlay_GameConfig_IsBuyedSong)(void* self, int Value);

// 解锁所有歌曲
BOOL (*Kernel_GamePlay_MessageManager_IsSongDiffLockBought)(void* self, int Value);

%new
BOOL My_GamePlay_MessageManager_IsVIPInTheSong(void* self, int Value)
{
  NSLog(@"into My_GamePlay_MessageManager_IsVIPInTheSong!!!!");
  Kernel_GamePlay_MessageManager_IsVIPInTheSong(self, Value);
  return YES;
}

%new
BOOL My_GamePlay_GameConfig_IsBuyedSong(void* self, int Value)
{
  NSLog(@"into My_GamePlay_GameConfig_IsBuyedSong!!!!");
  Kernel_GamePlay_GameConfig_IsBuyedSong(self, Value);
  return YES;
}

%new
BOOL My_GamePlay_MessageManager_IsSongDiffLockBought(void* self, int Value)
{
  NSLog(@"into My_GamePlay_MessageManager_IsSongDiffLockBought!!!!");
  Kernel_GamePlay_MessageManager_IsSongDiffLockBought(self, Value);
  return YES;
}

__attribute__((constructor)) void dylibMain()
{
  NSLog(@"inject success!!!!");
  MSHookFunction(((void*)MSFindSymbol(NULL, "__ZN8GamePlay14MessageManager14IsVIPInTheSongEi")),(void*)My_GamePlay_MessageManager_IsVIPInTheSong, (void**)&Kernel_GamePlay_MessageManager_IsVIPInTheSong);
  MSHookFunction(((void*)MSFindSymbol(NULL, "__ZN8GamePlay10GameConfig11IsBuyedSongEi")),(void*)My_GamePlay_GameConfig_IsBuyedSong, (void**)&Kernel_GamePlay_GameConfig_IsBuyedSong);
  MSHookFunction(((void*)MSFindSymbol(NULL, "__ZN8GamePlay14MessageManager20IsSongDiffLockBoughtEiNS_9EDiffcultE")),(void*)My_GamePlay_MessageManager_IsSongDiffLockBought, (void**)&Kernel_GamePlay_MessageManager_IsSongDiffLockBought);
}
%end

       

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