Easy singleton. Add this to your PCH and every class will be singletonable. Exercise caution.

SingletonMacro

#define WSM_SINGLETON_WITH_NAME(sharedInstanceName) \
+ (instancetype) sharedInstanceName { \
static id sInstance; \
static dispatch_once_t onceToken; \
dispatch_once(&onceToken, ^{ \
sInstance = [[self alloc] init]; \
}); \
return sInstance; \
} \