#define Singleton_h(name) + (instancetype)shared##name;
#if __has_feature(objc_arc) // 是arc环境
#define Singleton_m(name) + (instancetype)shared##name {\
return [[self alloc] init];\
}\
\
+ (instancetype)allocWithZone:(struct _NSZone *)zone {\
static dispatch_once_t onceToken;\
static id instance = nil;\
dispatch_once(&onceToken, ^{ \
instance = [super allocWithZone:zone];\
});\
return instance;\
}\
\
- (id)copyWithZone:(nullable NSZone *)zone {\
return self;\
}
#else // MRC环境
#define HMSingleton_m(name) + (instancetype)shared##name {\
return [[self alloc] init];\
}\
\
+ (instancetype)allocWithZone:(struct _NSZone *)zone {\
static dispatch_once_t onceToken;\
static id instance = nil;\
dispatch_once(&onceToken, ^{ \
instance = [super allocWithZone:zone];\
});\
return instance;\
}\
\
- (id)copyWithZone:(nullable NSZone *)zone {\
return self;\
}\
- (oneway void)release {\
\
}\
\
- (instancetype)autorelease {\
return self;\
}\
\
- (instancetype)retain {\
return self;\
}\
\
- (NSUInteger)retainCount {\
return 1;\
}
#endif