单例宏

 

#define SingleH(name) +(instancetype)share##name;

 

#if __has_feature(objc_arc)

//条件满足 ARC

#define SingleM(name) static id _instance;\

+(instancetype)allocWithZone:(struct _NSZone *)zone\

{\

static dispatch_once_t onceToken;\

dispatch_once(&onceToken, ^{\

_instance = [super allocWithZone:zone];\

});\

\

return _instance;\

}\

\

+(instancetype)share##name\

{\

return [[self alloc]init];\

}\

\

-(id)copyWithZone:(NSZone *)zone\

{\

return _instance;\

}\

\

-(id)mutableCopyWithZone:(NSZone *)zone\

{\

return _instance;\

}

 

#else

//MRC

#define SingleM(name) static id _instance;\

+(instancetype)allocWithZone:(struct _NSZone *)zone\

{\

static dispatch_once_t onceToken;\

dispatch_once(&onceToken, ^{\

_instance = [super allocWithZone:zone];\

});\

\

return _instance;\

}\

\

+(instancetype)share##name\

{\

return [[self alloc]init];\

}\

\

-(id)copyWithZone:(NSZone *)zone\

{\

return _instance;\

}\

\

-(id)mutableCopyWithZone:(NSZone *)zone\

{\

return _instance;\

}\

-(oneway void)release\

{\

}\

\

-(instancetype)retain\

{\

return _instance;\

}\

\

-(NSUInteger)retainCount\

{\

return MAXFLOAT;\

}

#endif

 

转载于:https://www.cnblogs.com/liuzhenjie/p/5203761.html