#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