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OC|OC - iOS - 宏单例
【OC|OC - iOS - 宏单例】Macro单例
// .h文件的实现#define SingletonH(methodName) + (instancetype)shared##methodName;
// .m文件实现
#if __has_feature(objc_arc) // ARC下#define SingletonM(methodName)\
static id _instance = nil;
\
+ (instancetype)allocWithZone:(struct _NSZone *)zone{\
if (!_instance) {\
static dispatch_once_t onceToken;
\
dispatch_once(&onceToken, ^{\
_instance = [super allocWithZone:zone];
\
});
\
}\
return _instance;
\
}\
\
- (instancetype)init{\
static dispatch_once_t onceToken;
\
dispatch_once(&onceToken, ^{\
_instance = [super init];
\
});
\
return _instance;
\
}\
\
+ (instancetype)share##methodName{\
return [[self alloc] init];
\
}\
\
- (id)copyWithZone:(NSZone *)zone {\
return _instance;
\
}\
+ (id)copyWithZone:(struct _NSZone *)zone {\
return _instance;
\
}\
- (id)mutableCopyWithZone:(NSZone *)zone {\
return _instance;
\
}\
+ (id)mutableCopyWithZone:(struct _NSZone *)zone {\
return _instance;
\
}#else
// 非ARC下
#define SingletonM(methodName)\
static id _instance = nil;
\
+ (instancetype)allocWithZone:(struct _NSZone *)zone{\
if (!_instance) {\
static dispatch_once_t onceToken;
\
dispatch_once(&onceToken, ^{\
_instance = [super allocWithZone:zone];
\
});
\
}\
return _instance;
\
}\
\
- (instancetype)init{\
static dispatch_once_t onceToken;
\
dispatch_once(&onceToken, ^{\
_instance = [super init];
\
});
\
return _instance;
\
}\
\
+ (instancetype)share##methodName{\
return [[self alloc] init];
\
}\
\
- (id)copyWithZone:(NSZone *)zone {\
return _instance;
\
}\
+ (id)copyWithZone:(struct _NSZone *)zone {\
return _instance;
\
}\
- (id)mutableCopyWithZone:(NSZone *)zone {\
return _instance;
\
}\
+ (id)mutableCopyWithZone:(struct _NSZone *)zone {\
return _instance;
\
}\
- (oneway void)release{\
\
}\
\
- (instancetype)retain{\
return self;
\
}\
\
- (NSUInteger)retainCount{\
return 1;
\
}#endif
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