OC 单例实现

 

 

2. 在.h 文件遵循 <NSCopying,NSMutabalecopying>

 

3.定义宏，实现任意类型单单例

 

?

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#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

　　
4.使用 括号里的名字 自己定义，但是h和m文件要一样

在 .h文件

 在.m文件