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

 

3.定义宏，实现任意类型单单例

 

#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