使用宏封装单例

一、单例使用

1. 使用方法 .h

 #import <Foundation/Foundation.h>

@interface MineAuthentication :NSObject

SHSingleInstance_H_(AuthenticationManager )

@end

2.使用方法.m

#import "SHMineAuthentication.h"

@interface MineAuthentication ()

@end


@implementation MineAuthentication

SHSingleInstance_M_(AuthenticationManager )


@end

二、单例实现和定义

 //1.单例实现和定义宏--方便.h文件使用

#define SHSingleInstance_H_(name) \

+ (instancetype)shared##name;

//2.单例实现和定义宏--方便.m文件使用

#define SHSingleInstance_M_(name) \

static id _instance = nil; \

+ (instancetype)shared##name \

{ \

static dispatch_once_t onceToken; \

dispatch_once(&onceToken, ^{ \

if (_instance == nil) \

{ \

_instance = [[self alloc] init]; \

} \

}); \

return _instance; \

} \

\

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

{ \

static dispatch_once_t onceToken; \

dispatch_once(&onceToken, ^{ \

if (_instance == nil) \

{ \

_instance = [super allocWithZone:zone]; \

} \

}); \

return _instance; \

} \

\

+ (id)copyWithZone:(struct _NSZone *)zone \

{ \

return _instance; \

} \

+ (id)mutableCopyWithZone:(struct _NSZone *)zone \

{ \

return _instance; \

}

三、单例调用

 [MineAuthenticationsharedAuthenticationManager];

摘录自原文：https://blog.csdn.net/shihuboke/article/details/78235099