OC单例 模板封装

1. 单例抽宏  头文件

Singleton.h

//.h 文件的实现

#define SingletonH(methodName) +(instancetype)shared##methodName;

//.m 文件的实现

#if __has_feature(objc_arc)//是 ARC

#define SingletonM(methodName)\

static id _instance = nil;\

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

{\

if (_instance == nil) {\

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)shared##methodName{\

return [[self alloc] init];\

}\

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

    return _instance;\

}\

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

    return _instance;\

}

#else//是 MRC

#define SingletonM(methodName)\

static id _instance = nil;\

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

{\

if (_instance == nil) {\

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)shared##methodName{\

return [[self alloc] init];\

}\

\

-(oneway void)release{}\

-(instancetype)retain{return self;}\

-(NSUInteger)retainCount{return 1;}\

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

    return _instance;\

}\

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

    return _instance;\

}

#endif

2. 单例类的实现  

.h文件

#import "Singleton.h"

@interface LJSoundTool : NSObject

SingletonH(SoundTool);

@end

.m文件

#import "LJSoundTool.h"

@implementation LJSoundTool

SingletonM(SoundTool);

@end