iOS单例宏

//
//  Single.h
//  FKLTest
//
//  Created by kun on 16/8/11.
//  Copyright © 2016年 kun. All rights reserved.
//

#ifndef Single_h
#define Single_h

#define SingelH(name) +(instancetype)share##name;

#if __has_feature(objc_arc) // 条件编译 ARC
#define SingelM(name) static id share##name = nil;
+ (instancetype)allocWithZone:(struct _NSZone *)zone
{
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
if ( !share##name )
{
share##name = [super allocWithZone:zone];
}
});
return share##name;
}
+ (instancetype)share##name
{
return [[self alloc] init];
}
- (id)copyWithZone:(NSZone *)zone
{
return share##name;
}
- (id)mutableCopyWithZone:(NSZone *)zone
{
return share##name;
}
#else // 条件编译 MRC
#define SingelM(name) static id share##name = nil;
+ (instancetype)allocWithZone:(struct _NSZone *)zone
{
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
if ( !share##name )
{
share##name = [super allocWithZone:zone];
}
});
return share##name;
}
+ (instancetype)share##name
{
return [[self alloc] init];
}
- (id)copyWithZone:(NSZone *)zone
{
return share##name;
}
- (id)mutableCopyWithZone:(NSZone *)zone
{
return share##name;
}
- (oneway void)release
{
}
- (instancetype)retain
{
    return shared##name;
}
- (NSUInteger)retainCount
{
    return MAXFLOAT;
}
#endif // 条件编译

#endif /* Single_h */