你想一句话写单例吗？
想就跟我一起来看看吧!（把单例定义成宏）

用法如下：

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具体代码如下：

#define singletonInterface(classname)              +(instancetype)shared##classname;

#if __has_feature(objc_arc)

#define singletonImplemention(class) \
static id instanse;\
\
+ (instancetype)allocWithZone:(struct _NSZone *)zone\
{\
    static dispatch_once_t onesToken;\
    dispatch_once(&onesToken, ^{\
        instanse = [super allocWithZone:zone];\
    });\
    return instanse;\
}\
\
+ (instancetype)shared##class\
{\
    static dispatch_once_t onestoken;\
    dispatch_once(&onestoken, ^{\
        instanse = [[self alloc] init];\
    });\
    return instanse;\
}\
\
- (id)copyWithZone:(NSZone *)zone\
{\
    return instanse;\
};
#else

#define singletonImplemention(class)  \
static id instanse;\
\
+ (instancetype)allocWithZone:(struct _NSZone *)zone\
{\
    static dispatch_once_t onesToken;\
    dispatch_once(&onesToken, ^{\
    instanse = [super allocWithZone:zone];\
        });\
    return instanse;\
}\
\
+ (instancetype)shared##class\
{\
    static dispatch_once_t onestoken;\
    dispatch_once(&onestoken, ^{\
    instanse = [[self alloc] init];\
    });\
    return instanse;\
}\
\
- (id)copyWithZone:(NSZone *)zone\
{\
    return instanse;\
}\
\
- (oneway void)release {} \
- (instancetype)retain {return instance;} \
- (instancetype)autorelease {return instance;} \
- (NSUInteger)retainCount {return ULONG_MAX;}

#endif

另附代码下载地址：
http://pan.baidu.com/s/1jGItvgi