把单例设成宏定义

#undef  AS_SINGLETON#define AS_SINGLETON( __class ) \- (__class *)sharedInstance; \+ (__class *)sharedInstance;#undef  DEF_SINGLETON#define DEF_SINGLETON( __class ) \- (__class *)sharedInstance \{ \    return [__class sharedInstance]; \} \+ (__class *)sharedInstance \{ \    static dispatch_once_t once; \    static __class * __singleton__; \    dispatch_once( &once, ^{ __singleton__ = [[[self class] alloc] init]; } ); \    return __singleton__; \}#undef  DEF_SINGLETON_AUTOLOAD#define DEF_SINGLETON_AUTOLOAD( __class ) \- (__class *)sharedInstance \{ \    return [__class sharedInstance]; \} \+ (__class *)sharedInstance \{ \    static dispatch_once_t once; \    static __class * __singleton__; \    dispatch_once( &once, ^{ __singleton__ = [[[self class] alloc] init]; } ); \    return __singleton__; \} \+ (void)load \{ \    [self sharedInstance]; \}#import@interface Danli_yinhangkaMsg : NSObject

.h

.m

#import "Danli_yinhangkaMsg.h"

@implementation Danli_yinhangkaMsg

DEF_SINGLETON(Danli_yinhangkaMsg)

-(NSMutableArray *)data_array_YHK

{

//判断是否已经有了，若没有，则进行实例化

if (!_data_array_YHK) {

_data_array_YHK=[[NSMutableArray alloc]init];

}

return _data_array_YHK;

}

@end

http://blog.csdn.net/chaoyuan899/article/details/17524575