ios 单利的完整使用实例 及销毁 宏定义

如下所示：

//下面这段宏考过去直接用
#define synthesize_singleton_for_header(classname) \
\
+ (classname *)sharedinstance;\
+ (void)destroyinstance;
//在单例生成之前oncetoken = 0,在单例生成之后oncetoken = -1了,之后一直保持-1这个值,知道这个之后我想你应该有思路了
#define synthesize_singleton_for_class(classname) \
\
static classname *shared##classname = nil; \
static dispatch_once_t oncetoken;\
+ (classname *)sharedinstance\
{\
 return [[self alloc] init];\
}\
+ (classname *)allocwithzone:(struct _nszone *)zone\
{\
 dispatch_once(&oncetoken, ^{\
  shared##classname = [super allocwithzone:zone];\
 });\
 return shared##classname;\
}\
- (classname *)copywithzone:(nszone *)zone\
{\
 return shared##classname;\
}\
- (classname *)mutablecopywithzone:(nszone *)zone\
{\
 return shared##classname;\
}\
+ (void)destroyinstance {\
 shared##classname = nil;\
 oncetoken = 0;\
}\

//用法，注意要遵循nscopying,nsmutablecopying 协议
import <foundation/foundation.h>
@interface ynhtusermodel : nsobject<nscopying,nsmutablecopying>
synthesize_singleton_for_header(ynhtusermodel);
@property (nonatomic,copy) nsstring* inviter_id;//邀请人id
@property (nonatomic,copy) nsstring* token;
@property (nonatomic,copy) nsstring* nick_name;
@end

#import "ynhtusermodel.h"
@implementation ynhtusermodel
synthesize_singleton_for_class(ynhtusermodel);

@end

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