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 YNHTUserModelSYNTHESIZE_SINGLETON_FOR_CLASS(YNHTUserModel);@end

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