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

以上这篇ios 单利的完整使用实例 及销毁 宏定义就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持。