如下所示：
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
//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;\
}\
|
|
1
2
3
4
5
6
7
8
|
//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
|
|
1
2
3
4
5
|
#import "YNHTUserModel.h"
@implementation YNHTUserModel
SYNTHESIZE_SINGLETON_FOR_CLASS(YNHTUserModel);
@end
|
以上这篇ios 单例的完整使用实例 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服务器之家。
原文链接：http://blog.csdn.net/qq_20035785/article/details/78958989