首先新建一个头文件,定义如下宏:
|
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
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
|
// .h文件的实现#define SingletonH(methodName) + (instancetype)shared##methodName;// .m文件的实现#if __has_feature(objc_arc) // 是ARC#define SingletonM(methodName) \static id _instace = nil; \
+ (id)allocWithZone:(struct _NSZone *)zone \
{ \if (_instace == nil) { \
static dispatch_once_t onceToken; \
dispatch_once(&onceToken, ^{ \_instace = [super allocWithZone:zone]; \
}); \} \return _instace; \
} \\- (id)init \
{ \static dispatch_once_t onceToken; \
dispatch_once(&onceToken, ^{ \_instace = [super init]; \
}); \return _instace; \
} \\+ (instancetype)shared##methodName \{ \return [[self alloc] init]; \
} \+ (id)copyWithZone:(struct _NSZone *)zone \
{ \return _instace; \
} \\+ (id)mutableCopyWithZone:(struct _NSZone *)zone \
{ \return _instace; \
}#else // 不是ARC#define SingletonM(methodName) \static id _instace = nil; \
+ (id)allocWithZone:(struct _NSZone *)zone \
{ \if (_instace == nil) { \
static dispatch_once_t onceToken; \
dispatch_once(&onceToken, ^{ \_instace = [super allocWithZone:zone]; \
}); \} \return _instace; \
} \\- (id)init \
{ \static dispatch_once_t onceToken; \
dispatch_once(&onceToken, ^{ \_instace = [super init]; \
}); \return _instace; \
} \\+ (instancetype)shared##methodName \{ \return [[self alloc] init]; \
} \\- (oneway void)release \
{ \\} \\- (id)retain \
{ \return self; \
} \\- (NSUInteger)retainCount \
{ \return 1; \
} \+ (id)copyWithZone:(struct _NSZone *)zone \
{ \ return _instace; \
} \ \
+ (id)mutableCopyWithZone:(struct _NSZone *)zone \
{ \ return _instace; \
}#endif |
然后在你定义单例类的
.h 文件 写 SingletonH(MyMethodName)
.m 文件写 SingletonM(MyMethodName)
搞定!