结构体的封装、单例模式代码

//对象方法封装结构体
 1 #import <Foundation/Foundation.h>
 2 typedef struct
 3 {
 4     char *name;
 5     int age;
 6 }Student;
 7 
 8 @interface CZValue : NSObject
 9 @property (nonatomic,assign)Student stu;
10 - (instancetype)valueWithStudent:(Student)stu;
11 @end
12 
13 
14 
15 
16 
17 
18 
19 #import "CZValue.h"
20 
21 @implementation CZValue
22 
23 - (instancetype)valueWithStudent:(Student)stu
24 {
25     id val = [self.class new];
26     [val  setStu:stu];
27     return val;
28 }
29 @end

//类方法创建结构体
 1 #import <Foundation/Foundation.h>
 2 
 3 struct Studnet
 4 {
 5     char *name;
 6     int age;
 7     char *stuNumber;
 8 };
 9 @interface CZValue : NSObject
10 
11 @property(nonatomic,assign)struct Studnet stu;
12 
13 + (instancetype)valueWithStudent:(struct Studnet)stu;
14 @end
15 
16 
17 
18 #import "CZValue.h"
19 
20 @implementation CZValue
21 
22 + (instancetype)valueWithStudent:(struct Studnet)stu
23 {
24     id v1 = [self new];
25     [v1 setStu:stu];
26     return v1;
27 }
28 @end

 1 2.单例模式代码
 2 
 3 // 
 4 //  Person.h
 5 
 6 #import <Foundation/Foundation.h>
 7 
 8 @interface Person : NSObject
 9 
10 @property(nonatomic,copy)NSString *name;
11 @property(nonatomic,assign)int age;
12 
13 
14 + (instancetype)sharedPerson;
15 
16 @end
17 
18 
19 
20 + (instancetype)sharedPerson
21 {
22     return [[self alloc] init];//alloc 实际调用 allocWithZone
23 }
24 
25 @end
26 
27 
28 手写情况：
29 //typedef struct _NSZone NSZone;//苹果自定义的
30 //1._NSZone,后3个字母小写。2.是类方法，不是对象方法
31 + (instancetype)allocWithZone:(struct _NSZone * )zone
32 {
33     static id instance = nil;
34     if (nil == instance)
35     {
36         instance = [super allocWithZone:zone];
37         
38     }
39     
40     return instance;
41 }
42 
43 + (instancetype)sharedPerson
44 {
45     return [[self alloc] init];//3.[ 位置也错了！
46 }
47 
48 @end//4.位置居然放错了     5。没有在.h中声明