字典转模型方法总结

第一步：将字典的元素转为实例变量，其中注意的是类型的不同；

代码如下：

 1 //
 2 //  HMQuestion.h
 3 //  01-超级猜图
 4 //
 5 //  Created by Administrator on 15/10/7.
 6 //  Copyright  2015年 ccsu. All rights reserved.
 7 //
 8
 9 #import <Foundation/Foundation.h>
10
11 @interface HMQuestion : NSObject
12 @property (nonatomic,copy) NSString *answer; //注意NSString类型的是copy
13 @property (nonatomic,copy) NSString *icon;
14 @property (nonatomic,copy) NSString *title;
15 @property (nonatomic,strong) NSArray *options;//NSArray类型的是strong
16
17 -(instancetype)initWithDict:(NSDictionary *)dict;
18 +(instancetype)questionWithDict:(NSDictionary *)dict;
19 /**返回所有题目数组*/
20 +(NSArray *)questions;
21 @end

第三步写类方法：（注意逻辑）

第四步字典转模型：（注意步骤）

 1 //
 2 //  HMQuestion.m
 3 //  01-超级猜图
 4 //
 5 //  Created by Administrator on 15/10/7.
 6 //  Copyright  2015年 ccsu. All rights reserved.
 7 //
 8
 9 #import "HMQuestion.h"
10
11 @implementation HMQuestion
12 -(instancetype)initWithDict:(NSDictionary *)dict{
13     self = [super init];
14     if (self) {
15         [self setValuesForKeysWithDictionary:dict];
16     }
17     return self;
18 }
19 +(instancetype)questionWithDict:(NSDictionary *)dict{
20
21     return [[self alloc]initWithDict:dict];
22 }
23
24
25 +(NSArray *)questions{
26     NSArray *array = [NSArray arrayWithContentsOfFile:[[NSBundle mainBundle]pathForResource:@"questions.plist" ofType:nil]];
27     NSMutableArray *arrayM = [NSMutableArray array];
28
29     for (NSDictionary *dic in array ) {
30         [arrayM addObject:[self questionWithDict:dic]];
31
32     }
33     return arrayM;
34 }

第五步：在主文件中引用文件创建实例对象，进行懒加载：

 1 //
 2 //  ViewController.m
 3 //  01-超级猜图
 4 //
 5 //  Created by Administrator on 15/10/6.
 6 //  Copyright  2015年 ccsu. All rights reserved.
 7 //
 8
 9 #import "ViewController.h"
10 #import "HMQuestion.h"
11
12 @interface ViewController ()
13 @property (weak, nonatomic) IBOutlet UIButton *iconButton;
14 @property(nonatomic,strong)UIButton *cover;
15 @property(nonatomic,strong)NSArray *questions;
16 @end
17
18 @implementation ViewController
19
20 -(NSArray *)questions
21 {
22     if (_questions == nil) {
23         _questions = [HMQuestion questions];
24     }
25     return _questions;
26
27 }

第六步 ：测试是否成功

1 -(void)viewDidLoad
2 {
3     [super viewDidLoad];
4     NSLog(@"%@",self.questions);
5    // for (HMQuestion *obj in self.questions) {
6    //   NSLog(@"%@",obj);
7    // }
8 }

测试优化：重写description方法（如果出现中文可能会出现乱码，所以需要引入NSArray+Log.h和NSArray+Log.m文件，直接添加就可以，不用头文件引用）：

1 -(NSString *)description
2 {
3     return [NSString stringWithFormat:@" <%@: %p>{answer:%@,icon:%@,title:%@, options:%@}",                self.class,self,self.answer,self.icon,self.title,self.options];
4
5
6 }

在viewDidLoad中优化如下：

1 -(void)viewDidLoad
2 {
3     [super viewDidLoad];
4     //NSLog(@"%@",self.questions);
5     for (HMQuestion *obj in self.questions) {
6         NSLog(@"%@",obj);
7     }
8 }

附加：NSArray+Log.h和NSArray+Log.m文件：

 1 //
 2 //  NSArray+Log.h
 3 //  应用程序管理
 4 //
 5 //  Created by 刘凡 on 14/8/14.
 6 //  Copyright (c) 2014年 itcast. All rights reserved.
 7 //
 8
 9 #import <Foundation/Foundation.h>
10
11 @interface NSArray (Log)
12
13 @end

 1 //
 2 //  NSArray+Log.m
 3 //  应用程序管理
 4 //
 5 //  Created by 刘凡 on 14/8/14.
 6 //  Copyright (c) 2014年 itcast. All rights reserved.
 7 //
 8
 9 #import "NSArray+Log.h"
10
11 @implementation NSArray (Log)
12
13 - (NSString *)descriptionWithLocale:(id)locale
14 {
15     NSMutableString *strM = [NSMutableString stringWithString:@"(\n"];
16
17     for (id obj in self) {
18         [strM appendFormat:@"\t%@,\n", obj];
19     }
20
21     [strM appendString:@")\n"];
22
23     return strM;
24 }
25
26 @end