BaseModel

#import <Foundation/Foundation.h>

@interface BaseModel : NSObject

- (id)initContentWithDic:(NSDictionary *)jsonDic;

- (void)setAttributes:(NSDictionary *)jsonDic;

- (NSDictionary *)attributeMapDictionary:(NSDictionary *)jsonDic;

@end

#import "BaseModel.h"

@implementation BaseModel

- (id)initContentWithDic:(NSDictionary *)jsonDic

{

    self = [super init];

    if (self != nil) {

        [self setAttributes:jsonDic];

    }

    

    return self;

}

- (void)setAttributes:(NSDictionary *)jsonDic

{

    

    /*

     key:  json字典的key名

     value: model对象的属性名

     */

    //mapDic： 属性名与json字典的key 的映射关系

    NSDictionary *mapDic = [self attributeMapDictionary:jsonDic];

    

    for (NSString *jsonKey in mapDic) {

        

        //modelAttr:"newsId"

        //jsonKey : "id" 

        NSString *modelAttr = [mapDic objectForKey:jsonKey];

        SEL seletor = [self stringToSel:modelAttr];

        

        //判断self 是否有seletor 方法

        if ([self respondsToSelector:seletor]) {

            //json字典中的value

            id value = [jsonDic objectForKey:jsonKey];

            

            if ([value isKindOfClass:[NSNull class]]) {

                value = @"";

            }

            

            //调用属性的设置器方法，参数是json的value

            [self performSelector:seletor withObject:value];

        }

        

    }

}

/*

  SEL 类型的创建方式有两种，例如：setNewsId: 的SEL类型

  1.第一种

   SEL selector = @selector(setNewsId:)

  2.第二种

   SEL selector = NSSelectorFromString(@"setNewsId:");

 */

//将属性名转成SEL类型的set方法

//newsId  --> setNewsId:

- (SEL)stringToSel:(NSString *)attName

{

    

    //attName: image

    

    

    //截取收字母

    NSString *first = [[attName substringToIndex:1] uppercaseString]; //I

    NSString *end = [attName substringFromIndex:1];//mage

    

    NSString *setMethod = [NSString stringWithFormat:@"set%@%@:",first,end];

    //setImage:

    

    //将字符串转成SEL类型

    return NSSelectorFromString(setMethod);

}

/*

  属性名与json字典中key的映射关系

    key:  json字典的key名

    value: model对象的属性名

 */

- (NSDictionary *)attributeMapDictionary:(NSDictionary *)jsonDic

{

    

    NSMutableDictionary *mapDic = [NSMutableDictionary dictionary];

    

    for (id key in jsonDic) {

        [mapDic setObject:key forKey:key];

    }

    

    /*

     {

        id: @"id"

        image: @"image"

        type: @"type"

     }

     */

    return mapDic;

}

@end