iOS key value coding kvc在接收json数据与 model封装中的使用

iOS key value coding  kvc在接收json数据与 model封装中的使用

使用 kvc 能够极大的简化代码工作，及以后的接口维护工作；

1：先创建MovieModel类.h和 .m

    注意Model类的属性根据 后台接口返回的 json数据 里面的字段对应，一一对应；

//  Created by cocoajin on 14-1-15.
//  Copyright (c) 2014年 www.zhgu.net. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface MovieModel : NSObject

@property (nonatomic,strong)NSString *alt;
@property (nonatomic,strong)NSNumber *collect_count;
@property (nonatomic,strong)NSString *original_title;
@property (nonatomic,strong)NSString *title;
@property (nonatomic,strong)NSNumber *year;
@property (nonatomic,strong)NSString *subtype;
@property (nonatomic,strong)NSNumber *id;
@property (nonatomic,strong)NSDictionary *images;
@property (nonatomic,strong)NSDictionary *rating;

- (id)initWith:(NSDictionary *)aDic;


@end

#import "MovieModel.h"

@implementation MovieModel

- (id)initWith:(NSDictionary *)aDic
{
    self = [super init];
    
    if (self) {
        [self setValuesForKeysWithDictionary:aDic];
    }
    
    return self;
}



- (void)setValue:(id)value forUndefinedKey:(NSString *)key
{
    NSLog(@"未定义的key:%@",key);
}

- (NSString *)description
{
    return [NSString stringWithFormat:@"thie movie is :alt=%@ ,collect_count=%@ ,original_title=%@ ,title=%@ ,year=%@ ,subtype=%@, id=%@ ,image=%@ ,rating=%@",self.alt,self.collect_count,self.original_title,self.title,self.year,self.subtype,self.id,self.images,self.rating];
}

2：接口请求处理部分：

    NSString *douBanApi = @"http://api.douban.com/v2/movie/top250?count=5";
    ASIHTTPRequest *request = [ASIHTTPRequest requestWithURL:[NSURL URLWithString:douBanApi]];
    
    __block ASIHTTPRequest *brRequest = request;
    
    [request setCompletionBlock:^{
        id json = [NSJSONSerialization JSONObjectWithData:[brRequest responseData] options:0 error:Nil];
        //NSLog(@"%@",json);
        NSLog(@"completed");
        
        NSDictionary *dataDic = [NSDictionary dictionaryWithDictionary:[[json objectForKey:@"subjects"] objectAtIndex:0]];
        NSLog(@"dataDic = %@",dataDic);
        
        MovieModel *movie = [[MovieModel alloc]initWith:dataDic];
        NSLog(@"%@",movie);
        
    }];
    
    [request setFailedBlock:^{
        NSLog(@"%@",[brRequest error]);
    }];
    
    [request startAsynchronous];

3：请求处理的log结果