IOS项目之分层MVVM

在做.Net时,有用到三层架构,使项目分层。ios项目使用AFNetWork把网络层这块也放进了ViewController中,数据解析缓存这些也在里面，这样层次结构可能不够清楚,今天就试着分离了一下。

1.类结构

首页主要有三个部分组成,顶部的广告,中部的图标,和下部的一些单元格。设计了三个类,AdModel、IconModel、HomeFeedModel,参考MVVM同时设计了一个ViewModel,声明了服务电话以及三个存储上面类对象的数组。原以为将前面的三个类实现NSCoding协议就可以了没想到ViewModel也要实现。

2.AFNetWorking分离

(1)遇到的问题

想着写一个方法可以获取请求数据的同时也能把错误信息返回出来所以开始就写了下面的代码, 运行发现msg、errmsg都是空,断点之后发现AFNetWork请求部分是异步的,return之前还没有给msg赋值,让我很是纠结, 这样就没有返回值。另block中修改外部变量要加__block

(2)解决

由于上面出现的问题，两个类的传值还是有问题,属于有多个返回值，问了下小伙伴,说结构有问题，需要用代理或者block，于是我又加了一个block，这下试了是可以的 @Class前置声明

#import <Foundation/Foundation.h>
@class HomeModel;
typedef void(^homeModelBlock) (HomeModel *model,NSString *errmsg);
@interface HomeModel : NSObject
@property(nonatomic,strong) NSString *telPhone;
@property(nonatomic,strong) NSMutableArray *adList;
@property(nonatomic,strong) NSMutableArray *iconList;
@property(nonatomic,strong) NSMutableArray *homeFeedList;
@property(nonatomic,copy)  homeModelBlock homeBlock;

-(void)GetHomeData;

@end

//
//  HomeModel.m
//  XQB
//
//  Created by City--Online on 15/6/24.
//
//

#import "HomeModel.h"
#import "AdModel.h"
#import "IconModel.h"
#import "HomeFeed.h"
#import "Global.h"

@implementation HomeModel

//NSCoding协议
-(void)encodeWithCoder:(NSCoder *)aCoder
{
    [aCoder encodeObject:self.telPhone forKey:@"telPhone"];
    [aCoder encodeObject:self.adList forKey:@"adList"];
    [aCoder encodeObject:self.iconList forKey:@"iconList"];
    [aCoder encodeObject:self.homeFeedList forKey:@"homeFeedList"];
}
- (instancetype)initWithCoder:(NSCoder *)coder
{
    self = [super init];
    if (self) {
        _telPhone=[coder decodeObjectForKey:@"telPhone"];
        _adList=[coder decodeObjectForKey:@"adList"];
        _iconList=[coder decodeObjectForKey:@"iconList"];
        _homeFeedList=[coder decodeObjectForKey:@"homeFeedList"];
    }
    return self;
}

- (instancetype)init
{
    self = [super init];
    if (self) {
        self.adList=[[NSMutableArray alloc]init];
        self.iconList=[[NSMutableArray alloc]init];
        self.homeFeedList=[[NSMutableArray alloc]init];
    }
    return self;
}
//网络请求获取数据
-(void)GetHomeData
{
    __block HomeModel *homeModel=[[HomeModel alloc]init];
    __block NSString *msg=[[NSString alloc]init];
    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager shareManager];
    NSMutableDictionary *parameters = [[NSMutableDictionary alloc] initWithDictionary:[CommonParameters getCommonParameters]];
    [parameters addSignatureKey];
    [manager GET:API_HOME_URL parameters:parameters success:^(AFHTTPRequestOperation *operation, id responseObject) {
        //        XQBLog(@"\nresponseObject:%@", responseObject);
        if ([[responseObject objectForKey:XQB_NETWORK_ERROR_CODE] isEqualToString:XQB_NETWORK_ERROR_CODE_OK]) {
            NSMutableDictionary *dataDic = [responseObject objectForKey:@"data"];
            homeModel= [self transData:dataDic];
            msg=@"chenggong";
            _homeBlock(homeModel,nil);

        } else {
            //加载服务器异常界面
            homeModel=[self unArchiverData];
            msg=@"服务器异常";
            _homeBlock(homeModel,msg);
        }
    }failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        //加载网络异常界面
        msg=@"网络异常";
        homeModel=[self unArchiverData];
        _homeBlock(homeModel,msg);
    }];
    return ;
}

-(HomeModel *)transData:(NSDictionary *)dic
{
    HomeModel *homeModel=[[HomeModel alloc]init];

    NSString *telPhone = DealWithJSONValue([dic objectForKey:@"telephone"]);
    homeModel.telPhone=telPhone;

     NSArray *adArray = [dic objectForKey:@"ads"];
    for (NSDictionary *adInfo in adArray) {
        AdModel *adModel = [[AdModel alloc] init];
        adModel.adId = [[adInfo objectForKey:@"adId"] stringValue];
        adModel.imageUrl = DealWithJSONValue([adInfo objectForKey:@"image"]);
        adModel.link = DealWithJSONValue([adInfo objectForKey:@"link"]);
        adModel.title = DealWithJSONValue([adInfo objectForKey:@"title"]);
        [homeModel.adList addObject:adModel];
    }

    NSArray *homeIcons = [dic objectForKey:@"homeIcons"];
    for (NSDictionary *homeIconDic in homeIcons) {
        IconModel *item = [[IconModel alloc] init];
        item.title = [homeIconDic objectForKey:@"title"];
        item.icon = [homeIconDic objectForKey:@"icon"];
        item.linkUrl = [homeIconDic objectForKey:@"linkUrl"];
        item.type = [homeIconDic objectForKey:@"type"];
        item.createId = [[homeIconDic objectForKey:@"createId"] stringValue];
        item.iconId = [[homeIconDic objectForKey:@"id"] stringValue];
        item.category = [homeIconDic objectForKey:@"category"];

        [homeModel.iconList addObject:item];

    }
    NSArray *feedsDic = [dic objectForKey:@"feeds"];
    for (NSDictionary *feedDic in feedsDic) {
        HomeFeed *model = [[HomeFeed alloc] init];
        model.feedId = [[feedDic objectForKey:@"feedId"] stringValue];
        model.feedType = [feedDic objectForKey:@"feedType"];
        model.title = DealWithJSONValue([feedDic objectForKey:@"title"]);
        model.icon = DealWithJSONValue([feedDic objectForKey:@"icon"]);
        model.content = DealWithJSONValue([feedDic objectForKey:@"content"]);
        model.feedCity = [feedDic objectForKey:@"feedCity"];
        model.linkType = [feedDic objectForKey:@"linkType"];
        [homeModel.homeFeedList addObject:model];
    }
    [self savefile:homeModel];
    return homeModel;
}

//解档
-(HomeModel *)unArchiverData
{
    NSMutableData *mutableData=[[NSMutableData alloc]initWithContentsOfFile:[self filePath]];
    NSKeyedUnarchiver *unarchiver=[[NSKeyedUnarchiver alloc]initForReadingWithData:mutableData];
    HomeModel *model=[unarchiver decodeObjectForKey:@"homeModel"];
//    NSLog(@"%@   %@",model.telPhone,model.adList);
//    for (IconModel *admodel in model.iconList) {
//        NSLog(@"%@",admodel.title);
//    }
    return model;
}
//归档
-(void)savefile:(HomeModel *)model
{

    NSMutableData *mutableData=[[NSMutableData alloc]init];
    NSKeyedArchiver *archiver=[[NSKeyedArchiver alloc]initForWritingWithMutableData:mutableData];
    [archiver encodeObject:model forKey:@"homeModel"];
    [archiver finishEncoding];
    [mutableData writeToFile:[self filePath] atomically:YES];

}
//获取文件路径
-(NSString *)filePath
{
    NSArray *documents=NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentpath=[documents firstObject];
    NSString *filePath=[documentpath stringByAppendingPathComponent:@"home"];
    return filePath;
}
@end

这样就能实现网络和ViewController的分离了,再往下可以将业务逻辑和网络层再分离,项目不大,这里就没有细分