今天在学习一个用MVVM模式写的项目,掌握一下对MVVM的理解和记的一些笔记.
下面是自己学习的项目链接:
http://www.code4app.com/ios/一个MVVM架构的iOS工程/695f5862-f1d5-11e5-af82-00163e0606f4
1.
一个MVVM架构的iOS工程 :
Model层是少不了的了，我们得有东西充当DTO(数据传输对象)，当然，用字典也是可以的，Model层是比较薄的一层；
ViewModel层，就是View和Model层的粘合剂，他是一个放置用户输入验证逻辑，视图显示逻辑，发起网络请求和其他各种各样的代码的极好的地方。说白了，就是把原来ViewController层的业务逻辑和页面逻辑等剥离出来放到ViewModel层。
View层，就是ViewController层，他的任务就是从ViewModel层获取数据，然后显示。
2.
1>
自定义Model类:
@interface PublicModel : NSObject
@property (strong, nonatomic) NSString *userId;
@property (strong, nonatomic) NSString *weiboId;
@property (strong, nonatomic) NSString *userName;
@property (strong, nonatomic) NSURL *imageUrl;
@property (strong, nonatomic) NSString *date;
@property (strong, nonatomic) NSString *text;
@end
ViewModel部分:
1>自定义Model1类,接收数据:
1 #pragma 接收穿过来的block
2 -(void) setBlockWithReturnBlock: (ReturnValueBlock) returnBlock
3 WithErrorBlock: (ErrorCodeBlock) errorBlock
4 WithFailureBlock: (FailureBlock) failureBlock
5 {
6 _returnBlock = returnBlock;
7 _errorBlock = errorBlock;
8 _failureBlock = failureBlock;
9 }
2>再定义Model2类,继承自Model1类:
进行网络请求,对请求下来的数据进行数据处理,处理跳转到详情页面.
1 @implementation PublicWeiboViewModel
2
3 //获取公共微博
4 -(void) fetchPublicWeiBo
5 {
6 NSDictionary *parameter = @{TOKEN: ACCESSTOKEN,
7 COUNT: @"100"
8 };
9 [NetRequestClass NetRequestGETWithRequestURL:REQUESTPUBLICURL WithParameter:parameter WithReturnValeuBlock:^(id returnValue) {
10
11 DDLog(@"%@", returnValue);
12 [self fetchValueSuccessWithDic:returnValue];
13
14 } WithErrorCodeBlock:^(id errorCode) {
15 DDLog(@"%@", errorCode);
16 [self errorCodeWithDic:errorCode];
17
18 } WithFailureBlock:^{
19 [self netFailure];
20 DDLog(@"网络异常");
21
22 }];
23
24 }
25
26
27
28 #pragma 获取到正确的数据，对正确的数据进行处理
29 -(void)fetchValueSuccessWithDic: (NSDictionary *) returnValue
30 {
31 //对从后台获取的数据进行处理，然后传给ViewController层进行显示
32
33 NSArray *statuses = returnValue[STATUSES];
34 NSMutableArray *publicModelArray = [[NSMutableArray alloc] initWithCapacity:statuses.count];
35
36 for (int i = 0; i < statuses.count; i ++) {
37 PublicModel *publicModel = [[PublicModel alloc] init];
38
39 //设置时间
40 NSDateFormatter *iosDateFormater=[[NSDateFormatter alloc]init];
41 iosDateFormater.dateFormat=@"EEE MMM d HH:mm:ss Z yyyy";
42
43 //必须设置，否则无法解析
44 iosDateFormater.locale=[[NSLocale alloc]initWithLocaleIdentifier:@"en_US"];
45 NSDate *date=[iosDateFormater dateFromString:statuses[i][CREATETIME]];
46
47 //目的格式
48 NSDateFormatter *resultFormatter=[[NSDateFormatter alloc]init];
49 [resultFormatter setDateFormat:@"MM月dd日 HH:mm"];
50
51 publicModel.date = [resultFormatter stringFromDate:date];
52 publicModel.userName = statuses[i][USER][USERNAME];
53 publicModel.text = statuses[i][WEIBOTEXT];
54 publicModel.imageUrl = [NSURL URLWithString:statuses[i][USER][HEADIMAGEURL]];
55 publicModel.userId = statuses[i][USER][UID];
56 publicModel.weiboId = statuses[i][WEIBOID];
57
58 [publicModelArray addObject:publicModel];
59
60 }
61
62 self.returnBlock(publicModelArray);
63 }
64
65 #pragma 对ErrorCode进行处理
66 -(void) errorCodeWithDic: (NSDictionary *) errorDic
67 {
68 self.errorBlock(errorDic);
69 }
70
71 #pragma 对网路异常进行处理
72 -(void) netFailure
73 {
74 self.failureBlock();
75 }
76
77
78 #pragma 跳转到详情页面，如需网路请求的，可在此方法中添加相应的网络请求
79 -(void) weiboDetailWithPublicModel: (PublicModel *) publicModel WithViewController:(UIViewController *)superController
80 {
81 DDLog(@"%@,%@,%@",publicModel.userId,publicModel.weiboId,publicModel.text);
82 UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"Main" bundle:[NSBundle mainBundle]];
83 PublicDetailViewController *detailController = [storyboard instantiateViewControllerWithIdentifier:@"PublicDetailViewController"];
84 detailController.publicModel = publicModel;
85 [superController.navigationController pushViewController:detailController animated:YES];
86
87 }
88
89
90 @end
3.Controller部分:
接收model数据,定义表视图,实现其协议方法.
1 @implementation PublicTableViewController
2
3 - (void)viewDidLoad {
4 [super viewDidLoad];
5
6
7 // 接收数据
8
9 PublicWeiboViewModel *publicViewModel = [[PublicWeiboViewModel alloc] init];
10
11 [publicViewModel setBlockWithReturnBlock:^(id returnValue) {
12
13 [SVProgressHUD dismiss];
14 _publicModelArray = returnValue;
15 [self.tableView reloadData];
16 DDLog(@"%@",_publicModelArray);
17
18 } WithErrorBlock:^(id errorCode) {
19
20 [SVProgressHUD dismiss];
21
22 } WithFailureBlock:^{
23
24 [SVProgressHUD dismiss];
25
26 }];
27
28 [publicViewModel fetchPublicWeiBo];
29
30 [SVProgressHUD showWithStatus:@"正在获取用户信息……" maskType:SVProgressHUDMaskTypeBlack];
31
32 }
33
34 - (void)didReceiveMemoryWarning {
35 [super didReceiveMemoryWarning];
36 // Dispose of any resources that can be recreated.
37 }
38
39 #pragma mark - Table view data source
40
41 - (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
42 return 1;
43 }
44
45 - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
46
47 return _publicModelArray.count;
48 }
49
50
51 - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
52 PublicCell *cell = [tableView dequeueReusableCellWithIdentifier:@"PublicCell" forIndexPath:indexPath];
53
54 [cell setValueWithDic:_publicModelArray[indexPath.row]];
55
56 return cell;
57 }
58
59 -(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
60 {
61 PublicWeiboViewModel *publicViewModel = [[PublicWeiboViewModel alloc] init];
62 [publicViewModel weiboDetailWithPublicModel:_publicModelArray[indexPath.row] WithViewController:self];
63 }
总结:
1.其实际上MVVM和MVC设计模式大体上是一样的,只是把MVC在C中请求网络和处理数据信息的部分子类了在ViewModel中实现,减轻了C的负担和代码量;
2.Model的存储数据还是不变;
时间： 2024-10-10 21:03:40