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解读AFNetworking中Demo的MVC

Demo的下载地址:AFNetworking下载

打开Demo:

现实的功能,就是一个简易的微博timeline界面:

项目预览:

用到的第三方:AFNetworking 和 UIKit+AFNetworking

功能:用户图像(先显示默认图,在加载图片),用户发的内容,下拉刷新。

C层:

发一个请求:(告诉M 要做什么)

- (void)reload:(__unusedid)sender {
    self.navigationItem.rightBarButtonItem.enabled = NO;

    NSURLSessionTask *task = [PostglobalTimelinePostsWithBlock:^(NSArray *posts, NSError *error) {
        if (!error) {

             self.posts = posts;
            [self.tableViewreloadData];
        }
    }];

    [UIAlertViewshowAlertViewForTaskWithErrorOnCompletion:task delegate:nil];
    [self.refreshControlsetRefreshingWithStateOfTask:task];
}

M 做完之手,产生多个post对象,放到self.post数组里面。C拿到M给的post对象,去更新V

cell.post = [self.postsobjectAtIndex:(NSUInteger)indexPath.row];

M层:

M 收到C的请求:去请求数据,解析,转换成post对象,然后通过block返回给C

+ (NSURLSessionDataTask *)globalTimelinePostsWithBlock:(void (^)(NSArray *posts, NSError *error))block {
    return [[AFAppDotNetAPIClientsharedClient] GET:@"stream/0/posts/stream/global"parameters:nilsuccess:^(NSURLSessionDataTask * __unused task, id JSON) {
        NSArray *postsFromResponse = [JSON valueForKeyPath:@"data"];
        NSMutableArray *mutablePosts = [NSMutableArrayarrayWithCapacity:[postsFromResponse count]];
        for (NSDictionary *attributes in postsFromResponse) {
            Post *post = [[Postalloc] initWithAttributes:attributes];
            [mutablePosts addObject:post];
        }

        if (block) {
            block([NSArrayarrayWithArray:mutablePosts], nil);
        }
    } failure:^(NSURLSessionDataTask *__unused task, NSError *error) {
        if (block) {
            block([NSArrayarray], error);
        }
    }];
}

V层:

V:拿到C给的数据,来展示出来,这一步就是更新UI

- (void)setPost:(Post *)post {
    _post = post;

    self.textLabel.text = _post.user.username;
    self.detailTextLabel.text = _post.text;
    [self.imageViewsetImageWithURL:_post.user.avatarImageURLplaceholderImage:[UIImageimageNamed:@"profile-image-placeholder"]];

    [selfsetNeedsLayout];
}

其中 :

    [self.imageViewsetImageWithURL:_post.user.avatarImageURLplaceholderImage:[UIImageimageNamed:@"profile-image-placeholder"]];

这句代码是对UIImageView的扩展,在UIKit+AFNetworking可以直接使用,非常方便。

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