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,在载入图片),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]; }
当中 :
[self.imageViewsetImageWithURL:_post.user.avatarImageURLplaceholderImage:[UIImageimageNamed:@"profile-image-placeholder"]];
这句代码是对UIImageView的扩展,在UIKit+AFNetworking能够直接使用,很方便。
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