[置顶] AFNetworking 2.0 新特性讲解之AFHTTPSessionManager

AFNetworking 2.0 相比1.0 API 接口改动还是很大的. 其中一个便是 AFURLSessionManager,当然如果你不太熟悉,或者为了兼容低版本,你依然可以选择AFHTTPRequestOperationManager,AFURLSessionManager是基于

NSURLSessionConfiguration(IOS 7.0+, MAC OX_9+)的.

下面我们借用TuneStore的API 来完成AFURLSessionManager的讲解.

如果您在看这边文章之前我建议您首先阅读下AFNetworking2.0的官方新特性介绍.

AFNetworking 2.0 Migration Guide - 你如果之前用过AF1.0 这个是很有必要来看的.
AFNetworking 2.0 Docs
AFNetworking 2.0 Source

另外T*witer 上说NSHipster的AFNetworking现在翻译成中文了,所以我搬过来了有兴趣的朋友也可以去看下,https://github.com/NSHipster/articles/blob/zh-Hans/2013-09-16-afnetworking-2.md

1:创建 client search iTunes

#import "AFHTTPSessionManager.h"@interfaceITunesClient:AFHTTPSessionManager+(ITunesClient*)sharedClient;-(NSURLSessionDataTask*)searchForTerm:(NSString*)term completion:(void(^)(NSArray*results,NSError*error))completion;@end

#import "ITunesClient.h"@implementationITunesClient+(ITunesClient*)sharedClient {staticITunesClient*_sharedClient =nil;staticdispatch_once_t onceToken;

    dispatch_once(&onceToken,^{

        NSURL *baseURL =[NSURL URLWithString:@"https://itunes.apple.com/"];NSURLSessionConfiguration*config =[NSURLSessionConfiguration defaultSessionConfiguration];[config setHTTPAdditionalHeaders:@{@"User-Agent":@"TuneStore iOS 1.0"}];

//设置我们的缓存大小其中内存缓存大小设置10M 磁盘缓存5M

NSURLCache*cache =[[NSURLCache alloc] initWithMemoryCapacity:10*1024*1024

                                                          diskCapacity:50*1024*1024

                                                              diskPath:nil];[config setURLCache:cache];

        _sharedClient =[[ITunesClient alloc] initWithBaseURL:baseURL

                                         sessionConfiguration:config];

        _sharedClient.responseSerializer =[AFJSONResponseSerializer serializer];});return _sharedClient;}-(NSURLSessionDataTask*)searchForTerm:(NSString*)term completion:(void(^)(NSArray*results,NSError*error))completion {NSURLSessionDataTask*task =[self GET:@"/search"

//为了速度我们将地区设置为台湾

                                parameters:@{@"country":@"TW",@"term": term }

                                   success:^(NSURLSessionDataTask*task, id responseObject){NSHTTPURLResponse*httpResponse =(NSHTTPURLResponse*)task.response;if(httpResponse.statusCode ==200){

                                           dispatch_async(dispatch_get_main_queue(),^{

                                               completion(responseObject[@"results"],nil);});}else{

                                           dispatch_async(dispatch_get_main_queue(),^{

                                               completion(nil,nil);});NSLog(@"Received: %@", responseObject);NSLog(@"Received HTTP %d", httpResponse.statusCode);}} failure:^(NSURLSessionDataTask*task,NSError*error){

                                       dispatch_async(dispatch_get_main_queue(),^{

                                           completion(nil, error);});}];return task;}@end

Note:为了便于对这个任务进行(取消,监控等)操作我们将这个任务返回.

2: 在view controller对client进行回调

NSURLSessionDataTask*task =[[ITunesClient sharedClient] searchForTerm:term

                                                                 completion:^(NSArray*results,NSError*error){if(results){self.results = results;[self.tableView reloadData];}else{NSLog(@"ERROR: %@", error);}}];

3: AFNetworking UIKit 之加载网络图片

每一个cell 我们可以利用 AFNetworking对UIImageView的 category .只需要在文件中导入 #import "UIImageView+AFNetworking.h" ,然后 cellForRowAtIndexPath:方法下直接使用即可

    cell.artworkImageView.image =nil;[cell.artworkImageView cancelImageRequestOperation];

    NSURL *imageURL =[NSURL URLWithString:record[@"artworkUrl100"]];if(imageURL){[cell.artworkImageView setImageWithURL:imageURL];}

4:当任务运行时显示 activity indicator

导入 #import "UIActivityIndicatorView+AFNetworking.h"

[self.activityIndicator setAnimatingWithStateOfTask:task];

运行效果如下

demo 下载地址