iOS 使用AFNetworking

標籤：字串   工程   監控   介面   網路   

一 下載： 網址 -- github

二 環境：

  需要引入的庫 - CoreLocation.framework

  SystemConfiguration.framework

  MobileCoreServices.framework

  Security.framework

  需要在 ARC 的環境下 - 非 ARC 的工程中 - 請添加 -fobjc-arc 

三 結構:

1 ： AFHTTPClient  --   提供了一個方便的網路互動介面，包括預設頭，身分識別驗證，是否串連到網路，批量處理操作，查詢字串參數序列化，已經多種表單請求

2 ： AFHTTPRequestOperation -- 

和它得子類可以基於http狀態和內容列下來區分是否成功請求了

3 ： AFURLConnectionOperation -- 

和它的子類繼承NSOperation的，允許請求被取消，暫停/恢複和由NSOperationQueue進行管理。

4 ： AFURLConnectionOperation -- 

可以讓你輕鬆得完成上傳和下載，處理驗證，監控上傳和下載進度，控制的緩衝。

四 使用 ：

用法情境 1 ： 請求api資料

方法1 --

建立一個 AFHTTPClient 執行個體

AFHTTPClient * client = [[AFHTTPClient alloc] initWithBaseURL:[NSURL URLWithString:@"http://api.jiepang.com"]];

// 這裡一定要有一個 baseURL - 不然會拋出一個異常 -- 

建立一個 NSURLRequest 執行個體

NSDictionary * params = @{@"apiver": @"4",@"id" : @"830755858",@"extra_info": @"1"};

    NSURLRequest * request = [client requestWithMethod:@"POST"

                                              path:@"users/show"

                                        parameters:params];

    @param  method 網路請求方式，比如 GET,POST,PUT,DELETE , 不能為 nil -- 

    @param  path   和 baseURL 組合成為一個 url  -- 通俗的說，就是我們調用的介面 -- 比如，我想調用http://api.jiepang.com/users/show，這個介面 -- 那麼 baseURL 為 http://api.jiepang.com -- path 為users/show 

    @param  parameters 網路請求參數 -- http://api.jiepang.com/v1/users/show?id=123 -- id=123 就是這個參數

建立一個 AFHTTPRequestOperation 執行個體進行網路連結

AFHTTPRequestOperation * operation = [client HTTPRequestOperationWithRequest:request success:^(AFHTTPRequestOperation *operation, id responseObject) {

        

        NSLog(@"success obj == %@",responseObject);

        

    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {

        

        NSLog(@"faild , error == %@ ", error);

    }];

    [operation start];

    這樣 - 一次簡單的調用就OK了 - 

    當然也可以，用封裝好的其它方法 -- 

    - (void)getPath:(NSString *)path

     parameters:(NSDictionary *)parameters

        success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success

        failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure;

    - (void)postPath:(NSString *)path

      parameters:(NSDictionary *)parameters

         success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success

         failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure;

    - (void)putPath:(NSString *)path

     parameters:(NSDictionary *)parameters

        success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success

        failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure;

    - (void)deletePath:(NSString *)path

        parameters:(NSDictionary *)parameters

           success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success

           failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure;

- (void)patchPath:(NSString *)path

parameters:(NSDictionary *)parameters

 success:(void (^)(AFHTTPRequestOperation *operation, id responseObject))success

 failure:(void (^)(AFHTTPRequestOperation *operation, NSError *error))failure;

省去了組裝 Resquest 的時間  --

比如 - 

方法二 --

    [client getPath:path

     parameters:params

        success:^(AFHTTPRequestOperation *operation, id responseObject) {

                   NSString * obj = [[NSString alloc] initWithData:responseObject encoding:NSUTF8StringEncoding];

                   NSLog(@"obj == %@",obj);

        } failure:^(AFHTTPRequestOperation *operation, NSError *error) {

            NSLog(@"faild -- ");

        }];

    這和上面的效果是一樣的 -- 

    我們看到，前面返回的資料全部為 NSdata - 為我們添加了麻煩 -- 而且我們大部分的 api 返回資料都為 json -- 

    同樣 - 我們可以用 AFHTTPRequestOperation 的子類 AFJSONRequestOperation 來替代 -- 

    方法三 -- 

       NSDictionary * params = @{@"apiver": @"4",@"id" : @"830755858",@"extra_info": @"1"};

    

    

AFHTTPClient * client = [[AFHTTPClient alloc] initWithBaseURL:[NSURL URLWithString:@"http://api.jiepang.com"]];

    

    NSURLRequest * request = [client requestWithMethod:@"POST"

                                                  path:@"users/show"

                                            parameters:params];

    

    

    AFJSONRequestOperation * operation = [AFJSONRequestOperation JSONRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, id JSON) {

        

        NSLog(@"json == %@",JSON);

    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, id JSON) {

        

        NSLog(@"faild -- ");

    }];

    

    [operation start];

    使用情境 2 ： 非同步載入圖片 

    AFImageRequestOperation 是繼承自 AFHTTPRequestOperation -- 所以 - 方法大同小異 -- 

    NSString * url = @"http://c.hiphotos.baidu.com/album/w=2048/sign=1d7ca85bac345982c58ae29238cc30ad/f2deb48f8c5494ee7abe33362cf5e0fe99257e04.jpg";

    // 這是一個大美女

    

    建立 request

    NSURLRequest * request = [NSURLRequest requestWithURL:[NSURL URLWithString:url]

                                              cachePolicy:NSURLRequestReloadIgnoringLocalCacheData

                                          timeoutInterval:30];

    

    AFImageRequestOperation * operation = [AFImageRequestOperation imageRequestOperationWithRequest:request

                                                                               imageProcessingBlock:^UIImage *(UIImage *image) {

                                                                                   

                                                                                   UIImage * tempImage = [UIImage imageWithCGImage:

                                                                                                         CGImageCreateWithImageInRect(image.CGImage,ake(0, 0, image.size.width, image.size.height/2.0))];

                                                                                   

                                                                                   return tempImage;

                                                                                   

                                                                               } success:^(NSURLRequest *request, NSHTTPURLResponse *response, UIImage *image) {

                                                                                   

                                                                                   NSLog(@"reload image success ");

                                                                                   

                                                                                   _imageView.image = image;

                                                                               } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error) {

                                                                                   

                                                                                   NSLog(@"reload image faild , error == %@ ",error);

                                                                                   

                                                                               }];

    

    [operation start];

    這個方法裡有三個block ，success 和 failure 不說 -- processimageBlock -- 是在 圖片載入完後，對 圖片 處理的 block ，可以為 nil ，在 success 之前調用  --

iOS 使用AFNetworking