iOS 使用AFNetworking

一 下载: 网址 -- github
 
二 环境:
  需要引入的库 - CoreLocation.framework
  SystemConfiguration.framework
  MobileCoreServices.framework
  Security.framework
 
  需要在 ARC 的环境下 - 非 ARC 的工程中 - 请添加 -fobjc-arc 
 
三 结构:
1 : AFHTTPClient  --   提供了一个方便的网络交互接口,包括默认头,身份验证,是否连接到网络,批量处理操作,查询字符串参数序列化,已经多种表单请求
 
2 : AFHTTPRequestOperation -- 
和它得子类可以基于http状态和内容列下来区分是否成功请求了
 
3 : AFURLConnectionOperation -- 
和它的子类继承NSOperation的,允许请求被取消,暂停/恢复和由NSOperationQueue进行管理。
 
4 : AFURLConnectionOperation -- 
可以让你轻松得完成上传和下载,处理验证,监控上传和下载进度,控制的缓存。
 
四 使用 :
 
用法场景 1 : 请求api数据
 
方法1 --
 
创建一个 AFHTTPClient 实例
 
AFHTTPClient * client = [[AFHTTPClient alloc] initWithBaseURL:[NSURL URLWithString:@"http://api.jiepang.com"]];
// 这里一定要有一个 baseURL - 不然会抛出一个异常 -- 
 
创建一个 NSURLRequest 实例
 
NSDictionary * params = @{@"apiver": @"4",@"id" : @"830755858",@"extra_info": @"1"};
    NSURLRequest * request = [client requestWithMethod:@"POST"
                                              path:@"users/show"
                                        parameters:params];
 
    @param  method 网络请求方式,比如 GET,POST,PUT,DELETE , 不能为 nil -- 
    @param  path   和 baseURL 组合成为一个 url  -- 通俗的说,就是我们调用的接口 -- 比如,我想调用http://api.jiepang.com/users/show,这个接口 -- 那么 baseURL 为 http://api.jiepang.com -- path 为users/show 
    @param  parameters 网络请求参数 -- http://api.jiepang.com/v1/users/show?id=123 -- id=123 就是这个参数
 
 
创建一个 AFHTTPRequestOperation 实例进行网络链接
 
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];
 
    这样 - 一次简单的调用就OK了 - 
 
    当然也可以,用封装好的其它方法 -- 
    - (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;
 
 
省去了组装 Resquest 的时间  --
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 -- ");
        }];
 
    这和上面的效果是一样的 -- 
 
    我们看到,前面返回的数据全部为 NSdata - 为我们添加了麻烦 -- 而且我们大部分的 api 返回数据都为 json -- 
    同样 - 我们可以用 AFHTTPRequestOperation 的子类 AFJSONRequestOperation 来替代 -- 
 
    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];
 
 
 
    使用场景 2 : 异步加载图片 
 
    AFImageRequestOperation 是继承自 AFHTTPRequestOperation -- 所以 - 方法大同小异 -- 
 
    NSString * url = @"http://c.hiphotos.baidu.com/album/w=2048/sign=1d7ca85bac345982c58ae29238cc30ad/f2deb48f8c5494ee7abe33362cf5e0fe99257e04.jpg";
    // 这是一个大美女
    
    创建 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];
 
    这个方法里有三个block ,success 和 failure 不说 -- processimageBlock -- 是在 图片加载完后,对 图片 处理的 block ,可以为 nil ,在 success 之前调用  --
原文地址:https://www.cnblogs.com/Sucri/p/4744077.html