ios开发 -- AFNetworking用法

网络请求一般用到的第三方框架是AFN。关于AFN主要以下用法：

1.get请求

    请求网络数据使用git方法，使用方法如下：

    //请求管理器

    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

    // 格式 json

    NSDictionary *dict = @{@"format": @"json"};

    //发起请求

    [manager GET:@"http://115.28.240.82:7990/report/v02/init/3" parameters:dict success:^(AFHTTPRequestOperation *operation,id responseObject){

        if ([responseObject isKindOfClass:[NSDictionary class]]) {

           //根据接口的实际内容取数据，字典或者数组

        }

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

        NSLog(@"%@",error);

    }];

2.post请求

    先写一个系统自带的方法，如下：

       // 设置路径

    NSURL *url = [NSURL URLWithString:@"http://115.28.240.82:7990/report/v01/students/del"];

    //创建请求对象

    NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];

    request.timeoutInterval = 5.0;

    request.HTTPMethod = @"POST";

    //设置请求体

    NSString *param = [NSString stringWithFormat:@"studentId=%@",_cuerntModel.studentId];

    //把拼接后的字符串转换为data，设置请求体

    request.HTTPBody = [param dataUsingEncoding:NSUTF8StringEncoding];

    //发送请求

    NSData *data = [NSURLConnection sendSynchronousRequest:request returningResponse:nil error:nil];

    NSDictionary *returnData = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers error:nil];

     NSLog(@"returnData----%@",returnData);

   向服务器上传数据使用post方法，使用方法如下：

     

    //1.管理器

    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

    //2.设定类型

    manager.requestSerializer = [AFJSONRequestSerializer serializer];

    manager.responseSerializer = [AFJSONResponseSerializer serializer];

    //参数

    NSDictionary *dict = @{@"name":nameText.text,@"photo":JSONImgString};

    //3.发送请求

    [manager POST:@"http://115.28.240.82:7990/report_card/v01/students/modify" parameters:dict success:^(AFHTTPRequestOperation *operation, id responseObject){

    }

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

    }];

3.上传图片

    上传图片给服务器一般分2步：

     a：把选择的图片（可以是相机拍的或者是相册选得），上传给服务器，然后服务器会返回一个网络地址，获取这个网络地址

//afn 方法

    //把取到的图片转成data数据

    NSData *imageData = UIImageJPEGRepresentation(currentImage, 0.5);

    

    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

    manager.requestSerializer = [AFJSONRequestSerializer serializer];

    manager.responseSerializer = [AFJSONResponseSerializer serializer];

    [manager POST:@"http://115.28.240.82:7990/report/v06/files/images/"parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData>formData){

        [formData appendPartWithFileData:imageData name:@"file" fileName:@"demo.jpg" mimeType:@"image/png"];

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

        NSLog(@"----------------%@",responseObject);

        JSONImgString = [NSString stringWithFormat:@"%@",responseObject[@"data"][@"defaultPath"]];

        NSLog(@"success:%@", JSONImgString);

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

        NSLog(@"error%@",error);

    }];

   b.把a返回的图片的网络地址传给服务器

    //1.管理器

    AFHTTPRequestOperationManager *manager = [AFHTTPRequestOperationManager manager];

    //2.设定类型

    manager.requestSerializer = [AFJSONRequestSerializer serializer];

    manager.responseSerializer = [AFJSONResponseSerializer serializer];

    //参数

    NSDictionary *dict = @{@"@"photo":JSONImgString};

    //3.发送请求

    [manager POST:@"http://115.28.240.82:7990/repord/v01/students/modify" parameters:dict success:^(AFHTTPRequestOperation *operation, id responseObject){

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

    }];