使用AFN框架发送图片

/**
 *  发送带图片的微博
 */
- (void)sendWithImage
{
    //1.创建请求管理对象
    AFHTTPRequestOperationManager *mgr = [AFHTTPRequestOperationManager manager];
    
    //2.封装请求参数
    NSMutableDictionary *params = [NSMutableDictionary dictionary];
    params[@"status"] = self.textView.text;
    params[@"access_token"] = [AccountTool account].access_token;
    
    //3.发送
    [mgr POST:@"https://upload.api.weibo.com/2/statuses/upload.json" parameters:params constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
        //必须在这里说明要上传那些文件
        NSData *data = UIImageJPEGRepresentation(self.imageView.image, 0.2);
        [formData appendPartWithFileData:data name:@"pic" fileName:@"1.jpg" mimeType:@"image/jpeg"];
    }  success:^(AFHTTPRequestOperation *operation, id responseObject) {
        
        [MBProgressHUD showSuccess:@"发送成功"];
        
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        
        [MBProgressHUD showError:@"发送失败"];
    }];
}

处理多张图片的情况:

 //1.创建请求管理对象
    AFHTTPRequestOperationManager *mgr = [AFHTTPRequestOperationManager manager];
    
    //2.封装请求参数
    NSMutableDictionary *params = [NSMutableDictionary dictionary];
    params[@"status"] = self.textView.text;
    params[@"access_token"] = [AccountTool account].access_token;
    
    //3.发送
    [mgr POST:@"https://upload.api.weibo.com/2/statuses/upload.json" parameters:params constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
        //必须在这里说明要上传那些文件
        NSArray *images = [self.photosView totalImages];
        int count = 0;
        for (UIImage *image in images) {
            count++;
            NSData *data = UIImageJPEGRepresentation(image, 0.2);
            NSString *fileName = [NSString stringWithFormat:@"%d.jpg",count];
            [formData appendPartWithFileData:data name:@"pic" fileName:fileName mimeType:@"image/jpeg"];
        }
    }  success:^(AFHTTPRequestOperation *operation, id responseObject) {
        
        [MBProgressHUD showSuccess:@"发送成功"];
        
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        
        [MBProgressHUD showError:@"发送失败"];
    }];