选择本地图片上传到服务器进行头像设置以及文件下载

    需要实现的协议

@interface RegistController ()<UIImagePickerControllerDelegate, UINavigationControllerDelegate>

- (void)postHeadImage{
    //打开 图片的用户交互
    self.headimageView.userInteractionEnabled = YES;
    
    //创建一个点击手势
    UITapGestureRecognizer * tapGR = [[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(tap_View:)];
    [self.headimageView addGestureRecognizer:tapGR];
}
//点击手势的事件
- (void)tap_View:(UITapGestureRecognizer *)tapGR{
    //点击图片后, 调用相册, 选取图中的图片,
    //[说明]照片的获取有两种方式, 1) 调用摄像头,模拟器不能使用摄像头,需要真机  2)第二种方式是调用相册获取图片
    //先判断摄像头是否可用,
//    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
//        //摄像头可用
//        [self loadImageWithType:UIImagePickerControllerSourceTypeCamera];
//    }else{
//        //摄像头不可用
//        
//    }
    
    
    //调用相册
    [self loadImageWithType:UIImagePickerControllerSourceTypePhotoLibrary];

}

//调用摄像头或相册,调用此函数
- (void)loadImageWithType:(UIImagePickerControllerSourceType)imageType{
    /**数据来源枚举
     
     UIImagePickerControllerSourceTypePhotoLibrary,      相册
     UIImagePickerControllerSourceTypeCamera,            照相机
     UIImagePickerControllerSourceTypeSavedPhotosAlbum   调用已经保存的文件(如: 图片, 视频均可)
     
     */

    //1. 创建图片容器
    UIImagePickerController * picker = [[UIImagePickerController alloc]init];
    //2. 设置操作类型
    picker.sourceType = imageType;
    //3. 给图片容器签订协议<UIImagePickerControllerDelegate,UINavigationControllerDelegate>
    picker.delegate = self;
    
    //4. 显示图片容器的视图
    [self presentViewController:picker animated:NO completion:nil];
}

//协议回调函数, 此函数在相册中或摄像头中选择一张照片时, 被回调
/**
 *  @param picker 当前的图片容器
 *  @param info   选取的图片信息
 */
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{
    //从参数中获取选取的图片
    UIImage * image = info[UIImagePickerControllerOriginalImage];
    //把图片显示到页面控件中
    self.headimageView.image = image;
    
    //上传图片到服务器
    //1. 图片转换成NSData
    NSData * data = UIImagePNGRepresentation(image);
    //2. post方式上传data
    AFHTTPRequestOperationManager * manager = [AFHTTPRequestOperationManager manager];
    manager.responseSerializer = [AFHTTPResponseSerializer serializer];
    
    //上传文本数据
//    [manager POST:@"http://10.0.8.8/sns/my/upload_headimage.php" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
//        //网络请求成功回调块
//        
//    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
//        //网络请求失败回调块
//        
//    }];
    
    [manager POST:@"XXXXXXXX"  parameters:nil constructingBodyWithBlock:^(id<AFMultipartFormData> formData) {
        //指定上传图片(NSData) 上传文本之外的数据
        //参数1: 要上传得附件
        //参数2: 上传文件的名称, 与后台key值一致
        //参数3: 所上传的附件的名字(应该保证上传的文件名不重复: 策略: 年月日时分秒毫秒3到5位随机数)
        //参数4: 上传附件的扩展名
        [formData appendPartWithFileData:data name:@"headimage" fileName:@"1.png" mimeType:@"image/png"];
        
    } success:^(AFHTTPRequestOperation *operation, id responseObject) {
        //网络请求成功回调块
        
        NSLog(@"%@", [NSJSONSerialization JSONObjectWithData:responseObject options:NSJSONReadingMutableContainers error:nil][@"message"]);
        
    } failure:^(AFHTTPRequestOperation *operation, NSError *error) {
        //网络请求失败回调块
        NSLog(@"%@", error);
    }];
    
    [picker dismissViewControllerAnimated:YES completion:nil];
}

下载文件

- (IBAction)btn_Download:(id)sender {
    // 完成图片的下载功能
    //1. 创建下载管理类对象, 初始化配置文件
    AFURLSessionManager * manager = [[AFURLSessionManager alloc]initWithSessionConfiguration:[NSURLSessionConfiguration defaultSessionConfiguration]];
    
    //2. 确定下载地址
    NSString * path = @"http://c.hiphotos.baidu.com/baike/c0%3Dbaike92%2C5%2C5%2C92%2C30/sign=38c40c12718da9775a228e79d138937c/96dda144ad345982c0e32ab30ef431adcbef84a2.jpg";
    //3. 提交请求时, 应该擦除掉地址中的非法字符, 使用utf-8 编码格式
    //NSString * urlString = [path stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
    //4. 设置请求对象
    NSURL * url = [NSURL URLWithString:path];
    NSURLRequest * request = [NSURLRequest requestWithURL:url];
    
    //5. 发送请求进行下载
    NSURLSessionDownloadTask * task = [manager downloadTaskWithRequest:request progress:nil destination:^NSURL * _Nonnull(NSURL * _Nonnull targetPath, NSURLResponse * _Nonnull response) {
        //告知下载后文件的存在路径
        //NSHomeDirectory()  沙盒路径, 手机运行程序, 或程序读取的空间
        NSString * filePath = [NSHomeDirectory() stringByAppendingString:@"/Documents/123.png"];
        NSLog(@"%@", filePath);
        return [NSURL fileURLWithPath:filePath];
        
    } completionHandler:^(NSURLResponse * _Nonnull response, NSURL * _Nonnull filePath, NSError * _Nonnull error) {
        //判断下载是否出错
        if (error) {
            NSLog(@"%@", error);
        }else{
            NSLog(@"下载成功,  下载路径:%@", filePath);
        }
        
    }];
    
    //6. 启动下载
    [task resume];
    
}