Question

我使用Parse作为我的应用程序的后端，似乎配置文件照片显示不正确，如图所示：

john_appleseed的照片上有一条黑条。

这是我保存个人资料图片的代码：

NSData *profileData = UIImagePNGRepresentation(cell1.profileView.image);
PFFile *profileFile = [PFFile fileWithName:@"profilePhoto" data:profileData];
[profileFile saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error)
     {
          if (!error)
         {
             if (succeeded)
             {
                 [user setObject:profileFile forKey:@"profilePhoto"];
                 [user saveInBackgroundWithBlock:^(BOOL succeeded, NSError *error)
                  {
                      if (!error)
                      {

                      }
                      else
                      {

                      }
                  }];
             }
         }
     }];

这是我如何检索图像:(在PFQueryTableViewController内）

- (PFQuery *)queryForTable
{
    //NSLog(@"called");
    NSUserDefaults* defaults = [NSUserDefaults standardUserDefaults];
    NSString *filter = [defaults objectForKey:@"topicFilter"];
    NSLog(@"queryfortable: %@", filter);
    PFQuery *query = [PFQuery queryWithClassName:@"Questions"];
    [query includeKey:@"user"];
    [query whereKey:@"category" equalTo:filter];
    [query orderByDescending:@"createdAt"];
    return query;
}

- (PFObject *)objectAtIndexPath:(NSIndexPath *)indexPath
{
    if (indexPath.section == self.objects.count)
    {
        return nil;//this is for the load more cell.
    }
    return [self.objects objectAtIndex:indexPath.section];
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath object:(PFObject *)object

中的

PFUser *user = [object objectForKey:@"user"];
PFImageView *profileImgView = (PFImageView *)[cell viewWithTag:1];
profileImgView.layer.cornerRadius = profileImgView.frame.size.height/2;
profileImgView.layer.masksToBounds = YES;
PFFile *file = user[@"profilePhoto"];
profileImgView.file = file;
[profileImgView loadInBackground];

任何想法？非常感谢。

Answer 1

您应该在主线程上更新用户界面。由于您在后台加载某些东西，您应该通知主线程它需要更新一个对象。 NSString *requestURL = file.url; // Save copy of url locally (will not change in block) [file getDataInBackgroundWithBlock:^(NSData *data, NSError *error) { if (!error) { //dispatch on main thread UIImage *image = [UIImage imageWithData:data]; } else { NSLog(@"Error on fetching file"); } }];正在异步下载文件。

以下是一个示例，您可以根据自己的需要进行更改，只是为了说明，更新回调中的UI组件会带来好处;这是基于Parses自己的BFS：

with=FALSE

iOS解析个人资料图片上的黑色条带（PFImageView）

1 个答案: