ios - 检索自定义用户的个人资料图片

Question

我在检索发表评论的用户的个人资料图片时遇到问题。这是我正在使用的代码

HTKSampleTableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:@"commentReuseID"];
PFObject *comment = [comments objectAtIndex:indexPath.row];
cell.commentLabel.text = [comment objectForKey:@"text"];

NSDateFormatter* formatter = [NSDateFormatter new];
[formatter setTimeStyle:NSDateFormatterShortStyle];
[formatter setDateStyle:NSDateFormatterShortStyle];
NSString* uploaded = [formatter stringFromDate:comment.createdAt];

cell.timeLabel.text = uploaded;

cell.titleLabel.text = [comment objectForKey:@"author"];


[cell.samImageView loadInBackground];


PFUser *currentUses = [comment objectForKey:@"author"];

[currentUses fetchIfNeededInBackgroundWithBlock:^(PFObject *object, NSError *error) {
   NSString *userphoto = [object objectForKey:@"image"];
    NSLog(@"%@", userphoto);

}];

当我使用 NSLog 时，currentUses 返回用户的用户名，因为我将其保存在我的帖子类中作为“作者”。

这是我得到的错误:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[__NSCFString fetchIfNeededInBackgroundWithBlock:]: unrecognized selector sent to instance 0x15f4d670'

上面的查询确实有:[query includeKey:@"user"];

Answer 1

[comment objectForKey:@"author"] 返回的值是 NSString 而不是 PFUser。所以你得到了异常(exception)。