iPhone - PFRelation不保存对象

Question

我刚开始解析并尝试创建一个将用户链接到他/她的图片的PFRelation。这是我的代码：

NSData *imageData = UIImagePNGRepresentation(myImage);
PFFile *imageFile = [PFFile fileWithName:@"image.png" data:imageData];
PFObject *pic = [PFObject objectWithClassName:@"Pics"];
//[pic setObject:imageFile forKey:@"Image"];
pic[@"Image"] = imageFile;
PFUser *user = [PFUser currentUser];
PFRelation *relation = [user relationForKey:@"myPhotos"];
[relation addObject:pic];
[user saveInBackground];
//[pic saveInBackground];


NSString * storyboardName = @"Main";
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:storyboardName bundle: nil];
UIViewController *myViewController = [storyboard instantiateViewControllerWithIdentifier:@"MainScreen"];
[self presentViewController:myViewController animated:YES completion:nil];

我知道图片本身是在保存，因为当我让图片保存在背景中时，当我单击Pic类时，它会显示我拍摄的图片。但是，我的问题是，当我查看User类时，当我单击myPhotos关系时，该关系中没有对象。为什么我的形象不被添加到关系中？

Answer 1

PFObject *details = PFObject objectWithClassName:@"**your table name*“；NSData *imageData = UIImagePNGRepresentation(myImage)；PFObject *picDetails = PFObject objectWithClassName：@@”**myphotos**“；picDetails @”图片“= UIImage imagewithdata:imageData；Details保存；picDetails保存；FRelation *relation = Details PFObject：@@”**myphotos**“；关系addObject:details；[详细信息保存saveInBackgroundWithBlock:^(BOOL成功，NSError *error) {//在上次保存后执行某些操作.如果(成功){ //对象已被保存。UIAlertView *success_alert = [UIAlertView allocinitWithTitle：@“成功”消息：@“成功图像保存”委托: success_alert：@“OK”otherButtonTitles: nil]；success_alert显示；}{ //有一个问题，请检查error.description UIAlertView *fail_alert = [UIAlertView allocinitWithTitle:@"Failed“消息：@”未能保存数据“委托:self：@”OK“otherButtonTitles: 0]；fail_alert show；}]； 这是使用图像保存在PFRelation中存储的方法。我希望这个答案能对你有所帮助。谢谢。