无法将 PFUser 作为 PFObject 传递 [英] Having trouble passing PFUser as a PFObject

问题描述

所以在我的应用程序中，我想通过单击 UIButton 来实现用户配置文件，我已经完成了所有功能.

so in my app, I want to implement user profiles by clicking on a UIButton, I have all the functionality done.

我首先添加了在选择 indexPath.section 时显示用户信息的功能，所以我想通过一个按钮来做同样的事情.

I first added the functionality when the indexPath.section is selected the user information is shown, so then I wanted to do the same thing through a button.

这是我在 -(void)didSelectRow

PFObject *object = [self.objects objectAtIndex:selectedRow];
PFUser *user = [object objectForKey:@"userTookPhoto"];

self.userInfo = user;

self.userInfo 是 .h 文件中的一个属性 PFUser

self.userInfo is a property PFUser in the .h file

然后在我的 PrepareSegue 中我有这个:

Then in my PrepareSegue I have this :

else if ([segue.identifier isEqualToString:@"homeToProfile2"])
    {

        transfer.userInformationObject = self.userInfo;
    }

我运行应用程序，然后点击按钮以推动 segue，应用程序崩溃，说 self.userInfo 为 NULL.

I run the app, and i tap on the button to push segue and the app crashes saying that self.userInfo is NULL.

当我在 didSelectRow 中 NSlog 它时，它的信息与所有用户详细信息都是正确的，当我在 prepareSegue 中 NSlog 它时它崩溃了，因为它说它是 NULL.

When I NSlog it in didSelectRow, it has the information correct with all the user details, when I NSlog it in the prepareSegue it crashes as it says it is NULL.

推荐答案

如果要访问 PFObject 中的 PFObjects 对象，则需要在 PFQuery 中包含includeKey: 方法并传入PFObject 所在的字段...

If you want to access PFObjects objects within a PFObject, you need to include within your PFQuery the includeKey: method and pass in the field that the PFObject is...

因此，如果您访问 PFObject 中的 PFUser 对象，其类名为Message"，则您可以像这样创建查询...

So if your accessing a PFUser object within a PFObject whose classname is 'Message', you create the query like so...

PFQuery *query = [PFQuery queryWithClassname:@"Message"];
[query whereKey:@"toUser" equalTo:[PFUser currentUser]];
[query includeKey:@"toUser"];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error){
    for (PFObject *obj in objects) {
         NSLog(@"%@", [obj objectForKey:@"toUser"]);
    }
}];

日志语句将返回 PFUser 对象.

The log statement will return the PFUser object.

这是在 Parse 上对您的问题的解释的链接博客

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