Parse.com查询表视图中的所有用户

Question

How would I go about displaying a list of all users in the parse.com database in a tableview and then when they click on each table, display that particular user's information.

All I know is that in order to query the users I must use:

PFQuery *query = [PFUser query];

Thank you in advance and any help is much appreciated.

Answer 1

You're really asking a specific question about Parse queries, but it seems like you don't understand queries in general, so just start with a general query against Parse:

PFQuery *query = [PFQuery queryWithClassName:@"_User"];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
    if (error) {
        // Something went wrong
    } else {
        // objects is an array of PFObject containing your results
    }
}];

As you figured out, you can also do a user query by making that first line:

PFQuery *query = [PFUser query];

The rest is the same.

Lyndsey Scott is right, this is basic stuff in the docs. I'm posting this here because of the one "gotcha" which is the class name (_User instead of User) if you use the first method.

What you generally will do is call [myTableView reloadData] inside the success block since you now have an array of users. In your didSelectCellAtIndexPath: perform a seque with a new viewcontroller, and in your prepareForSegue method, pass the user object to your pushed view controller so it knows what user to show.

Answer 2

I assume you know how to use table view. So I'll implement it this way:

1.create a property

@property (nonatomic) NSArray *users;

2.In viewDidAppear execute the query:

PFQuery *query = [PFUser query];
[query setLimit:1000];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
    if (!error) {
        self.users = objects;
        [self.tableView reloadData];
    }
}];

3.You need to implement table view code, the most important is cell

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    static NSString *cellIdentifier = @"userCell";
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellIdentifier];
    PFUser *user = self.users[indexPath.row];
    cell.textLabel.text = user.username;
    return cell;
}

Beside that you also need all of the required table view's data source code to tell it the number of cell. If you'll need some help with that just tell.