在视图控制器之间传输数据。从 Parse 加载数据时。数据在解析查询填充数据之前传输

Question

我知道如何在视图控制器之间传输数据，但是在我能够完成解析查询之前数据正在传输，因此在视图控制器之间传输数据时数据丢失了。我使用的代码如下。第一部分与解析查询相关，最后一部分详细说明数据的发送。我怎样才能得到它，以便数据在传递到新视图之前成功存储在 phoneNUMBERS 中？因为目前是作为 NULL 传递的。

NSMutableArray *phoneNUMBERS = [NSMutableArray new];
    // Initialize table data
    PFQuery *query = [PFQuery queryWithClassName:@"friendsAssociation"];
    //quesrys the class Friend asssociation to find when instances of "user" equal the
    //logged in user's username
    [query whereKey:@"user" equalTo:usernamecontrol];
    [query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
        if (!error) {
            // The find succeeded.
            NSLog(@"Successfully retrieved %d users.", objects.count);
            // Do something with the found objects
            if (objects.count == 0) {
                //uialert letting the user know that no phone number matches the query
                UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"No User"
                                                                message:@"No user matches this username"
                                                               delegate:self
                                                      cancelButtonTitle:@"OK"
                                                      otherButtonTitles:nil];
                [alert show];








        }
        //if there is only one number matching the query

        if (objects.count >=1) {


            int i=0;

            for (PFObject *object in objects) {

                NSLog(@"%@", objects[i]);


                NSString *phonenumber = object[@"phoneNumber"];





                NSLog(@"%@", phonenumber);

                [phoneNUMBERS addObject:phonenumber];
            }





            NSLog(@"%@", phoneNUMBERS[1]);




            //if there is more than one phonenumber matching the query as
            //the user to input the friends username
            //instead


        } else {
            // Log details of the failure
            NSLog(@"Error: %@ %@", error, [error userInfo]);
        }
    }}];

ContactTableViewController *contacts = [[ContactTableViewController alloc]initWithNibName:Nil bundle:Nil];
contacts.user = usernamecontrol;
contacts.PHONENUMBERS = phoneNUMBERS;


[self presentViewController:contacts animated:YES completion:Nil];

Answer 1

你需要放这部分代码

ContactTableViewController *contacts = [[ContactTableViewController    alloc]initWithNibName:Nil bundle:Nil]; 
contacts.user = usernamecontrol;
contacts.PHONENUMBERS = phoneNUMBERS;

[self presentViewController:contacts animated:YES completion:Nil];

进入完成块的"succesful"部分。 IE。

之后

// Do something with the found objects

并在下一行之前加上 if。

在视图控制器之间传输数据。从 Parse 加载数据时。数据在解析查询填充数据之前传输

Transferring Data between view controllers. While loading data from Parse. Data is transferred before Parse Query Populates the data

loading

ios

parse-platform

presentviewcontroller