iOS looping error - ios

Question

So I'm having a weird problem with loops in while developing in iOS. There are over hundreds of lines of code, so instead of boring you with it, I'm going to describe the problem.
I am trying to upload events from Facebook to an Microsoft Azure server. To do so, I made a class called FacebookUploader. In that class, I loop through the events of Facebook (and set all the variables to the class. ie. the name of the first event is self.event, when loops continues and goes to the second event, that events name is self.event now). What I expected iOS to do was to go through each event in the loop, upload it, and then move onto the next one.
This worked while I was just uploading the event. Now, I'm also first checking the database to see if the event is already there. And then when I get confirmation that it's not there, I upload it. However, when it comes time to upload it, Facebook Uploader has already finished looping through all the events and only the last event gets uploaded (multiple times, one for each event that should be uploaded).
I've pinpointed the error, now I'm asking, what am I doing wrong? Should the variable not be associated with the class and instead be local? Or is there a way to stop running the loop until we get confirmation from the server that the event is not there? Your help is much appreciated.
MSQuery *query = [self.table queryWithPredicate: [NSPredicate predicateWithFormat:#"fb_id == %#", self.id]];
[query readWithCompletion:^(MSQueryResult *result, NSError *error) {
//not in table, add it
NSArray *items = [result.items mutableCopy];
if (items == nil || [items count] == 0) {
NSDictionary *newItem;
if(self.end_time != nil) {
newItem = #{#"fb_id": self.id, #"event_name": self.name, #"event_location": self.location, #"event_start": self.start_time, #"event_end": self.end_time, #"event_description": self.descriptionOfEvent, #"picture_url": self.picture_url, #"event_latitude": self.venue_latitude, #"event_longitude": self.venue_longitude, #"popularity": self.popularity};
}
else {
newItem = #{#"fb_id": self.id, #"event_name": self.name, #"event_location": self.location, #"event_start": self.start_time, #"event_description": self.descriptionOfEvent, #"picture_url": self.picture_url, #"event_latitude": self.venue_latitude, #"event_longitude": self.venue_longitude, #"popularity": self.popularity};
}
[self.table insert:newItem completion:^(NSDictionary *result, NSError *error) {
// The result contains the new item that was inserted,
// depending on your server scripts it may have additional or modified
// data compared to what was passed to the server.
if(error) {
NSLog(#"ERROR %#", error);
} else {
NSLog(#"Todo Item: %#", [result objectForKey:#"event_name"]);
}
}];
}

Answer 1

The answer to the question was given by Paulw11 above. By allocating the variables outside of the loop, I was creating multiple copies of the variables, causing my error. Allocating the variable inside of the loop fixed the error.