Objective C, update table view after async operation - ios

Question

I am running an async operation which loops through a json data file which should then update a table view.
Here's the code i'm using.
-(void) TopDealsRecieve:(NSString *)Devicetoken;
{
currentcount = 0;
allcontent = newArray;
//Send device token and retireve TopDeals
NSString *mainURL = #"http://myurl.com/api/";
NSString *firstprefix = #"type=apicall&device=";
NSString *deviceIDforURL = [NSString stringWithFormat:#"%#", Devicetoken];
NSString *stringToGoToEncoder = [NSString stringWithFormat: #"%#%#", firstprefix, deviceIDforURL];
NSData *plainData = [stringToGoToEncoder dataUsingEncoding:NSUTF8StringEncoding];
NSString *base64String = [plainData base64EncodedStringWithOptions:0];
NSString *returnURL = [NSString stringWithFormat:#"%#%#", mainURL, base64String];
NSURL *returncompletedURL = [[NSURL alloc] initWithString:returnURL];
//Retrieve Dictionary of Top Deals
NSURLRequest *request = [[NSURLRequest alloc] initWithURL:returncompletedURL];
AFHTTPRequestOperation *operation = [[AFHTTPRequestOperation alloc] initWithRequest:request];
operation.responseSerializer = [AFJSONResponseSerializer serializer];
operation.responseSerializer.acceptableContentTypes = [NSSet setWithObject:#"text/html"];
[operation setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
//Get all output and store for segue
NSLog(#"%#", responseObject);
currentcount++;
numrows = [responseObject valueForKey:#"rows"];
numrowscompare = [numrows integerValue];
allLogos = [[responseObject valueForKey:#"data"] valueForKey:#"logo"];
allcontent = [[responseObject valueForKey:#"data"] valueForKey:#"content"];
allpostode = [[responseObject valueForKey:#"data"] valueForKey:#"postcode"];
NSLog(#"%lu", (unsigned long)allcontent.count);
allname = [[responseObject valueForKey:#"data"] valueForKey:#"name"];
alladdress = [[responseObject valueForKey:#"data"] valueForKey:#"address"];
alladdress2 = [[responseObject valueForKey:#"data"] valueForKey:#"address2"];
alllat = [[responseObject valueForKey:#"data"] valueForKey:#"lat"];
alllong = [[responseObject valueForKey:#"data"] valueForKey:#"lng"];
allstart = [[responseObject valueForKey:#"data"] valueForKey:#"start"];
allfinish = [[responseObject valueForKey:#"data"] valueForKey:#"finish"];
allstartnice = [[responseObject valueForKey:#"data"] valueForKey:#"nicestart"];
allfinishnice = [[responseObject valueForKey:#"data"] valueForKey:#"nicefinish"];
// hide the ticker
[self.tableview reloadData];
} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
// 4
UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:#"Error Retrieving Top Deals check internet connection!"
message:[error localizedDescription]
delegate:nil
cancelButtonTitle:#"Ok"
otherButtonTitles:nil];
[alertView show];
}];
[operation start];
}
When running the operation all the data comes in fine to the console, however the table view does not update with the correct data. It updates with the data in the all content array from before calling the function.
It seems that the data from the server isn't being passed to the table view quick enough. I somehow need to get the table view to reloadData AFTER the operation has been completed in some sort of queue.
[self.tableview reloadData];
Sorry if not too clear, any help appreciated.

Answer 1

If allContent is the NSArray your UITableViewDatasource uses, then you never update it in your completionBlockWithSuccess, so this isn't a problem of async update but rather a simple mistake : update allContent just before calling reloadData.
(One additionnal remark : using 'Global' arrays is bad!)