Parse, UITableView and reloaddata - ios

Question

I'm sitting on this almost 4 days and I can't find the problem (already searched google a lot and tried everything but nothing helped). I have this table view I created on my storyboard. Everything is connect BUT when I run my code:
First all the tableView method runs but since array still nil nothing happened. Then after my array got all the data and code says [tableView1 reloadData]; nothing happened and I'm not getting to the tableView methods... (I tried to locate the reloadData in many places in my code and nothing worked).
-(void)viewDidLoad {
[super viewDidLoad];
self.tableView1.dataSource=self;
self.tableView1.delegate=self;
self.tripNamesList = [[NSMutableArray alloc] init];
[self GetTripsList];
PFQuery *query = [PFQuery queryWithClassName:#"Trips"];
NSString *userID = user.objectId;
[query whereKey:#"User_Created_ID" equalTo:userID];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (!error) {
NSLog(#"Successfully retrieved %d trips.", objects.count);
[self.tripNamesList addObjectsFromArray:objects];
NSLog(#"%#", tripNamesList);
for (PFObject *object in objects) {
NSLog(#"%#", object.objectId);
[self.tripNamesList addObject:object ];
}
[tableView1 reloadData];
}
else {
// Log details of the failure
NSLog(#"Error: %# %#", error, [error userInfo]);
}
}];
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [self.tripNamesList count];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSLog(#"Calling 1222rrgdfghgfhdgfdfgfdgdfgd on %#", tableView);
static NSString *CellIdentifier = #"TripCell";
UITableViewCell *cell = [self.tableView1 dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier] ;
}
PFObject *obj2 = [self.tripNamesList objectAtIndex:indexPath.row];
PFQuery *query = [PFQuery queryWithClassName:#"Trips"];
PFObject *searchedItems = [query getObjectWithId:obj2.objectId];
NSString *tempTripName = [searchedItems objectForKey:#"Trip_Name"];
cell.textLabel.text = tempTripName;
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
[self.tableView1 reloadData];
return cell;
}
#end

Answer 1

Try running the reloadData from the main thread:
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (!error) {
NSLog(#"Successfully retrieved %d trips.", objects.count);
[self.tripNamesList addObjectsFromArray:objects];
NSLog(#"%#", tripNamesList);
for (PFObject *object in objects) {
NSLog(#"%#", object.objectId);
[self.tripNamesList addObject:object ];
}
dispatch_sync(dispatch_get_main_queue(), ^{
[self.tableView1 reloadData];
});
}
else {
// Log details of the failure
NSLog(#"Error: %# %#", error, [error userInfo]);
}
}];

Answer 2

You dont need to call [tableView reloadData] everywhere. Once this method is called, the tableview's delegates will be called in order like numberOfRowsInSection and based on the number of rows, that much time cellForRowAtIndexPath will be called. So in your case, you have put reloadData in cellForRowAtIndexPath and it will create an infinte loop, I guess.
Also, since you are filling self.tripNamesList in background thread, you can call reloadData in main thread as like below
for (PFObject *object in objects) {
NSLog(#"%#", object.objectId);
[self.tripNamesList addObject:object ];
}
[self performSelectorOnMainThread:#selector(refreshTableData) withObject:nil waitUntilDone:NO];
Yes, for this you need to have a method like this in your .m
- (void) refreshTableData{
[tableView reloadData];
}
Hope this helps.

Answer 3

Try to move your code from viewdidload to viewdidlayout, viewwillappear or viewdidapear, your table might not be initialised yet at that point.