cellForRowAtIndexPath: gets called but nothing shows up in tableview - ios

Question

I have an ordinary tableview with custom cells, working perfectly on iOS 6.0 but after upgrading the app to iOS 10, scattered problem arises.
Note: The app works as expected on iPhone 5, both on simulator and on a real device. All devices are running iOS 10.2 but iPhone 6 and above has the issues described below.
Some tableviews work fine just like before, while one of the tableViews always shows exactly 1 cell (even tough cellForRowAtIndexPath is called 7 times) and another table shows no cells at all despite cellForRowAtIndexPath getting called twice.
I am wondering why the method is called if the tableview does not care to display the result?
I am at a total loss as to what is going on and how to fix it. Been at it for a day with no progress at all. I have tried cleaning and running different builds and can not get the affected tableviews to behave correctly. I don't know what to try next? Any help is appreciated, thanks!
Ok since you need some code here is a part of it that is not that sensitive. DataSource:
- (void)viewDidLoad
{
[super viewDidLoad];
NOSUserInfo2 *userInfo = [S24SharedUserHandler currentUser];
dataSource = [NSMutableArray arrayWithArray:[userInfo children]];
if([userInfo student] || [userInfo teacher])
{
[dataSource insertObject:userInfo atIndex:0];
}
self.contentSizeForViewInPopover = CGSizeMake(250, 45*dataSource.count-1);
self.tableView.backgroundColor=[UIColor colorWithWhite:0.95f alpha:1];
self.tableView.scrollEnabled=NO;
[self.tableView registerNib:[UINib nibWithNibName:#"NOSPersonSelectorCell" bundle:nil] forCellReuseIdentifier:#"PersonPopoverCell"];
}
This gets called 2 times:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"PersonPopoverCell";
NOSPersonSelectorCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
cell.selectionStyle=UITableViewCellSelectionStyleNone;
cell.textLabel.font = [UIFont fontWithName:#"HelveticaNeue-Medium" size:15];
cell.textLabel.backgroundColor=[UIColor clearColor];
NSObject *dataObject = [dataSource objectAtIndex:[indexPath row]];
if ([dataObject isKindOfClass:[NOSUserInfo2 class]]) {
cell.textLabel.text = [(NOSUserInfo2 *)dataObject name];
cell.pk = [(NOSUserInfo2 *)dataObject personPK];
}
else {
cell.textLabel.text = [(NOSChild2 *)dataObject childName];
cell.pk = [(NOSChild2 *)dataObject childPK];
}
cell.textLabel.textColor = [UIColor colorWithWhite:0.18f alpha:1];
//NSLog(#"%d", [S24SharedUserHandler selectedPk]);
cell.checkmark.hidden=cell.pk!=[S24SharedUserHandler selectedPk];
return cell;
}
And the result is that the tableview is empty.
New information 11 Jan 2017
The app works when testing on phone, but not on simulator. I still have no idea what is wrong and am really dissapointed in the downvotes I am still getting for asking this question. I would appreciate if somebody can explain why they think it is a bad question.
Apparently everything works on an iPhone 5. It does not work on iPhone 6 and up. Be advised that the iOS is still 10.2, for both the iPhone 5 and iPhone 6 and 7 also have iOS 10.2
Since the only difference between working and not working is the device, not ios version, I am now leaning towards it being an UI bug that only occurs at certain sizes.
One other issue that arises is that my gesturerecognizer also only works on iPhone5 and not 6+
New info!
I can fix the problem by commenting the heightForRowAtIndexPath code. This now means that I need some other way to adjust the height of certain cells and that is the current problem. I still have no idea at all why uitableview behaves this way.

Answer 1

The reason for this particular problem was that the method "heightForRowAtIndexPath" returns a double on iPhone 5 and long on iPhone 6, to be correct, one should use a defined datatype called "CGFloat"!
It was not easy to find this problem and I hope I can help someone else with this. Also thanks to anyone that tried to help!