cellForRowAtIndexPath：被调用但没有显示在tableview中

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!