EmptyDataSet view disappears on reloadData

[zentraedi]

Hi!

I'm integrating DZNEmptyDataSet in my project and falls into place. However, i have a method that fetches the data for the tableview from the backend and as soon as i call reloadData, the table view shows the prototype cell i have defined.

This is the code:

[self fetchTransactionsOnCompletion:^(BOOL success) {
        if (success) {
            [self.overallTransactionsAmount setText:[NSString stringWithFormat:@"$%0.2f", [_transactions overallAmount]]];
            [self.tableView reloadData];
            [HUD hide:YES];
        }else{
            [alert show];
        }
    }];

If i don't call reloadData the DZNEmptyDataSet view shows just fine. If i call reloadData, be it in viewDidLoad, viewWillAppear or pull down refresher, it just goes away.

Am i missing something?

Thanks in advance...

[dzenbot]

Have you tried this?

[zentraedi]

Actually yes, but then it shows an empty view.

Any idea what can be happening?

Thanks again.

[dzenbot]

It's hard to tell without seeing any of your implementation.
Please publish a gist of your view controller implementation.

[zentraedi]

Sure.

-(void)viewDidLoad
{
    [super viewDidLoad];

    self.tableView.emptyDataSetSource = self;
    self.tableView.emptyDataSetDelegate = self;

    refreshControl = [[UIRefreshControl alloc]init];
    [self.tableView addSubview:refreshControl];
    [refreshControl addTarget:self action:@selector(refreshTable) forControlEvents:UIControlEventValueChanged];

    self.tableView.tableFooterView = [[UIView alloc] initWithFrame:CGRectZero];
}

-(void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    alert = [[UIAlertView alloc] initWithTitle:@"Error fetching data" message:@"Please try again." delegate:self cancelButtonTitle:nil otherButtonTitles:@"Got it!", nil];

    [self showSimpleHUDWithLabel:@"Fetching transactions..."];
    [self fetchTransactionsOnCompletion:^(BOOL success) {
        if (success) {
            [self.overallTransactionsAmount setText:[NSString stringWithFormat:@"$%0.2f", [_transactions overallAmount]]];
            [self.tableView reloadEmptyDataSet];
            [HUD hide:YES];
        }else{
            [alert show];
        }
    }];

}

I have an UIView above the table and i'm not sure if that's causing the issue.

Thanks again!

[dzenbot]

By implementation, I meant the DZNEmptyDataSetSource and DZNEmptyDataSetDelegate implementations.

[z0527z]

I also have the same problem in the condition of calling [tableView reloadData] the second time to show the empty view. I do this for paging demand.
When I find this，I debug it in view hierarchy and find the empty view added to tableView, but its position not correct. It lays far away below the edge of screen bottom.

To fix this, I change the following code. in function:

 void dzn_original_implementation(id self, SEL _cmd)

I exchanged the order of

[self dzn_reloadEmptyDataSet]; `

and

 if (impPointer) {
        ((void(*)(id,SEL))impPointer)(self,_cmd);
    }

That seems to solve the problem.
What I want to know is, did this change will cause some problem?
What is the original purpose of putting the original implementation after the injection?
What I know is, we often put our implementation after original or super implementation.

Thanks in advance...

[dzenbot]

What version of the library are you using? In wich OS and devices does this happen?

[zentraedi]

Last version fixed issues for me!

Thanks.

[dzenbot]

Great, thanks for the heads up @zentraedi!
@z0527z did you try latest version?

[z0527z]

of course its the latest 1.7 version, I update yesterday before I find the problem @dzenbot

[dzenbot]

@zentraedi reported the latest version fixed the issue for him, that why I asked.

[jhson114]

@dzenbot Hi, I ran into same issue. When reloadData is called after tableView has scrolled, the scrollView's contentSize does not reset by the time dzn_reloadEmptyDataSet is called. Therefore DZNEmptyDataSetView's frame.y is placed at the scrollView's last contentOffset. Switching the injection order as mentioned by @z0527z did fix the issue. Another fix was to reset the scrollView's contentSize in dzn_reloadEmptyDataSet. I'm using the latest version.

[rubenadlm]

I have the same problem when reloadData after tableView has scrolled.

[dzenbot]

I believe #182 should fix this issue.

[magnett]

I had it too with a collectionView. A quick & dirty fix is to call [self.collectionView setContentOffset:CGPointZero animated:NO]; right before the reload data.