iOS UITableView numberOfRowsInSection BAD ACCESS

Question

I'm calling the numberOfRowsInSection method of the UITableView delegate inside of the heightForRowAtIndexPath but it gives me a Bad Access Error:

- (CGFloat) tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
    ...
    NSLog(@"number of rows in section: %i", [tableView numberOfRowsInSection:[indexPath section]]);
    ...
}

Can anybody tell me whats wrong here?

You should show us what you do at `...` since this might be relevant. For example do you actually return a value. Not doing this might lead to BAD ACCESS too. — Besi, Dec 17 '12 at 10:47
ca u check this question http://stackoverflow.com/questions/31667986/ios-uitableview-numberofrowsinsection-in-tableview-heightforrowatindexpath-give — Nischal Hada, Jul 28 '15 at 05:28

score 2 · Answer 1 · answered Dec 17 '12 at 10:46

2

You are calling an delegate method.

When you call this method, it'll invoke the related delegates method like cellForRowAtIndexPath, heightForRowAtIndexPath etc.

It'll cause an infinite loop that's why it's crashing.

answered Dec 17 '12 at 10:46

Midhun MP

103,496
31
153
200

ca u check this question http://stackoverflow.com/questions/31667986/ios-uitableview-numberofrowsinsection-in-tableview-heightforrowatindexpath-give – Nischal Hada Jul 28 '15 at 05:28

score 1 · Answer 2 · answered Dec 17 '12 at 10:45

1

That's normal.. In that moment your UITableView is being created. You shouldn't call methods related to your UITableView, before it has been build. You should rely in other mechanism to get the height of your Cells.

answered Dec 17 '12 at 10:45

Rui Peres

25,741
9
87
137

ca u check this question http://stackoverflow.com/questions/31667986/ios-uitableview-numberofrowsinsection-in-tableview-heightforrowatindexpath-give – Nischal Hada Jul 28 '15 at 05:36

score 1 · Accepted Answer · answered Dec 17 '12 at 10:51

1

You need to return an actual value here. So instead of calling [tableView numberOfRowsInSection:[indexPath section]] simply do the same thing again.

In order not to duplicate your code you could create a helper method which you can call in both places, namely, your heightForRowAtIndexPath method and the numberOfRowsInSection method:

- (int) myNumberOfRowsMethod{
    // Here you would usually have some underlying model 
    return [self.myContactsOrWhateverArray count];
}

answered Dec 17 '12 at 10:51

Besi

22,579
24
131
223

ca u check this question http://stackoverflow.com/questions/31667986/ios-uitableview-numberofrowsinsection-in-tableview-heightforrowatindexpath-give – Nischal Hada Jul 28 '15 at 05:28

score 0 · Answer 4 · answered Dec 17 '12 at 10:49

0

You are calling

[tableView numberOfRowsInSection:section];

You should be calling

[self numberOfRowsInSection:section];

answered Dec 17 '12 at 10:49

Fogmeister

76,236
42
207
306

Again with the downvote and no comment!? This works and is a hell of a lot easier than the selected answer. Oh well. – Fogmeister Dec 17 '12 at 11:43
Yeah. This works and I don't know what's with the downvote. I was calling `[self.tableView numberOfRowsInSection: section];` and using `[self tableView: self.tableView numberOfRowsInSection: section];` solved the problem. Thanks :) – sleighty Jun 11 '15 at 04:34

iOS UITableView numberOfRowsInSection BAD ACCESS

4 Answers4

Linked