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POUITableView scrollToRowAtIndexPath only scrolls sometimes
 

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  1. POUITableView scrollToRowAtIndexPath only scrolls sometimes
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    <p>I have a UITableView with several UITableViewCells and inside these cells are UITextFields. I implemented a UIToolbar for switching between the different textfields. I can go to the next textfield in the next cell or to the previous textfield. This works fine until a cell should become first responder which is currently not visible in the tableview.</p> <p>I figured out that </p> <pre><code>[self.tableview cellForRowAtIndexPath:indexPath] </code></pre> <p>returns <code>nil</code> and that manually scrolling to the cell with the textfield, which should become first responder, removes the problem. Therefore I tried scrolling to the cell before changing it to become first responder.</p> <p>I tried that with </p> <pre><code>[[self.tableView scrollToRowAtIndexPath:newIndexPath atScrollPosition:UITableViewScrollPositionBottom animated:YES]; </code></pre> <p>but unfortunately the tableview does not scroll to this cell but to all other cells. When I add a breakpoint to this line the problem doesn't occur. It also looks like the tableview is scrolling to the cell but then scrolls down again. </p> <p>Here is the code of cellForRowAtIndexPath:</p> <pre><code>UITableViewCell *cell; static NSString *AttributeCellIdentifier = @"AttributeCellIdentifier"; cell = [tableView dequeueReusableCellWithIdentifier:AttributeCellIdentifier]; if (cell == nil) { [[NSBundle mainBundle] loadNibNamed:@"AttributeCell" owner:self options:nil]; cell = attributeCell; self.attributeCell = nil; UITextField * textField = (UITextField *)[cell viewWithTag:1]; [textField setKeyboardType:UIKeyboardTypeDecimalPad]; [textField setInputAccessoryView:[self inputAccessoryView]]; } UITextField * textField; textField = (UITextField *)[cell viewWithTag:1]; textField.placeholder = @"C(Probe)/mol/l"; return cell; </code></pre> <p>Here is the code for switching to the previous textfield:</p> <pre><code>UIView * currentResponder = [self.view findFirstResonder]; UITextField * newFocusTextField; UITableViewCell * cell = (UITableViewCell*)[[currentResponder superview] superview]; NSIndexPath* indexPath = [self.tableView indexPathForCell:cell]; newFocusTextField = (UITextField*)[[self.tableView cellForRowAtIndexPath:[NSIndexPath indexPathForRow:1 inSection:0]] viewWithTag:1]; [currentResponder resignFirstResponder]; [newFocusTextField becomeFirstResponder]; UITableViewCell * newCell = (UITableViewCell*)[[newFocusTextField superview] superview]; NSIndexPath * newIndexPath = [self.tableView indexPathForCell:newCell]; [self.tableView scrollToRowAtIndexPath:newIndexPath atScrollPosition:UITableViewScrollPositionBottom animated:YES]; </code></pre> <p>Hope this helps.</p>
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    1. USKai O
    1. USKai O
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    1. COPlease post the code for cellForRowAtIndexPath. Did you write the contents of this method? If so, why is it returning nil? If not, why not?
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      1. USRayfleck
    2. COI wrote that code and i think it returns nil because the cell is not visible when scrolling doesn't work. From the Documentation for cellForRowAtIndexPath: An object representing a cell of the table or nil if the cell is not visible or indexPath is out of range.
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      1. USKai O
    3. COWhen you tap the toolbar to expose/edit the text field, how does it accomplish that? I'm wondering if there is an ordering problem here, i.e. you might need to scroll the table to expose the cell first, and then make it first responder.
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