无法在一个视图控制器中加载两个表视图

Question

Error:- use of un declared identifier cell.

unable to load two custom cells in one view controller.

-(UITableViewCell*)tableView:(UITableView*)tableView cellForRowAtIndexPath:(NSIndexPath*)indexPath
{
    if (tableView == tableView_grantRecordAccess)
    {
        UITableViewCell *cell = [tableView_grantRecordAccess dequeueReusableCellWithIdentifier:@"EHSRecordAccessGrantCell"];

           if (cell == nil) {

               // Load the top-level objects from the custom cell XIB.

                NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:@"EHSRecordAccessGrantCell" owner:self options:nil];

                // Grab a pointer to the first object (presumably the custom cell, as that's all the XIB should contain).

                cell = [topLevelObjects objectAtIndex:0];

            }

        return cell;

    }

 else if (tableView == tableView_accessRecordRequest)  {

        UITableViewCell *cell = [tableView_accessRecordRequest dequeueReusableCellWithIdentifier:@"EHSAccessRecordCell"];

        if (cell == nil) {

            // Load the top-level objects from the custom cell XIB.

            NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:@"EHSAccessRecordCell" owner:self options:nil];

            // Grab a pointer to the first object (presumably the custom cell, as that's all the XIB should contain).

            cell = [topLevelObjects objectAtIndex:0];
        }
            }

    return cell;

}

Answer 1

这是单元格引用的范围问题，如果您将在方法的第一行引用单元格，然后仅在两种情况下都使用该引用，则它将起作用。

Answer 2

-(UITableViewCell*)tableView:(UITableView*)tableView cellForRowAtIndexPath:(NSIndexPath*)indexPath
{
      UITableViewCell *cell = nil;
      if (tableView == tableView_grantRecordAccess)
      {
         cell = [tableView_grantRecordAccess dequeueReusableCellWithIdentifier:@"EHSRecordAccessGrantCell"];

         if (cell == nil) {

           // Load the top-level objects from the custom cell XIB.

            NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:@"EHSRecordAccessGrantCell" owner:self options:nil];

            // Grab a pointer to the first object (presumably the custom cell, as that's all the XIB should contain).

            cell = [topLevelObjects objectAtIndex:0];

        }

      return cell;

}
else if (tableView == tableView_accessRecordRequest)  {

    cell = [tableView_accessRecordRequest dequeueReusableCellWithIdentifier:@"EHSAccessRecordCell"];

    if (cell == nil) {

        // Load the top-level objects from the custom cell XIB.

        NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:@"EHSAccessRecordCell" owner:self options:nil];

        // Grab a pointer to the first object (presumably the custom cell, as that's all the XIB should contain).

        cell = [topLevelObjects objectAtIndex:0];
    }
  }
  return cell;

}

Answer 3

add this line above if condition respectively //if (cell == nil) { ... }

//For first table condition

if (![cell isKindOfClass:[EHSRecordAccessGrantCell
 class]])cell = nil;

//For second table condition

if (![cell isKindOfClass:[EHSAccessRecordCell
 class]])cell = nil;

crash because of you have register both cell to table and whenever it comes to second one the cell already have the reference of the second one cell that is differet typeof

Answer 4

Check in your storyboard for the right cell identifier.

Select both of your table's prototype cell's identifier in identity inspector.

Looking at your error statement, I can assume- You may have forgotten to assign the identifier to your cell or you are using wrong identifier(may be a spelling mistake) in your code(cellForRowAtIndexPath method).