How to insert values into a UITableViewCell from another view controller - ios

Question

I have a UITableView with 10 cells in it. I have a UIButton & UILabel inside all the 10 cells. Now if I select a UIButton in the 2nd cell, I will navigate to another page and select some values (string values). Now, I want that string to be placed in the UILabel of 2nd cell. Likewise, if i select the UIButton on 5th cell, I will navigate to another page, select some string and that string has to be placed in the UILabel of the 5th cell. How do I insert the values inside the UILabel of that particular cell.
Ideas are appreciated.

Answer 1

I'd recommend setting that second view controller to contain an instance of the first so you can then manipulate the first view controller's data array from that second view.
For example, in the section of the FirstViewController where you create the SecondViewController to perform the push (since as you said in the comments, you're pushing the view controller using a UINavigationController), also make the SecondViewController contain an instance of the FirstViewController.
FirstViewController .m:
// Method to handle the push transition
- (void)buttonPressed:(UIButton*)button {
// Set the view controller's `selectedRow` property
// to contain the selected row number as contained in
// the button tag in this particular scenario
self.selectedRow = (int)button.tag;
// Create an instance of SecondViewController
SecondViewController *secondViewController = [[SecondViewController alloc] initWithNibName:#"SecondViewController" bundle:nil];
// Pass the view controller along by setting
// the secondViewController's firstViewController
// property to contain self, i.e. the current
// instance of the FirstViewController
secondViewController.firstViewController = self;
// Push to the SecondViewController
[self.navigationController pushViewController:secondViewController animated:YES];
}
And in the .h of SecondViewController, add the firstViewController property such that it's publicly accessible from the FirstViewController.
SecondViewController .h:
#import "FirstViewController.h"
#interface SecondViewController : UIViewController
#property (weak, nonatomic) FirstViewController *firstViewController;
Then in the .m of SecondViewController, you can manipulate the array acting as your table's data source in FirstViewController as needed, before popping the view.
SecondViewController .m:
// Method called after the string is selected
- (void)stringSelected:(NSString*)string {
// Update the array to contain the string
// (or do whatever manipulation to whatever data
// structure is fitting in your particular case)
[self.firstViewController.array replaceObjectAtIndex:self.firstViewController.selectedRow withObject:string];
// To go back to the previous view, pop the view controller
[self.navigationController popViewControllerAnimated:YES];
}
Also, you'll want the UITableView's data source array and selectedRow property to be contained in the .h of FirstViewController so it's publicly accessible from SecondViewController.
FirstViewController .h:
#property (weak, nonatomic) NSMutableArray *array;
#property (nonatomic) int selectedRow;
And in the .m of FirstViewController you want to make sure to reload the table data upon return from the other view so the UITableView reflects the updated data.
FirstViewController .m:
- (void)viewWillAppear:(BOOL)animated {
[self.table reloadData];
}

Answer 2

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
CustomTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"CellName" forIndexPath:indexPath];
if(cell == nil)
{
cell = [[CustomTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"CellName"];
}
//Assigning the contents of cell
cell.labelName.text = [NSString stringWithFormat:#"%#", [self.arrCategoryTitle objectAtIndex:indexPath.row]];
[cell.buttonName addTarget:self action:#selector(buttonNamePressed:) forControlEvents:UIControlEventTouchDown];
// Configure the cell...
return cell;
}
- (void)buttonNamePressed:(UIButton *)sender
{
CGPoint swipepoint = sender.center;
CGPoint rootViewPoint = [sender.superview convertPoint:swipepoint toView:self.tableName];
NSIndexPath *indexPath = [self.tableName indexPathForRowAtPoint:rootViewPoint];
NSLog(#"%#", indexPath);
[self.tableName cellForRowAtIndexPath:indexPath];
self.defaultRowId = indexPath.row;
[self performSegueWithIdentifier:#"viewControllerIdentifierName" sender:self];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
DetailsViewController *detailsViewController = (DetailsViewController *)[(UINavigationController *)segue.destinationViewController topViewController];
detailsViewController.defaultrow = self.defaultRowId;
}
Now when you navigate to the secondViewController, set the selecting string value to the property of the firstViewController then reload table.