How to transition from UITableViewCell to another view controller

Question

I am trying to go from a UITableView with prototype cells to a detailviewcontroller of the item I selected on.

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if([segue.identifier isEqualToString:@"historyToDetail"])
    {
        BYFHistoryDetailViewController *controller = (BYFHistoryDetailViewController    *)segue.destinationViewController;
        controller.workOut = [[BYFWorkOut alloc] init];
        controller.workOut=_selectRow;
    }
}


-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    BYFHistoryTableViewController *detailViewController =[[BYFHistoryTableViewController alloc] init];

    NSArray *items = [[BYFworkOutStore sharedStore] allItems];
    BYFWorkOut *selectedItem = items[indexPath.row];
    _selectRow = selectedItem;
}

What is not happening is the transition from the table to detail I have a push segue from the prototype cell to the details.

What am I missing?

Answer 1

You are doing quite a lot wrong here. When using segue's you don't create an instance of the class. You simply call:

[self performSegueWithIdentifier:@"MySegue" sender:self];

This will use the segue you have defined in the storyboard. Where MySegue is the segue ID you created.

When you want to pass in data you use the callback

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    BYFHistoryDetailViewController *vc = (BYFHistoryDetailViewController *)[segue destinationViewController];
    vc.workOut = selectedItem;
}

But using this callback will mean you will need to store selectedItem somewhere after you click the row so you can access it here.

EDIT

Your code seems a bit odd here also.

You set workout to a new object.

detailViewController.workOut = [[BYFWorkOut alloc]init];

Create another object from data.

NSArray *items = [[BYFworkOutStore sharedStore] allItems];
BYFWorkOut *selectedItem = items[indexPath.row];

And then assign the new object, overwriting the previous one.

//give detail view controller a pointer to the item object in row
detailViewController.workOut = selectedItem;

There is no need to have the first line of code at all

EDIT 2

If you only going to be using the one selected item at a time. you can do this in your UITableViewController class.

@implementation MyTableViewControllerClass
{
    BYFWorkOut *_selectedItem;
}

inside didSelectRowAtIndexPath:

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
   NSArray *items = [[BYFworkOutStore sharedStore] allItems];
   _selectedItem = items[indexPath.row];
}

---

---

EDIT 3

I've modified the code you posted here. You didn't add the first line of code i posted. Please look at this:

-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
    if([segue.identifier isEqualToString:@"historyToDetail"])
    {
        BYFHistoryDetailViewController *controller = (BYFHistoryDetailViewController    *)segue.destinationViewController;
        controller.workOut = _selectRow;
    }
}


-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSArray *items = [[BYFworkOutStore sharedStore] allItems];
    _selectRow = items[indexPath.row];

   [self performSegueWithIdentifier:@"historyToDetail" sender:self];
}

Answer 2

You need to name your segue and call the method:

[self performSegueWithIdentifier:@"MySegue" sender:self];