How to pass data values to other ViewController Objective-C using NSDictionary? - ios

Question

I'm following a tutorial from a book and everything went fine untill i had to recieve the data from the tableView, i must mention that i modified some of the basic tutorial to fit my needs as i work with JSON values comming from a API. It crashes when i reference the value using self and says that the variables is nil. must also mention that the label has been added as a reference outlet and the customClass also as been created and added referenced with the View. Aditional to this added properly Segue to the detailViewController
UserDetailViewController.h
#interface UserDetailViewController : UIViewController
#property (nonatomic, strong) NSString *labelName;
#property (nonatomic, strong) IBOutlet UILabel *detailLabelName;
#end
UserDetailViewController.m
This is the code that does the transition between Table and detailView but there are a few values that does not belong to the code i have such as recipeName and recipeNames as you can see below:
recipeName is on my code labelName
recipeNames is on my code a dictionary [dictionary objectForKey:#"name"]
and have no idea how to put this part together. :(
// Here is where I handles the Data Transfer
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:#"userDetailView"])
{
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
RecipeDetailViewController *destViewController = segue.destinationViewController;
destViewController.recipeName = [recipeNames objectAtIndex:indexPath.row];
}
}

Answer 1

According to my understanding, you want to set text for detailLbelName depending on labelName. And this value is coming from your parent view controller.
You must be doing something like this:
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {
UserDetailViewController *detailController = [[UserDetailViewController alloc]initWithNibName:#"UserDetailViewController" bundle:nil];
self.detailController.lableName = #"Your Text According to Cell"
[self.navigationController pushViewController:detailController animated:YES];
}
In your UserDetailViewController:
- (void)viewWillAppear
{
self.title = self.labelName;
[self.detailLabelName setText:self.labelName];
}

Answer 2

To receive the data from tableView need to handle tableView delegate did select method and passed all required data to detailLabelName then refresh the screen.

Answer 3

Move the assignment lines in viewDidLoad to viewWillAppear.
- (void)viewWillAppear
{
self.title = self.labelName;
_detailLabelName.text = _labelName; // this is the breakpoint
}
Then, hwever you are storing the string in the table view (i assume you mean the cells specifically) then you may assign the value extracted from the table view cell after creating the detail view controller but before it is pushed onto the navigation stack and crashes your app.

Answer 4

please try this
In
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
of your table view do this.
UserDetailViewController *detailsView = [[UserDetailViewController alloc] initWithNibName:"Your nib name" bundle:[NSBundle mainBundle]];
UITableViewCell *reqDcell = [tableView cellForRowAtIndexPath:indexPath];
detailsView.labelName = //Text from reqDcell goes here. In particular the recipe name
[self.navigationController pushViewController:tableViewControls animated:YES];
Hope this helps.
********** EDIT ************
Ok so inorder to pass values using a dictionary , you would need an array of dictionaries which hold your data.
In terms of the link you posted, i have modified it for your understanding to use dictionaries.
recipeNames = #[[NSDictionary dictionaryWithObject:#"Mushroom" forKey:#"Recipie Name"],
[NSDictionary dictionaryWithObject:#"Hamburger" forKey:#"Recipie Name"],
[NSDictionary dictionaryWithObject:#"Pasta" forKey:#"Recipie Name"],
[NSDictionary dictionaryWithObject:#"Pizza" forKey:#"Recipie Name"],
[NSDictionary dictionaryWithObject:#"Noodles" forKey:#"Recipie Name"]];
The dictionary here will hold the json data that you have.
in - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
// Display recipe in the table cell
NSDictionary *dict = [recipeNames objectAtIndex:indexPath.row];
cell.nameLabel.text = [dict valueForKey:#"Recipie Name"];
and the prepareForSegue function.
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if ([segue.identifier isEqualToString:#"showRecipeDetail"]) {
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
RecipeDetailViewController *destViewController = segue.destinationViewController;
NSDictionary *dict = [recipeNames objectAtIndex:indexPath.row];
destViewController.recipeName = [dict valueForKey:#"Recipie Name"];
}
}
I hope this is helpful