Xcode - Segue - Pass Variable From Cell class to TableViewController class - objective-c

Question

I'm struggling to pass a variable from one class to another. I've done some reading and the Segue method seems the most appropriate for me, I just can't get it to work. A little help would be greatly appreciated.
I have a UITableView (TableViewController1), which contains a cell (Cell1), which contains a label (ReferenceLabel 1). Table 1 is populated from an array; each cell contains a reference number (contained within ReferenceLabelLabel 1). The reference number from the selected cell needs to be passed to TableViewController2.
What I have so far:
TableViewController1.h
#import <UIKit/UIKit.h>
#define kGETUrl #"http://localhost/RC.php"
#interface TableViewController : UITableViewController {
NSMutableArray *json;
}
#end
TableViewController1.m
#import "TableViewController1.h"
#import "TableViewController2.h"
#import "TableViewCell1.h"
#interface TableViewController1 ()
#end
#implementation TableViewController1
- (id)initWithStyle:(UITableViewStyle)style {
self = [super initWithStyle:style];
if (self) {
}
return self;
}
- (void) getData:(NSData *) data {
json = [NSJSONSerialization JSONObjectWithData:data options:kNilOptions error:nil];
[self.tableView reloadData];
}
- (void) start {
NSURL *url = [NSURL URLWithString:kGETUrl];
NSData *data = [NSData dataWithContentsOfURL:url];
[self getData:data];
}
#pragma mark - View Lifecycle
- (void)viewDidLoad {
[super viewDidLoad];
[self start];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
#pragma mark - Table view data source
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
// Return the number of rows in the section.
return [json count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"TableViewCell1";
TableViewCell1 *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
if (cell == nil) {
cell = [[TableViewCell1 alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}
NSDictionary *info = [json objectAtIndex:indexPath.row];
cell.ReferenceLabel1.text = [info objectForKey:#"id"];
return cell;
}
//I'm stuck with the following... any help appreciate... i cant figure how to send the selected row's ReferenceLabel.text value
-(void)TableViewController1:(UITableView *)TableViewController1 didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[self performSegueWithIdentifier:#"TVC1RefNumberTVC2" sender:self];
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([[segue identifier] isEqualToString:#"TVC1RefNumberTVC2"])
{
NSIndexPath *ip = [self.tableView indexPathForSelectedRow];
DetailObject *detail = [self detailForIndexPath:path];
[segue.destinationViewController setDetail:detail];
}
}
#end
As for TableViewController2, I'm guessing I simply need to create a property for the variable I'm sending from TableViewController1?

Answer 1

You're right that you need to declare a property in your second view controller so that you can access it from your first view controller's prepareForSegue method.
You can declare a property in TableViewController2's header file that looks something like this:
#property (nonatomic, strong) DetailObject *detail;
And then set its detail property within the if clause within your TableViewController1's prepareForSegue method like this:
TableViewController2 *tableViewController2 = segue.destinationViewController
tableViewController2.detail = detail;
You can also add an additional check before casting the segue.destinationViewController by checking if the destinationVC's class matches that of TableViewController2.