Segue Won't Pass Data Onto TableView - ios

Question

I am trying to set an array in another view controller, named BillTrackerViewController, to the values of an NSMutableArray called billtrackertablevalues, located in the main class, MainViewController. I intend to use the array in BillTrackerViewController as data for the UITableView there. However, when I try to set the value of that array, table_items, and segue, the table doesn't show anything. However, the value of billtrackertablevalues is properly filled, and is NOT null.
Here is my code for MainViewController:
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
if([segue.identifier isEqualToString:#"toBillTracker"]) {
PFQuery *query = [PFQuery queryWithClassName:#"Resolution"];
[query whereKey:#"event" equalTo:event_name_label.text];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (!error) {
for (PFObject *object in objects) {
[billtrackertablevalues addObject:[NSString stringWithFormat:#"%#\nPro: %#\nCon: %#\nResult: %#",[object objectForKey:#"resolution_name"], [object objectForKey:#"resolution_pro_speaker"], [object objectForKey:#"resolution_con_speaker"], [object objectForKey:#"resolution_result_id"]]];
}
NSLog(#"%#", billtrackertablevalues);
} else {
NSLog(#"Error: %# %#", error, [error userInfo]);
}
}];
BillTrackerViewController *controller=(BillTrackerViewController *)segue.destinationViewController;
controller.table_items = [[NSMutableArray alloc] init];
controller.table_items = billtrackertablevalues;
}
}
And here is my code for BillTrackerViewController:
#import "BillTrackerViewController.h"
#import "Parse/Parse.h"
#interface BillTrackerViewController ()
#end
#implementation BillTrackerViewController
#synthesize billView;
#synthesize refreshButton;
#synthesize table_items;
- (void)viewDidLoad
{
[super viewDidLoad];
[billView reloadData];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) { }
return self;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
return [table_items count];
}
- (UITableViewCell *)tableView:(UITableView*)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"MainCell"];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:#"MainCell"];
}
NSString *cellText = table_items[indexPath.row];
cell.textLabel.text = cellText;
return cell;
}
#end
Once again, the table on BillTrackerViewController doesn't load values, but my initial array, billtrackertablevalues, is filled.
Thanks in advance, guys!

Answer 1

I think you need to move the lines instantiating controller, and setting its property to inside the block method:
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{
if([segue.identifier isEqualToString:#"toBillTracker"]) {
PFQuery *query = [PFQuery queryWithClassName:#"Resolution"];
[query whereKey:#"event" equalTo:event_name_label.text];
[query findObjectsInBackgroundWithBlock:^(NSArray *objects, NSError *error) {
if (!error) {
for (PFObject *object in objects) {
[billtrackertablevalues addObject:[NSString stringWithFormat:#"%#\nPro: %#\nCon: %#\nResult: %#",[object objectForKey:#"resolution_name"], [object objectForKey:#"resolution_pro_speaker"], [object objectForKey:#"resolution_con_speaker"], [object objectForKey:#"resolution_result_id"]]];
}
NSLog(#"%#", billtrackertablevalues);
BillTrackerViewController *controller=(BillTrackerViewController *)segue.destinationViewController;
controller.table_items = billtrackertablevalues;
} else {
NSLog(#"Error: %# %#", error, [error userInfo]);
}
}];
}
}
After Edit:
There is still a timing issue because the segue happens before the block returns, so you should override the setter for table_items in the BillTrackerViewController. The segue will still occur first (you might want to put a spinner in your view so the user knows something is happening), and then when the block finishes, the setter will be called:
-(void)setTable_items:(NSString *)table_items {
_table_items = table_items;
//update your table here.
}

Answer 2

How about this:
controller.table_items = [[NSMutableArray alloc] initWithArray:billtrackertablevalues];
Also the problem might be in the BillTrackerViewController itself