cellForRowAtIndexPath: not called by reloaddata - ios

Question

I know it's a commom problem but the cellForRowAtIndexPath: is not called when I use [actionTableView reloadData];. I already linked dataSource and delegate thanks to the storyboard but it doesn't solve the issue.
Here's a part of my code:
SearchViewController.h
#import <UIKit/UIKit.h>
#interface SearchViewController : UIViewController <UITableViewDelegate, UITableViewDataSource, UISearchBarDelegate, UISearchDisplayDelegate>
#property (strong, nonatomic) IBOutlet UITableView *actionTableView;
#property (strong, nonatomic) IBOutlet UISearchBar *actionSearchBar;
#property (strong, nonatomic) NSMutableArray *actionsArray;
#property (strong, nonatomic) NSMutableArray *filteredActionArray;
#end
SearchViewController.m
#import "SearchViewController.h"
#import "Action.h"
#interface SearchViewController ()
#end
#implementation SearchViewController
#synthesize actionsArray, actionTableView, filteredActionArray, actionSearchBar;
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView {
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
if (tableView == self.searchDisplayController.searchResultsTableView) {
return [filteredActionArray count];
} else {
return [actionsArray count];
}
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if ( cell == nil ) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
}
NSLog(#"Aloha");
// Create a new Action object
Action *a = nil;
if (tableView == self.searchDisplayController.searchResultsTableView) {
a = [filteredActionArray objectAtIndex:indexPath.row];
} else {
a = [actionsArray objectAtIndex:indexPath.row];
}
// Configure the cell
cell.textLabel.text = a.nomAction;
[cell setAccessoryType:UITableViewCellAccessoryDisclosureIndicator];
return cell;
}
-(void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope {
// Update the filtered array based on the search text and scope.
// Remove all objects from the filtered search array
[self.filteredActionArray removeAllObjects];
// Filter the array using NSPredicate
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"SELF.nomAction contains[c] %#",searchText];
filteredActionArray = [NSMutableArray arrayWithArray:[actionsArray filteredArrayUsingPredicate:predicate]];
}
-(BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString {
// Tells the table data source to reload when text changes
[self filterContentForSearchText:searchString scope:
[[self.searchDisplayController.searchBar scopeButtonTitles]objectAtIndex:[self.searchDisplayController.searchBar selectedScopeButtonIndex]]];
// Return YES to cause the search result table view to be reloaded.
return YES;
}
-(BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchScope:(NSInteger)searchOption {
// Tells the table data source to reload when scope bar selection changes
[self filterContentForSearchText:self.searchDisplayController.searchBar.text scope:
[[self.searchDisplayController.searchBar scopeButtonTitles] objectAtIndex:searchOption]];
// Return YES to cause the search result table view to be reloaded.
return YES;
}
As you see I also use a searchBar to filter the array, but w/o this it doesn't work either.
EDIT: SPECIFICATION OF THE PROBLEM: reloadData works only if I call it within the viewController. Not if I call it from another viewController. Obviously for the two cases I call the same function updatingTableView located in the viewcontroller where the tableView is. Any ideas to reload the tableView from anotherViewController?
SearchViewController.m (works)
-(IBAction)update{
[self updatingTableView:nil];
}
-(void)updatingTableView:(NSData*)someData {
actionsArray = [NSArray arrayWithObjects:#"item1", #"item2", #"item3", nil];
[actionTableView reloadData];
}
AnotherViewController.m (does not work)
-(IBAction)updateFromElsewhere{
UIStoryboard *mainStoryboard = [UIStoryboard storyboardWithName:#"Main"
bundle: nil];
SearchViewController *searchViewController = (SearchViewController*) [mainStoryboard
instantiateViewControllerWithIdentifier: #"searchcontroller_id"];
[searchViewController updatingTableView:nil];
}
NB: I can pass some data from a view controller to the other without problem here.

Answer 1

One thing I always run into when struggle up a table view is connecting the table with the interface using interface builder. But when you call [actionTableView reloadData] without having the connection made to the table, nothing will happen.
I ways forget that super simple step. Hope this helped

Answer 2

The problem is you never initialize actionsArray and filteredActionArray to be non-nil. As a result, numberOfRowsInSection always returns 0, so cellForRowAtIndexPath won't be called.

Answer 3

Finally found the solution!
In SearchViewController.m where the tableView is, put this in viewDidLoad
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(updatingTableView) name:#"reload_data" object:nil];
With still:
-(void)updatingTableView{
[actionTableView reloadData];
}
In AnotherViewController.m
[[NSNotificationCenter defaultCenter] postNotificationName:#"reload_data" object:self];
how to reload tableview of another uiviewcontroller in current viewcontroller
Thanks everyone!