TableView does not update when I pass a string from another view - objective-c

Question

I want to populate a UITableView by passing a string from a UIViewController to a UITableView.
This is my code so far:
UITableViewController.m
- (void)viewDidLoad
{
[super viewDidLoad];
NSMArray = [[NSMutableArray alloc]initWithObjects:#"text",#"text2", nil];
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return NSMArray.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
if (cell == nil){
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier ];
}
cell.textLabel.text = [NSMArray objectAtIndex:indexPath.row];
return cell;
}
- (BOOL)tableView:(UITableView *)tableView canEditRowAtIndexPath:(NSIndexPath *)indexPath
{
return YES;
}
- (void)tableView:(UITableView *)tableView commitEditingStyle:(UITableViewCellEditingStyle)editingStyle forRowAtIndexPath:(NSIndexPath *)indexPath
{
if (editingStyle == UITableViewCellEditingStyleDelete) {
//remove fron NSMutableArray
[NSMArray removeObjectAtIndex:indexPath.row];
//delete from table
[tableView deleteRowsAtIndexPaths:#[indexPath] withRowAnimation:UITableViewRowAnimationTop];
}
}
-(void)getString:(NSString *)string
{
if ([make length] > 0) {
if (!NSMArray)
{
NSMArray = [[NSMutableArray alloc]init];
}
[NSMArray insertObject:make atIndex:0];
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
[self.myTableView insertRowsAtIndexPaths:#[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
}
}
UITableViewController.h
#import <UIKit/UIKit.h>
#import "ViewController.h"
#interface ViewController : UIViewController <UITableViewDataSource, UITableViewDelegate>
#property (strong, nonatomic) IBOutlet UITableView *myTableView;
#property (strong, nonatomic) NSMutableArray *NSMArray;
-(void)getString:(NSString *)string;
ViewController.m
#import "entryViewController.h"
#interface entryViewController ()
#end
#implementation entryViewController
#synthesize textfieldString, myString;
- (void)viewDidLoad
{
[super viewDidLoad];
//Save button
UIBarButtonItem *SaveButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemSave target:self action:#selector(pushCarMake:)];
self.navigationItem.rightBarButtonItem = SaveButton;
}
- (void)pushCarMake:(id)sender
{
myString = textfieldString.text;
ViewController *mainVC = [[ViewController alloc]init];
[mainVC getString:myString];
//pop to root ViewController
[self.navigationController popToRootViewControllerAnimated:TRUE];
}
#end
ViewCotroller.h
#import <UIKit/UIKit.h>
#import "ViewController.h"
#interface entryViewController : UIViewController
#property (strong, nonatomic) NSString *carMake;
#property (strong, nonatomic) IBOutlet UITextField *textfieldCarMake;
So this works fine and populates the Table View with the string items instantiated in the viewDidLoad of the UITableViewCotroller. But every time I pass a string from the ViewControllers to the table View it does not go into the table. any suggestions why this is. Sorry for pasting so much code.

Answer 1

One approach for passing data from a detail view controller back to it's parent is using a delegate. Here's an example:
How do I set up a simple delegate to communicate between two view controllers?
[Edited]
The other approach if you're using storyboards is to use an unwind segue. Here's a sample I put together using this approach: github.com/soleares/AddToTableView

Answer 2

Not positive if this is the only issue, but try adding beginUpdates and endUpdate
[myTableView beginUpdates];
[self.myTableView insertRowsAtIndexPaths:#[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
[myTableView endUpdates];