How do I insert UITextField in to UITableView after button is pressed - objective-c

Question

In master view application xcode generates ready app with table view and the plus button. I want to change that button to to add a new cell but not with the date as it is by default. I want to add two text fields like label->textfield, label->textfield.
In code I have this:
- (void)viewDidLoad{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.navigationItem.leftBarButtonItem = self.editButtonItem;
UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:#selector(insertNewObject:)];
self.navigationItem.rightBarButtonItem = addButton;
self.detailViewController = (GCDetailViewController *) [[self.splitViewController.viewControllers lastObject] topViewController];
}
and the function:
- (void)insertNewObject:(id)sender{
if (!_objects) {
_objects = [[NSMutableArray alloc] init];
}
[_objects insertObject:[UITextField alloc] atIndex:0];
NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
[self.tableView insertRowsAtIndexPaths:#[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
Thank You

Answer 1

The way to think about this is model-view-controller (MVC). _objects is your model representing whatever the user thinks is in the table. Say it's a to-do list, then objects could be an array of NSObject subclass you create like TodoItem.
You would insert new TodoItems into _objects, then tell your table (the "View" in MVC) that it's model has changed. You can do that imprecisely using reloadData, or in a more targeted fashion as your code suggests, calling insertRowsAtIndexPaths - but that call must be sandwiched between tableView beginUpdates and endUpdates.
You can add textFields in code in your cellForRowAtIndexPath, or in the cell prototype in storyboard. Your table view datasource should always refer to objects... i.e. numberOfRows answers self.objects.count, cellForRowAtIndexPath gets:
TodoItem *item = [self.objects objectAtIndexPath:indexPath.row];
and uses that item's properties to initialize the textField's text. Also, incidentally, objects should be declared like this:
#property(strong,nonatomic) NSMutableArray *objects;
...and your code should refer to self.objects almost everywhere (not _objects). Initializing it on the first insert is too late, because the table needs it to be valid right-away, as soon as it's visible. Usually, a good practice is a "lazy" init replacing the synthesized getter...
- (NSMutableArray *)objects {
if (!_objects) { // this one of just a few places where you should refer directly to the _objects
_objects = [NSMutableArray array];
}
return _objects;
}

Answer 2

You might find using the free Sensible TableView framework really helpful here. Here is some sample code to illustrate how you'd do this using the framework:
- (void)insertNewObject:(id)sender{
SCTableViewSection *section = [self.tableViewModel sectionAtIndex:0];
[section addCell:[SCTextFieldCell cellWithText:#"Enter Text"]];
}
Comes in really handy for these types of situations.