Refresh View Controller after calling dismissViewControllerAnimated from View Controller - ios

Question

What is the most appropriate method for reloading my view controller?
To expand upon the scenario, I have a UITableView having populated cells within a View Controller.
I create new cells by transitioning to a new "Create Cell" view controller, however when I call the dismissViewControllerAnimated function, the new cell does not appear.
I cannot use a segue as the initial view controller is a component of a tab bar view controller, so the tab bar disappears if I segue from the "Create Cell" view controller.
Then how can I reload the view, upon a successful dismissal of the "Create Cell" view controller?
Thanks in advance.
Code, in question, that needs refreshing (Implemented the non-working notification method):
#interface MyListings ()
#property (weak, nonatomic) IBOutlet UIButton *createListingButton;
#property (weak, nonatomic) IBOutlet UITableView *tableView;
#property (strong, nonatomic) ListingModel *listItem;
#property (strong, nonatomic) UserModel *usr;
#end
#implementation MyListings
- (void)viewDidLoad
{
[super viewDidLoad];
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(newCellCreated:)
name:#"newCellCreated"
object:nil];
self.listItem = [[ListingModel alloc] init];
self.usr = [[UserModel alloc]init];
NSDate *currentDateTime = [NSDate date];
FIRUser *user = [FIRAuth auth].currentUser;
if ([self.usr getDataForUser:user.email])
{
if ([self.listItem getDataForUser:[NSString stringWithFormat:#"%d", self.usr.user_id]])
{
NSLog(#"Got listings");
};
}
titles = self.listItem.title;
currentBids = self.listItem.starting_bid;
stillAvailables = self.listItem.timer;
listingIDs = self.listItem.listing_id;
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc]init];
[dateFormatter setDateFormat:#"YYYY/MM/dd"];
for(int idx = 0; idx < [self.listItem.listing_id count]; idx++)
{
NSDate *d1 = [dateFormatter dateFromString:self.listItem.timer[idx]];
if([d1 compare:currentDateTime] == NSOrderedDescending)
{
stillAvailables[idx] = #"Expired";
}
else
{
stillAvailables[idx] = #"Available";
}
}
_createListingButton.layer.cornerRadius = 8;
_createListingButton.layer.borderWidth = 1.5f;
_createListingButton.layer.borderColor = [UIColor whiteColor].CGColor;
[_createListingButton addTarget:self action:#selector(createListingButtonHighlightBorder) forControlEvents:UIControlEventTouchDown];
[_createListingButton addTarget:self action:#selector(createListingButtonUnhighlightBorder) forControlEvents:UIControlEventTouchUpInside];
[_createListingButton addTarget:self action:#selector(createListingButtonUnhighlightBorder) forControlEvents:UIControlEventTouchDragExit];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
}
- (UIStatusBarStyle)preferredStatusBarStyle
{
return UIStatusBarStyleLightContent;
}
- (void) newCellCreated:(NSNotification *) notification
{
if ([[notification name] isEqualToString:#"newCellCreated"])
[self.tableView reloadData];
}
- (void)createListingButtonHighlightBorder
{
_createListingButton.layer.borderColor = [UIColor colorWithRed:0.61 green:0.00 blue:0.02 alpha:1.0].CGColor;
}
- (void)createListingButtonUnhighlightBorder
{
_createListingButton.layer.borderColor = [UIColor whiteColor].CGColor;
}
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return titles.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
MyListingsTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:#"MyListingsTableViewCell"];
[cell updateCellWithTitle:[titles objectAtIndex:indexPath.row] currentBid:[currentBids objectAtIndex:indexPath.row] stillAvailable:[stillAvailables objectAtIndex:indexPath.row] listingID:[listingIDs objectAtIndex:indexPath.row]];
cell.backgroundColor = [UIColor clearColor];
return cell;
}
- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
[self performSegueWithIdentifier:#"editListing" sender:self];
}
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:#"editListing"])
{
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
EditListing *destController = segue.destinationViewController;
destController.listId = self.listItem.listing_id[indexPath.row];
}
}

Answer 1

You can have notification or delegate methods.
As you didn't post any piece of code, replace the names as your convenience.
I'll give you a short example using notification.
In your TableViewController:
override func viewDidLoad() {
super.viewDidLoad()
NotificationCenter.default.addObserver(forName: NSNotification.Name(rawValue: "newCellCreated"), object: nil, queue: nil) { (notification) in
self.tableView.reloadData()
}
}
In your CreateCellViewController:
func closeView() {
self.dismiss(animated: true) {
NotificationCenter.default.post(NSNotification.Name(rawValue: "newCellCreated"))
}
}
EDIT - Objective C version
In your TableViewController:
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[[NSNotificationCenter defaultCenter] addObserver:self
selector:#selector(newCellCreated:)
name:#"newCellCreated"
object:nil];
}
- (void) newCellCreated:(NSNotification *) notification
{
if ([[notification name] isEqualToString:#"newCellCreated"])
[self.tableView reloadData];
}
In your CreateCellViewController:
-(void) closeView {
[self dismissViewControllerAnimated:NO completion:^{
[[NSNotificationCenter defaultCenter]
postNotificationName:#"newCellCreated"
object:self];
}];
}