viewWillAppear is not executing - ios

Question

I have a tableview loaded withe records, see the code below:
- (void)viewDidLoad
{
self.navigationItem.title=#"Accounts";
// NSString *accountFile = [[NSBundle mainBundle] pathForResource:#"Accounts2" ofType:#"plist"];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentPath = [paths objectAtIndex:0];
NSString *plistPath = [documentPath stringByAppendingPathComponent:#"Accounts2.plist"];
accounts = [[NSMutableDictionary alloc] initWithContentsOfFile:plistPath];
NSLog(#"Accounts contains : %#", accounts);
account = [accounts objectForKey:#"Account"];
NSLog(#"account %#", account);
number = [accounts objectForKey:#"Number"];
dueDay = [accounts objectForKey:#"DayDue"];
minAmount = [accounts objectForKey:#"MinAmount"];
balance = [accounts objectForKey:#"Balance"];
NSLog(#"data loaded");
[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;
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)insertNewObject:(id)sender
{
// if (!_objects) {
// _objects = [[NSMutableArray alloc] init];
// }
// [_objects insertObject:[NSDate date] atIndex:0];
// NSIndexPath *indexPath = [NSIndexPath indexPathForRow:0 inSection:0];
// [self.tableView insertRowsAtIndexPaths:#[indexPath] withRowAnimation:UITableViewRowAnimationAutomatic];
if (!self.addView) {
self.addView = [[AddView alloc] initWithNibName:#"AddView" bundle:nil];
}
[self.navigationController pushViewController:self.addView animated:YES];
NSLog(#"I am done, now what");
}
#pragma mark - Table View
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
NSLog(#"Number of records is %d", [account count]);
return [account count];
}
// Customize the appearance of table view cells.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
}
NSDate *object = _objects[indexPath.row];
cell.textLabel.text = [object description];
NSString *nameOfAccount = [account objectAtIndex:indexPath.row];
cell.textLabel.text = nameOfAccount;
NSString *accountNumber = [number objectAtIndex:indexPath.row];
cell.detailTextLabel.text = accountNumber;
NSLog(#"Index %d", indexPath.row);
return cell;
}
I want to add a record to table, so I use the "InsertNewObject" method ... new screen appears, I am able to add the record to my plist, and then I execute the following line in the DetailView to return:
[self.navigationController popToRootViewControllerAnimated:NO];
Now, I want to reload my TableView with my new record:
I thought I just had to have the following viewWillAppear method like below:
- (void) viewWillAppear {
NSLog(#"View will appear");
[super viewWillAppear:YES];
[self.tableView reloadData];
}
but, my NSLog is never executed, therefore my program is never getting here... am I doing something incorrectly, thank you for any response
I have added the following two methods:
- (void) navigationController:(UINavigationController *) navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated{
[self.tableView reloadData];
}
-(void) navigationController:(UINavigationController *) navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated{
[self.tableView reloadData];
}
and changed the line
[self.navigationController popToRootViewControllerAnimated:YES];
still not working, is something still wrong.

Answer 1

You are not using the correct method. You are leaving out the animated argument, try using -(void)viewWillAppear:(BOOL)animated:
See UIViewController - viewWillAppear:
- (void)viewWillAppear:(BOOL)animated {
NSLog(#"View will appear");
[self.tableView reloadData];
[super viewWillAppear:animated];
}

Answer 2

if you are using a nav controller I belive the correct way to reload a view would be to call somethihng like this
-(void) viewWillAppear: (BOOL) animated
{
[self.tableView reloadData];
}
You could also create your own custom reloadData method that sets what you want changed and then call that method.

Answer 3

As pointed out, viewWillAppear takes an animated argument. However, even when you add that, popping a view controller off the navigation stack does not trigger a call to viewWillAppear:. You need to use UINavigationControllerDelegate's navigationController:willShowViewController:animated: and navigationController:didShowViewController:animated: methods to reload your table view.