UITableView with data from NSMutableArray returns empty - ios

Question

I want to fill the content of a TableView according to selections made in a PickerView view. The code I have so far is:
- (IBAction)findOwnerButtonPressed:(id)sender
{
findShip.hidden = NO;
shipOwners.hidden = NO;
boatsTableView.hidden = YES;
boatOwners = [NSArray arrayWithObjects:#"Owner1",#"Owner2",#"Owner3", nil];
}
- (IBAction)findShipButtonPressed:(id)sender
{
shipOwners.hidden = YES;
findShip.hidden = YES;
boatsTableView.hidden = NO;
}
PickerView Data Source
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 1;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
return [boatOwners count];
}
- (NSString *)pickerView:(UIPickerView *)pickerView
titleForRow:(NSInteger)row
forComponent:(NSInteger)component
{
return [boatOwners objectAtIndex:row];
}
PickerView Delegate
- (void)pickerView:(UIPickerView *)pickerView
didSelectRow:(NSInteger)row
inComponent:(NSInteger)component
{
NSString *boatsFromOwner = [boatOwners objectAtIndex:[shipOwners selectedRowInComponent:0]];
boatsForOwner = [NSMutableArray arrayWithObjects:nil];
if ([boatsFromOwner isEqualToString:#"Owner1"]) {
[self.boatsForOwner addObject:#"Titanic"];
}
NSLog(#"%#",boatsFromOwner);
}
TableView DataSource & Delegate
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return [boatsForOwner count];
}
- (UITableViewCell *)tableView:(UITableView *)tableView
cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *simpleTableIdentifier = #"SimpleTableItem";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:simpleTableIdentifier];
}
cell.textLabel.text = [boatsForOwner objectAtIndex:indexPath.row];
return cell;
}
This is supposed to return the boat owner company from a PickerWheel, and give me their boats in the table. This code returns nothing in the table. The PickerWheel logs 'Owner1' when I select it.
Is my error in how I add objects to the array or how I initialize the table or how I compare PickerWheel result to a word?

Answer 1

After you do
[self.boatsForOwner addObject:#"Titanic"];
You will manually need to refresh you tableview.. so after that do
[_yourTableView reloadData];
I would also initialize your arrays like this:
boatsForOwner = [NSMutableArray new];

Answer 2

I think first alloc & init the array "boatsForOwner "
replace your picker didSelectRow method with
-(void)pickerView:(UIPickerView *)pickerView
didSelectRow:(NSInteger)row
inComponent:(NSInteger)component
{
NSString *boatsFromOwner = [boatOwners objectAtIndex:[shipOwners selectedRowInComponent:0]];
if(boatsForOwner) {
[boatsForOwner release];
boatsForOwner = nil;
}
boatsForOwner = [NSMutableArray alloc] init];
if ([boatsFromOwner isEqualToString:#"Owner1"]) {
[self.boatsForOwner addObject:#"Titanic"];
}
NSLog(#"%#",boatsFromOwner);
[tableObject reloadData];
}
and release boatsForOwner when you dealloc.