Table View assistance please

[tateyaku]

Hello,

I'm new to this site, and the whole iphone dev scene! I've a problem and am requesting some help. Since I am new, there are many terms strategies I don't understand. If possible, talk to me like I'm 4!

My problem: I have a UITableView and when a cell is clicked, it opens another xib/viewController. I've set up a singleton to pass data from the table to the new view. But once the cell is tapped and new view opens, what ever was set in the singleton is the only thing that is set. If you push back and try a different cell, it will not change to that cell's value. I need the value, and not the key. Here are some snippets of my code:

table view view controller.m
- (NSIndexPath *)tableViewUITableView *)tableView willSelectRowAtIndexPathNSIndexPath *) indexPath {

// --- determine which anime was selected ---
NSUInteger section = [indexPath section];
NSUInteger row = [indexPath row];
NSString *key = [keys objectAtIndex:section];
NSArray *nameSelection = [info objectForKey:key];
NSString *selectedItem = [nameSelection objectAtIndex:row];

NameOfAppDelegate *mainDelegate = (NameOfAppDelegate *)[[UIApplication sharedApplication]delegate];
mainDelegate.sharedVar = selectedItem;



if (ViewController == nil) {
self.viewInfoViewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:[NSBundle mainBundle]];
}
[self presentModalViewController:self.ViewController animated:YES];

return indexPath;
}



detail view controller.m
List_o_AnimeAppDelegate *mainDelegate = (List_o_AnimeAppDelegate *)[[UIApplication sharedApplication]delegate];
NSString *viewBy = mainDelegate.sharedVar;

self.engTitle.text = viewBy;
[viewBy release];
viewBy = nil;



back button detail view controller.m
-(IBAction) barButtonBack {
[self dismissModalViewControllerAnimated:YES];
}




I've read articles, and tutorials from every corner of the web and I can't figure this one out. I'm not say the information is not out there. I'm just saying that I haven't found it yet, and don't know where to look.

Thanx!

[matt62king]

Originally Posted by tateyaku

Hello,

I'm new to this site, and the whole iphone dev scene! I've a problem and am requesting some help. Since I am new, there are many terms strategies I don't understand. If possible, talk to me like I'm 4!

My problem: I have a UITableView and when a cell is clicked, it opens another xib/viewController. I've set up a singleton to pass data from the table to the new view. But once the cell is tapped and new view opens, what ever was set in the singleton is the only thing that is set. If you push back and try a different cell, it will not change to that cell's value. I need the value, and not the key. Here are some snippets of my code:

table view view controller.m
- (NSIndexPath *)tableViewUITableView *)tableView willSelectRowAtIndexPathNSIndexPath *) indexPath {

// --- determine which anime was selected ---
NSUInteger section = [indexPath section];
NSUInteger row = [indexPath row];
NSString *key = [keys objectAtIndex:section];
NSArray *nameSelection = [info objectForKey:key];
NSString *selectedItem = [nameSelection objectAtIndex:row];

NameOfAppDelegate *mainDelegate = (NameOfAppDelegate *)[[UIApplication sharedApplication]delegate];
mainDelegate.sharedVar = selectedItem;



if (ViewController == nil) {
self.viewInfoViewController = [[ViewController alloc] initWithNibName:@"ViewController" bundle:[NSBundle mainBundle]];
}
[self presentModalViewController:self.ViewController animated:YES];

return indexPath;
}



detail view controller.m
List_o_AnimeAppDelegate *mainDelegate = (List_o_AnimeAppDelegate *)[[UIApplication sharedApplication]delegate];
NSString *viewBy = mainDelegate.sharedVar;

self.engTitle.text = viewBy;
[viewBy release];
viewBy = nil;



back button detail view controller.m
-(IBAction) barButtonBack {
[self dismissModalViewControllerAnimated:YES];
}




I've read articles, and tutorials from every corner of the web and I can't figure this one out. I'm not say the information is not out there. I'm just saying that I haven't found it yet, and don't know where to look.

Thanx!

Try this in your table view controrler inside the viewWillAppear method.

[self.tableView reloadData];

[tateyaku]

Thank you for the reply!

I've tried to put the viewWillLoad into my app, but it wouldn't work where ever I put it. I'm not using a navigation based program, it's just a normal view/VC with a table placed inside with interface builder.

I've tried putting the reloadData code in other places in the code, but still no effect. With and with out the self. section. I've even tried the release / = nil / reload /reloadData for the shared variable, but still no positive effects.

Do you, or any one else have any other way of implementing this code, or a different way of passing the selected value to the new view?

[javaconvert]

Originally Posted by tateyaku

Thank you for the reply!

I've tried to put the viewWillLoad into my app, but it wouldn't work where ever I put it. I'm not using a navigation based program, it's just a normal view/VC with a table placed inside with interface builder.

I've tried putting the reloadData code in other places in the code, but still no effect. With and with out the self. section. I've even tried the release / = nil / reload /reloadData for the shared variable, but still no positive effects.

Do you, or any one else have any other way of implementing this code, or a different way of passing the selected value to the new view?

Well, viewWillLoad is never going to get called as it's not a valid method (unless I missed it in the documentation?). You can put it in viewDidLoad, but that will only update the data when the view is actually loaded. Try doing this:

-(void)viewWillAppear:(BOOL)animated {
    [self.tableView reloadData];
    [super viewWillAppear:animated];
}

So that every time the table view appears it will edit the data. I didn't test this because I don't have access to Xcode right now, so let me know what works and what doesn't and I'll try and help.

[tateyaku]

I tried this code in several different spots in my app, but it says:

[self.tableView reloadData];
error: request for member 'tableView' in something not a structure or union

[tateyaku]

Through the use of NSLog's I have found out that the table view is doing exactly what it should be doing. Reloading the table, passing the new selected row's value to the singleton and every thing else.

The part that is having the problem is the detail view after a cell is clicked. it's not refreshing the variable that holds the singleton's value. I have put viewWillAppear method in, and it lists a NSLog everytime. I have the methods to display the value received in the viewDidLoad method.


I apologize for the miss information. Being a newbie sucks.....

[tateyaku]

I have found the answer! It may be a simple fix, or something that shouldn't have happened in the first place, but we all must start somewhere, and this is where I started, hehe.

I took the entire code out of the viewDidLoad method and placed it into viewWillAppear. This is probably a bad idea in itself, but for now the app works.

Any advice? Any thing to make my app work better/more efficient would be greatly appreciated

[dljeffery]

Originally Posted by tateyaku

I have found the answer! It may be a simple fix, or something that shouldn't have happened in the first place, but we all must start somewhere, and this is where I started, hehe.

I took the entire code out of the viewDidLoad method and placed it into viewWillAppear. This is probably a bad idea in itself, but for now the app works.

Any advice? Any thing to make my app work better/more efficient would be greatly appreciated

It's not a bad idea at all. viewDidLoad might only get called once during the whole run of your app. It's definitely not where you should be setting values based on table selections.