NSDictionary to NSArray, will not display properly? - iphone

Question

I have a signature page, were the user can sign their name.
It needs to then be saved to NSDictionary, but i want to call a List of the keys to be text in a TableView for each row or cell.
so:
"viewImage = saved as object to key:Random Number"
That parts somewhat easy, the hard part is when i call it on the other Page to the TableView.
It Exits the App with Error"SIGABRT". Now all my Delegates are in place and working...i believe.
now heres some example code:
FirstPage.m
UIImagePNGRepresentation(viewImage);
NSMutableArray *innerArray = [[NSMutableArray array]init];
[innerArray addObject:viewImage];
[SignatureSave setObject:innerArray forKey:#"5599"];
simple Enough, but doesnt give me an error.
SecondPage.m
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
FirstPage *appShare = (FirstPage *)[[UIApplication sharedApplication] delegate];
NSArray *dataDuplicate = [[NSArray alloc]init ];
dataDuplicate = [appShare.SignatureSave allKeysForObject:#"innerArray"];
static NSString *CellIdentifier = #"Cell";
NSLog(#"%#",dataDuplicate);
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if(cell == nil)
{
cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero]autorelease];
}
if (dataDuplicate != nil) {
cell.textLabel.text = [dataDuplicate objectAtIndex:indexPath.row];
}
else
{
UIAlertView *CellAlert = [[UIAlertView alloc] initWithTitle:#"Error" message:#"Error Loading content, Try Again Later." delegate:self cancelButtonTitle:#"OK" otherButtonTitles:nil];
[CellAlert show];
[CellAlert release];
}
return cell;
}
#end
Now, How do i get the viewImage to save to the NSDictionary, to be able to call it on the SecondPage and display the name of the objects in the TableVIew?

Answer 1

I really don't understand whats your problem exactly.
first of all, is your dictionary a retained object?
//FirstPage.h
#property (nonatomic, retain) NSDictionary *SignatureSave;
//FirstPage.m
#synthesize SignatureSave;
…
UIImagePNGRepresentation(viewImage);
NSMutableArray *innerArray = [NSMutableArray array]; // using "array" is equivalent to alloc-init-autorelease
[innerArray addObject:viewImage];
[self.SignatureSave setObject:innerArray forKey:#"5599"];
// OR setting the array directly:
UIImagePNGRepresentation(viewImage);
NSArray *innerArray = [NSArray arrayWithObject:viewImage];
[self.SignatureSave setObject:innerArray forKey:#"5599"];
// OR even setting the image directly to the dictionary:
UIImagePNGRepresentation(viewImage);
[self.SignatureSave setObject:viewImage forKey:#"5599"];
now if you access the object by writing self. in front it will call the retain and your object will stay alive. Otherwise it would be autoreleased at the end of the method. This will fix the problem that your dictionary is maybe not present/available at table view creation and you don't have to use a singleton.
what are you trying to access with this code?
FirstPage *appShare = (FirstPage *)[[UIApplication sharedApplication] delegate];
with [[UIApplication sharedApplication] delegate] you get your application delegate (obviously). These are the MyAppNameAppDelegate files but you treat it as a FirstPage class.
Just NSLog() to check you get the right class, the one you expect.
NSLog(#"%#", [[[UIApplication sharedApplication] delegate] class]);
here you have a potential leak, you alloc-init but never release it:
NSArray *dataDuplicate = [[NSArray alloc]init ];
dataDuplicate = [appShare.SignatureSave allKeysForObject:#"innerArray"];
furthermore you can simplify it (will be autoreleased):
NSArray *dataDuplicate = [appShare.SignatureSave allKeysForObject:#"innerArray"];
and here you have another issue.
Why do you call all keys for the object #"innerArray"?
you don't have such an object and it's in many more cases wrong. innerArray was your previously named array in FirstPage.m but it is only for you as a developer to remember the variable better. After compilation it will have a cryptic name anyway. You could access your key #"5599" if you like but I don't think you want this. In your case you want to access all keys of the dictionary so simply call:
NSArray *dataDuplicate = [appShare.SignatureSave allKeys];
now you will have an array with all keys of your dictionary and you can access them like you do with objectAtIndex:.
NSString *keyName = [dataDuplicate objectAtIndex:indexPath.row];
cell.textLabel.text = keyName;
id theObject = [appShare.SignatureSave objectForKey:keyName]; // for example the image
Tell me if this solves your problems or tell me how I misunderstood your question.

Answer 2

I found the answer to this to be quit simple actually,
I ended up going with the Singleton Method instead of the Global Variable Method.
Now the Singleton Method looks terrifying but its quit simple, See here.
The main difference i noticed from the singleton method to the global method is,
Global method takes a lot of converting and re-converting.
Though the Singleton Method is working with a single object over many pages or classes.
Now i hope this will better assist people in the future also!