Saving arrays of iOS Apps - arrays

Question

I would like to know how to save arrays of my iOS app. I used a method, but it only saved on my iPod Touch. I'd tested on iPad and it didn't work.
What I need is a code to save my app array on any device...
Anyone can help me?
Here is the code:
myAppViewController.h:
- (NSString *)GetApplicationDocumentsDirectory;
- (void)applicationWillTerminate:(NSNotification *)notification;
myAppViewController.m:
-(NSString*) GetApplicationDocumentsDirectory {
static NSString* documentsDirectory = nil;
if (documentsDirectory == nil) {
documentsDirectory = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask,
YES)
objectAtIndex:0] retain];
}
NSString *fullFileName = [NSString stringWithFormat:#"%#/TarefasSalvas.plist", documentsDirectory];
return fullFileName;
}
- (void)applicationWillTerminate:(NSNotification *)notification{
NSMutableArray *array = [[NSMutableArray alloc] init];
[array addObject:lisTitulos];
[array addObject:lisImagens];
[array addObject:lisData];
[array addObject:lisDetalhes];
[array writeToFile:[self GetApplicationDocumentsDirectory] atomically:YES];
}
- (void)viewDidLoad {
[super viewDidLoad];
NSString *filePath = [self GetApplicationDocumentsDirectory];
//if ([[NSFileManager defaultManager] fileExistsAtPath:filePath]) {
NSMutableArray *array = [[NSMutableArray alloc] initWithContentsOfFile:filePath];
if (array != nil){
lisTitulos = [array objectAtIndex:0];
lisImagens = [array objectAtIndex:1];
lisData = [array objectAtIndex:2];
lisDetalhes = [array objectAtIndex:3];
}
else {
NSDate *date = [NSDate date];
NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
[dateFormat setLocale:[NSLocale currentLocale]];
[dateFormat setDateFormat:#"dd/MM/YYYY"];
NSString *dateNow = [dateFormat stringFromDate:date];
lisTitulos = [[NSMutableArray alloc] initWithObjects:#"Titulo",nil];
lisImagens = [[NSMutableArray alloc] initWithObjects:#"0.png",nil];
lisData = [[NSMutableArray alloc] initWithObjects:dateNow,nil];
lisDetalhes = [[NSMutableArray alloc] initWithObjects:#"",nil];
}
UIApplication *app = [UIApplication sharedApplication];
[[NSNotificationCenter defaultCenter] addObserver:self selector:#selector(applicationWillTerminate:) name:UIApplicationWillTerminateNotification object:app];
}
Thanks

Answer 1

It is possible that you're just sending the app to the background and not terminating them. On such occasion, applicationWillTerminate: will not be called. That seems to be the likely cause as the rest of the code looks fine.
And your GetApplicationDocumentsDirectory seems a bit strangely named as it gets the path to the file in which the array is stored. In addition to that,
NSString *fullFileName = [NSString stringWithFormat:#"%#/TarefasSalvas.plist", documentsDirectory];
is not the correct way of getting the file path. You should use thestringByAppendingPathComponent: method on documentsDirectory like this,
NSString *fullFileName = [documentsDirectory stringByAppendingPathComponent:#"TarefasSalvas.plist"];
It would also make sense to declare fullFileName as the static variable rather than documentsDirectory.

Answer 2

Thanks #Deepak.
After u giving me the hint about making the Log Alerts on Debugging, I noticed that the iPad is killing the App and then the app can't call the applicationWillTerminate: method as you mentioned before.
So I solved the Problem changing my code to:
- (void)applicationWillTerminate:(NSNotification *)notification{
[self SavingStatus];
}
-(void)SavingStatus {
NSMutableArray *array = [[NSMutableArray alloc] init];
[array addObject:lisTitulos];
[array addObject:lisImagens];
[array addObject:lisData];
[array addObject:lisDetalhes];
[array writeToFile:[self GetApplicationDocumentsDirectory] atomically:YES];
}
As you can see, I created a method that I call on applicationWillTerminate: method and everytime the app reload the Table data:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *CellIdentifier = #"Cell";
...
[self SavingStatus];
return cell;
}
By this way, even if your device Kill the App before it Close normally, the informations will be saved anyway =D.
Thanks again to #Deepak
and everybody who replied me.