Class method returning empty array - objective-c

Question

I have written a class method that converts columnar data from a text file and returns an array of arrays...only it is returning an EMPTY array of EMPTY arrays.
+(NSArray *) initArrayWithFileContents:(NSString *) theFilePath
{
NSString *theContents = [self loadFile:theFilePath];
NSArray *theParagraphs = [self getParagraphs:theContents];
NSMutableArray *teamData = [[NSMutableArray alloc] init]; // array of team data
NSMutableArray *leagueData = [[NSMutableArray alloc] init]; // array of arrays
// set up number formatters for getting numbers from strings
NSNumberFormatter *numberStyle = [[NSNumberFormatter alloc] init];
NSNumberFormatter *positiveNumberStyle = [[NSNumberFormatter alloc] init];
[numberStyle setNumberStyle:NSNumberFormatterDecimalStyle];
[positiveNumberStyle setNumberStyle:NSNumberFormatterDecimalStyle];
[positiveNumberStyle setPositiveFormat:#"'+'#"];
// set up a date and time formatter for getting time data from strings
NSDateFormatter *timeStyle = [[NSDateFormatter alloc] init];
[timeStyle setDateStyle:NSDateFormatterNoStyle];
[timeStyle setDateFormat:#" mm:ss"];
for (NSString *currentParagraph in theParagraphs)
{
NSArray *currentTeam = [self getcolumnarData:currentParagraph]; // get an array of strings
for (NSString *currentItem in currentTeam)
{
NSNumber *currentStat = [numberStyle numberFromString:currentItem];
if (currentStat != Nil) {
[teamData addObject:currentStat]; // number found
} else {
currentStat = [positiveNumberStyle numberFromString:currentItem];
if (currentStat != Nil) {
[teamData addObject:currentStat]; // number with '+' sign found
} else {
NSDate *currentTime = [timeStyle dateFromString:currentItem];
if (currentTime != Nil) {
NSNumber *theSeconds = [self calculateSeconds: currentTime];
[teamData addObject:theSeconds]; // time found
} else {
[teamData addObject:currentItem]; // string found
}
}
}
}
[leagueData addObject:teamData]; // add child array to end of parent array
[teamData removeAllObjects]; // reset child array
}
NSArray *dataToReturn = [NSArray arrayWithArray:leagueData]; // convert to NSArray to return
return dataToReturn;
}
In my debugging efforts I have verified that either an NSString or NSNumber is being added to the end of the teamData array but when adding teamData to leagueData an empty object is added. What am I missing?
Thanks in advance,
Brad

Answer 1

Move
NSMutableArray *teamData = [[NSMutableArray alloc] init];
into the loop:
for (NSString *currentParagraph in theParagraphs)
{
NSMutableArray *teamData = [[NSMutableArray alloc] init];
// ...
[leagueData addObject:teamData];
}
loop. At present, you always add the same array to leagueData.
An array "only" keeps pointers to its elements, so at the end all elements
of leagueData point to the same array teamData (from which you have removed
all objects).