Sort Objectsdictionnary - ios

Question

I have a tableview that contains multiple sections, grouped by an attribute of my object (date) I try to sort the tableview according to the value of date.I created a function for that , but I get an error :
- (void)sortObjectsDictionnary:(NSArray *)arrayObjects
{
//this is my nsdictionnary
[objects removeAllObjects]
//this is nsmutableaaray that contains dats
[objectsIndex removeAllObjects];
NSMutableSet *keys = [[NSMutableSet alloc] init];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:#"yyyy/MM/dd"];
for(int i=0;i<[arrayObjects count];i++){
Task *myTask=[arrayObjects objectAtIndex:i];
//curentsection contains my objects whith dates
NSMutableArray *currentSection = [objects objectForKey:taskDate];
if (currentSection == nil)
{
[keys addObject:taskDate];
currentSection = [[[NSMutableArray alloc] init] autorelease];
[objects setObject:currentSection forKey:taskDate];
}
// we add objet to the right section
[currentSection addObject:myTask];
}
[dateFormatter release];
for (id element in keys)
{
[objectsIndex addObject:element];
NSMutableArray *currentSection = [objects objectForKey:element];
//I get an error in this line
[currentSection sortUsingSelector:#selector(compare:)];
}

Answer 1

You haven't mentioned what the error message is and I am assuming the error message may be due to accessing NSMutableArray array object without initializing it. Try an alloc and init for array before
NSMutableArray *currentSection = [NSMutableArray]alloc]init];
currentSection = [objects objectForKey:element];
//I get an error in this line
[currentSection sortUsingSelector:#selector(compare:)];
Well it is purely a guess. Post your error message if this not works.
Bharath