nsmutablearray

Can someone please show me the code for sorting an NSMutableArray? I have the following NSMutableArray: NSMutableArray *arr = [[NSMutableArray alloc] init]; with elements such as "2", "4", "5", "1", "9", etc which are all NSString. I'd like to sort the list in descending order so that the largest valued integer is highest in the list (index 0). I tried the following: [arr sortUsingSelector:@selector(compare:)]; but it did not seem to sort my values properly. Can someone show me code for properly doing what I am trying to accomplish? Thanks! It's pretty simple to write your own comparison

After some searching, I got the following solution : reference . CLLocationCoordinate2D* new_coordinate = malloc(sizeof(CLLocationCoordinate2D)); new_coordinate->latitude = latitude; new_coordinate->longitude = longitude; [points addObject:[NSData dataWithBytes:(void *)new_coordinate length:sizeof(CLLocationCoordinate2D)]]; free(new_coordinate); And access it as: CLLocationCoordinate2D* c = (CLLocationCoordinate2D*) [[points objectAtIndex:0] bytes]; However, someone claims that there is a memory leak here? Can anyone suggest me where is the leak and how to fix it. Further, is there a better

NSArray *array = [[NSArray alloc] initWithObjects:@"ΕΛΤΑ", @"ΕΛΤΑ COURIER", @"ACS", @"ACS ΕΞΩΤΕΡΙΚΟ", @"DHL", @"INTERATTICA", @"SPEEDEX", @"UPS", @"ΓΕΝΙΚΗ ΤΑΧΥΔΡΟΜΙΚΗ", @"ΜΕΤΑΦΟΡΙΚΕΣ ΕΞΩΤΕΡΙΚΟΥ", nil]; This is working because it has nil at the end. But I add objects like this: addObject:name etc... So at the end I have to add nil I do this addObhect:nil but when I run the app it still crashes at cellForRowAtIndexPath: how can I do this work? Ok, I dont have to add nil What is the reason that my app crashes then? mr-sk You can't add nil when you're calling addObject . Adrian Kosmaczewski If you

In a Master-Detail app I'd like to display a TableView with 5 sections titled: Your Move Their Move Won Games Lost Games Options So I create a blank Master-Detail app in Xcode 5.0.2 and then in its MasterViewController.m (which is a UITableViewController) I'm trying to implement the method: - (NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section { return _titles[section]; } My question is however how to init the NSArray _titles? I'm trying in the MasterViewController.m: #import "MasterViewController.h" #import "DetailViewController.h" static NSArray *_titles

I'm looking for a method of turning a NSMutableArray into a string. Is there anything on a par with this Ruby array method? >> array1 = [1, 2, 3] >> array1.join(',') => "1,2,3" Cheers! Jason Coco NSArray *array1 = [NSArray arrayWithObjects:@"1", @"2", @"3", nil]; NSString *joinedString = [array1 componentsJoinedByString:@","]; componentsJoinedByString: will join the components in the array by the specified string and return a string representation of the array. Rémy The method you are looking for is componentsJoinedByString . NSArray *a = [NSArray arrayWithObjects:@"1", @"2", @"3", nil];/

I can't figure out what is causing this. Basically, a few different 'tasks' are colliding with each other in my app. When i press a button, it runs this code just fine: PalAppDelegate *dataCenter = (PalAppDelegate *)[[UIApplication sharedApplication] delegate]; [dataCenter.colourPalettesContainer addObject:[NSNumber numberWithInt:5]]; It can do this as many times as i like. But when i perform another task (and theres a few which cause this to happen), which involves this code for example: PalAppDelegate *dataCenter = (PalAppDelegate *)[[UIApplication sharedApplication] delegate]; [dataCenter