nsarray

I have an NSArray, and I want to split it into two equal pieces (if odd "count" then add to the latter new array) - I want to split it "down the middle" so to speak. The following code does exactly what I want, but is there a better way?: // NOTE: `NSArray testableArray` is an NSArray of objects from a class defined elsewhere; NSMutableArray *leftArray = [[NSMutableArray alloc] init]; NSMutableArray *rightArray = [[NSMutableArray alloc] init]; for (int i=0; i < [testableArray count]; i=i+1) { if (i < [testableArray count]/2) { [leftArray addObject:[testableArray objectAtIndex:i]]; } else {

I have an NSArray with objects that have a name property. I would like filter the array by name NSString *alphabet = [agencyIndex objectAtIndex:indexPath.section]; //---get all states beginning with the letter--- NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF beginswith[c] %@", alphabet]; NSMutableArray *listSimpl = [[NSMutableArray alloc] init]; for (int i=0; i<[[Database sharedDatabase].agents count]; i++) { Town *_town = [[Database sharedDatabase].agents objectAtIndex:i]; [listSimpl addObject:_town]; } NSArray *states = [listSimpl filteredArrayUsingPredicate:predicate];

I'd like to be notified, when the count, ie. number of items in an NSArray changes.. Of course I wouldn't need this, if I was in control of addition and removal of objects into the array. But I am not, it happens unpredictably with regards to Business Process Model and depends on external factors. Is there some simple elegant solution? EDIT: I am correcting this to NSMutableArray of course.. CodaFi You’ll need to use KVC . But how to go about doing it? After all, NSMutableArray is not Key-Value-Coding compliant for its mutation methods or contents changes. The answer is proxying –as