Swift 4: Since Swift 4, this functionality has been added to the standard library. You can use it like so: Dictionary(grouping: statEvents, by: { $0.name }) [ “dinner”: [ StatEvents(name: “dinner”, date: “01-01-2015”, hours: 1), StatEvents(name: “dinner”, date: “01-01-2015”, hours: 1), StatEvents(name: “dinner”, date: “01-01-2015”, hours: 1) ], “lunch”: [ StatEvents(name: “lunch”, date: “01-01-2015”, hours: … Read more
Swift 3 and Swift 2: You can use a dictionary of type [String: Int] to build up counts for each of the items in your [String]: let arr = [“FOO”, “FOO”, “BAR”, “FOOBAR”] var counts: [String: Int] = [:] for item in arr { counts[item] = (counts[item] ?? 0) + 1 } print(counts) // “[BAR: … Read more
If I have an NSMutableArray of objects with a field “beginDate” of type NSDate I am using an NSSortDescriptor as below: NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@”beginDate” ascending:TRUE]; [myMutableArray sortUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]]; [sortDescriptor release];
There is a much easier solution, if you take advantage of the built-in reverseObjectEnumerator method on NSArray, and the allObjects method of NSEnumerator: NSArray* reversedArray = [[startArray reverseObjectEnumerator] allObjects]; allObjects is documented as returning an array with the objects that have not yet been traversed with nextObject, in order: This array contains all the remaining … Read more
I’m assuming you want to sort on date… NSArray *sortedArray = [FullData sortedArrayUsingDescriptors:@[[NSSortDescriptor sortDescriptorWithKey:@”FileDate” ascending:NO]]; That should do it.