How to sort NSMutableArray of date objects
Solution 1
First you should convert all date Strings (which is NSString
) objects to NSDate
objects and then sort these dateObjects
.
I believe you have dateArray
containing all those strings.
NSSortDescriptor *descriptor = [[NSSortDescriptor alloc] initWithKey:@"self"
ascending:NO];
NSArray *descriptors = [NSArray arrayWithObject:descriptor];
NSArray *reverseOrder = [dateArray sortedArrayUsingDescriptors:descriptors];
OR
NSArray *reverseOrderUsingComparator = [dateArray sortedArrayUsingComparator:
^(id obj1, id obj2) {
return [obj2 compare:obj1];
}];
Solution 2
If your dates are really strings in the format YYYY-mm-dd
, as in your question, then this will sort them in ascending order:
[arrayOfDates sortUsingSelector:@selector(compare:)];
That will also work if your dates are actually NSDate
objects.
If you want to create a sorted copy of the array:
NSArray *sortedArray = [arrayOfDates sortedArrayUsingSelector:@selector(compare:)];
Solution 3
Sorting should be done, imo, by the database, in general. sqlite3 does support order by.
Joker
Updated on June 17, 2022Comments
-
Joker about 2 years
I'm doing some small work on sorting the date strings in the NSMutableArray, i'm getting the array from the sqlite db. If you print the array it is showing like this
date strings are ( "2011-05-01", "2011-02-01", "2012-01-08", "2012-05-08", "2010-01-09 )
I want to show the dates in ascending order. Please help me out guys..... I'm newbie to objc..