Sort array by one key then another key?

Question

basically I have an array of dictionaries and each dictionary has a day, month and year field.

I want to be able to sort the array by year, then by month, then by day. As if sorting a date.

Is this possible. This is what I have at the moment to sort by "date" as a whole:

NSSortDescriptor *aSortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"date" ascending:NO];
[winesOfTheWeek sortUsingDescriptors:[NSArray arrayWithObject:aSortDescriptor]];

Is there any way to do it three times so it sorts it by year, then by month (keeping the year structure) and then by day (keeping the year and month structure).

Thanks

Alex Reynolds · Accepted Answer · 2010-11-12 16:32:12Z

4

NSSortDescriptor *yearSortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"year" ascending:NO];
NSSortDescriptor *monthSortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"month" ascending:NO];
NSSortDescriptor *daySortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"day" ascending:NO];
[winesOfTheWeek sortUsingDescriptors:[NSArray arrayWithObjects:yearSortDescriptor, monthSortDescriptor, daySortDescriptor, nil]];
[daySortDescriptor release];
[monthSortDescriptor release];
[yearSortDescriptor release];

answered Nov 12, 2010 at 16:32

Alex Reynolds

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