Any good example of sorting a NSArray using sortedArrayUsingFunction ?
TY!
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3 Answers
NSArray *sorted_bookings = [myUnsortedArray sortedArrayUsingFunction:Sort_Bookingdate_Comparer context:self];
NSInteger Sort_Bookingdate_Comparer(id id1, id id2, void *context)
{
// Sort Function
Booking* booking1 = (Booking*)id1;
Booking* booking2 = (Booking*)id2;
return ([booking1.BOOKING_DATE compare:booking2.BOOKING_DATE]);
}
This I used to sort bookings by bookingdate. Booking is a class with a synthesized instance variable called BOOKING_DATE.
2 Comments
Martha
I was wondering if it returned a sorted array or if it sorts the array (myUnsortedArray) itself. Iguess ur example answers that. TY!
hol
In my case I wanted a new array. But if your array is a NSMutableArray there is an instance method that just sorts the array. Just as in the example of Bogatyr
As stated in the documentation: http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSArray_Class/NSArray.html
NSInteger intSort(id num1, id num2, void *context)
{
int v1 = [num1 intValue];
int v2 = [num2 intValue];
if (v1 < v2)
return NSOrderedAscending;
else if (v1 > v2)
return NSOrderedDescending;
else
return NSOrderedSame;
}
Comments
Close analogue using NSMutableArray:
[opponentMatchDicts sortUsingFunction:compareMatchByDate context:nil];
...
static int compareMatchByDate( id m1, id m2, void *context)
{
NSDictionary *mDict1 = (NSDictionary *) m1;
NSDictionary *mDict2 = (NSDictionary *) m2;
NSDate *date1 = [mDict1 objectForKey:kMatchNSDate];
NSDate *date2 = [mDict2 objectForKey:kMatchNSDate];
int rv = [date1 compare:date2];
return rv;
}
Comments
