Sort array of string by day of week

Question

I have an NSMutableArray containing abbreviated days of the week, sun, mon, tue, wed, thu, fri, sat. I am trying to sort it so that they will always be in this order, no matter which days are there, and/or their current order. How do I sort the string so that they are always in the right order?

I tried using

    NSArray* sorted = [parent.medication.days sortedArrayUsingComparator:^NSComparisonResult(NSString* obj1, NSString* obj2) {

        // sort by position of id string in order array..
        NSUInteger obj1Pos = [idsInOrder indexOfObject:obj1[@"sun"] ];
        NSUInteger obj2Pos = [idsInOrder indexOfObject:obj2[@"mon"] ];

        return [[NSNumber numberWithInteger:obj1Pos] compare:[NSNumber numberWithInteger:obj2Pos]];
    }];

But all that did was throw errors on me, and it didn't even include all 7 days.

Worakarn Isaratham · Accepted Answer · 2013-11-13 03:12:20Z

1

Just remove [@"sun"] and [@"mon"] from the lines where you call indexOfObject:.

answered Nov 13, 2013 at 3:12

Worakarn Isaratham

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