Sorting an different entities in a NSMutableArray by date

Question

I am pushing 3 different entities in a NSMutableArray, and need to compare them on the date.

But the 3 different entities have different names for the date.

I use the 3 entities: Birthday, Events, OtherEvents with the date properties: birthday, day, date.

Does anyone has any idea how to sort it like this. It has about 40 properties in it so its not a single comparison.

Thanks in advance

Answer 1

Try this:

[eventsArray sortUsingComparator:^NSComparisonResult(id obj1, id obj2) {

    NSDate *date1 = nil;
    NSDate *date2 = nil;

    if ([obj1 isKindOfClass:[Birthday class]]) {
        date1 = [obj1 birthday];
    } else if ([obj1 isKindOfClass:[Events class]) {
        date1 = [obj1 day];
    } else if ([obj1 isKindOfClass:[OtherEvents class]) {
        date1 = [obj1 date];
    }

    if ([obj2 isKindOfClass:[Birthday class]]) {
        date2 = [obj2 birthday];
    } else if ([obj2 isKindOfClass:[Events class]) {
        date2 = [obj2 day];
    } else if ([obj isKindOfClass:[OtherEvents class]) {
        date2 = [obj2 date];
    }

    return [date1 compare:date2];
}];