CODEWITHSUNDEEP
iosobjective-c
Roshan Sah
Roshan Sah

Reputation: 137

using comparator i achieved to get this data

Data are ... ... ...

Event name :- HSS WE Date :- 6/10/2016 - 7/10/2016

Event name :- CSS Retreat Date :- 6/10/2016 - 9/10/2016

Event name :- Digital Public Conference Date :- 6 October 2016 - 7 October 2016

Event name :- GEO Conference Date :- 6/10/2016 - 7/10/2016

Event name :- ISB Conference Date :- 6 October 2016 - 7 October 2016 ... ... ... etc

I have sorted this using time Stamp, But now as I have same date, I want to sort this data with event name Ascending without affecting other datas in my array.

Upvotes: 0

Views: 66

Answers (1)

Larme
Larme

Reputation: 26026

Let's say that you have this class:

@interface EventInfo
//Note that calling a NSDate with timeStamp is weird, we may expect a NSTimerInverval
@property (nonatomic, strong) NSDate eventStartTimeStamp; 
@proprety (nonatomic, strong) NSDate eventName;
@end

You use a NSComparisonResult block. Instead of simply return the comparison of the dates, if is the date is the same, return then the comparison (alphabetical) with the event name.

NSMutableArray *array = //Your array of EventInfo objects;
[array sortUsingComparator:^NSComparisonResult(EventInfo * _Nonnull event1, EventInfo * _Nonnull event2) {
    NSComparisonResult dateCompare = [event2.eventStartDateStamp compare:event1.eventStartDateStamp]; 
    /*Date are not the same => Date comparison is priority*/
    if (dateCompare != NSOrderedSame)
    {
       return dateCompare;
    }
    else/*Same date => Use Event name to sort*/
    {
        return [event2.eventName compare:event1.eventName];
        //or return [event1.eventName compare:event2.eventName]; depending on alphabetical or reversed 
    }
}];

Upvotes: 1

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