在目标c中用日期月份和年份对日期数组进行排序

Question

I want to sort an array with a date but the date has only sort with date and month, and not sorting with year my code:

NSArray *sortedArray = [arrClassSehedule sortedArrayUsingComparator:^NSComparisonResult(NSDictionary *obj1, NSDictionary *obj2) {
    NSDate *d1 = [appSharedData.CommanFormatForConditional dateFromString: [obj1 objectForKey:@"scheduleStart"]];
    NSDate *d2 = [appSharedData.CommanFormatForConditional dateFromString: [obj1 objectForKey:@"scheduleStart"]];
    return [d1 compare: d2];
}];

It's not sorting properly by date.

Answer 1

The problem is for d1 you are using obj1 and for d2 you also use obj1 . So just a typo as Lal Krishna wrote. Here's the fixed version:

NSArray *sortedArray = [arrClassSehedule sortedArrayUsingComparator:^NSComparisonResult(NSDictionary *obj1, NSDictionary *obj2) {
    NSDate *d1 = [appSharedData.CommanFormatForConditional dateFromString:[obj1 objectForKey:@"scheduleStart"]];
    NSDate *d2 = [appSharedData.CommanFormatForConditional dateFromString:[obj2 objectForKey:@"scheduleStart"]];
    return [d1 compare:d2];
}];

Answer 2

It seems like a typo.

Please replace the code with

 NSDate *d2 = [appSharedData.CommanFormatForConditional dateFromString: [obj2 objectForKey:@"scheduleStart"]];