NSString compare is throwing exception SIGABT

Question

I have following code, where I'm comparing two string but its throwing exception.

- (void)calendarMonthView:(TKCalendarMonthView *)monthView didSelectDate:(NSDate *)d {
NSLog(@"calendarMonthView didSelectDate %@",d);
//[self papulateTable];
//[table reloadData];
 //[self performSelector:@selector(papulateTable) withObject:nil afterDelay:1.0];
NSString *tempDate = (NSString*)d;
NSString *selectedDate = @"2013-02-04 00:00:00 +0000";
if([tempDate isEqualToString:selectedDate])
{
  flagtoCheckSelectedCalendarDate = 1;
}
if(flagtoCheckSelectedCalendarDate == 1)
{
    [self viewDidLoad];
}
if(flagtoCheckSelectedCalendarDate == 2)
{
    [self viewDidLoad];
}
//[table reloadData];

}

Could any one please suggest.Thanks.

I think the problem is in the line NSString *tempDate = (NSString*)d; If you want to check two dates then NSDate have that feature use that. — Exploring, Feb 01 '13 at 10:38

Stavash · Accepted Answer · 2013-02-01T13:21:25.610

2

Casting an NSDate object to NSString does not make it a string. To compare dates, you're going to have to transform the NSString into an NSDate using an NSDateFormatter. After that, you can use NSDate's instance method isEqualToDate: for your comparison.

NSString *selectedDate = @"2013-02-04 00:00:00 +0000";
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setTimeZone:[NSTimeZone timeZoneWithAbbreviation:@"UTC"]];
[dateFormatter setDateFormat:@"yyyy-MM-DD hh:mm:ss ZZZZ"];
NSDate *actualDate = [dateFormatter dateFromString:selectedDate];


if ([actualDate isEqualToDate:d]) {
   ...
}

edited Feb 01 '13 at 13:21

answered Feb 01 '13 at 10:37

Stavash

14,244
5
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Thanks for this code. My "d" is comming in "2013-02-04 04:30:00 IST" format.And, the compair fails.So,its not going inside if statement. Note: I'm using Calendar to selet my date. – bapi Feb 01 '13 at 11:10
It doesn't matter what format was used to create a date, in the end you have 2 NSDate objects that represent a date (in any format). Please explain your problem in depth. – Stavash Feb 01 '13 at 11:13
Problem is: after using "NSDate *actualDate = [dateFormatter dateFromString:selectedDate];" My date is showing "actualDate = 2013-01-04".How it is going back to Jan month after using dateFormatter? – bapi Feb 01 '13 at 11:41
Thanks for help. I just change the format to : [dateFormatter setDateFormat:@"yyyy-MM-DD hh:mm:ss zzzz"]; Because, my time zone is GMT+5.30.Now its working. – bapi Feb 01 '13 at 13:51

score 1 · Answer 2 · answered Feb 01 '13 at 10:37

1

d is of type NSDate and not NSString, therefore -isEqualToString: results in a crash.
You shouldn't compare strings here, but the dates. Use NSDate's -compare: method and change

NSString *selectedDate = @"2013-02-04 00:00:00 +0000";

to

NSDate *selectedDate = [NSDate ...];

answered Feb 01 '13 at 10:37

Fabian Kreiser

8,307
1
34
60

Could you pl. tell me what should I write between "[NSDate ...];" – bapi Feb 01 '13 at 10:48
That depends on which date you want to compare to. You can use NSCalendar to create a date on a specific day/month/year or convert the string to a date using what @Stavash posted. – Fabian Kreiser Feb 01 '13 at 11:06

score 0 · Answer 3 · edited Sep 23 '15 at 14:39

0

You are comparing NSDate and NSString. You would need to change the NSDate to string using a date formatter first.

edited Sep 23 '15 at 14:39

answered Feb 01 '13 at 10:35

Prajwal Rauniyar

136
2

score 0 · Answer 4 · edited May 23 '17 at 12:22

0

You are casting an NSDate object to NSString without converting it. You will have to format the NSDate as a string into your expected date format before you can compare it with your selectedDate. See this previous answer or this one for examples

edited May 23 '17 at 12:22

Community

1
1

answered Feb 01 '13 at 10:36

Spathi Wankenstein

196
8

NSString compare is throwing exception SIGABT

4 Answers4

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