the following objective-C code 6.2 ( SDK 8.2) :
NSArray *the_datums = [[readCSV alloc] read_csv_from_url:fname] ;// is an array of date in Y-M-D H format read from a CSV file
NSMutableArray *les_dates = [[NSMutableArray alloc] init];
for (int i =0 ; i< the_datums.count ; i++){
NSString *str = [the_datums objectAtIndex:i] ;
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"yyyy-MM-dd H"];
NSDate *date = [dateFormatter dateFromString: str];
dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"d"];
NSString *convertedString = [dateFormatter stringFromDate:date];
[les_dates insertObject:convertedString atIndex:i];
}
works if the Iphone/Ipad is not in AM:PM mode(via IOS control panel). BUT if i switch the idevice to AM:PM and relaunch the APP , Xcode throws me stones on my face :
* Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '* -[__NSArrayM insertObject:atIndex:]: object cannot be nil'
How can NSdateFormatter result change and be nil when user changes the format of the iphone clock ? Is there any explaination ?
