ECGraph not working on device, but works on simulator

Question

is there any reason why ECGraph would run fine on the simulator, but yet give me this error when i run it on my device:

 2012-08-24 01:57:18.543 Portfolio[3538:9         


        

Answer 1

You are trying to get NSDateComponents from a nil NSDate like that:

NSCalendar* gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDate* fromDate = nil;
NSDate* toDate = [NSDate date];
unsigned int components = NSYearCalendarUnit | NSDayCalendarUnit | NSMonthCalendarUnit | NSWeekCalendarUnit | NSWeekdayCalendarUnit | NSHourCalendarUnit;
NSDateComponents* dateComponents = [gregorian components:uintFlags fromDate:fromDate  toDate:toDate  options:0];

Probably a simple check can be useful:

NSDate* fromDate = nil;
NSDate* toDate = [NSDate date];

NSDateComponents* dateComponents = nil;

if(fromDate != nil)
{
 NSCalendar* gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
 unsigned int components = NSYearCalendarUnit | NSDayCalendarUnit | NSMonthCalendarUnit | NSWeekCalendarUnit | NSWeekdayCalendarUnit | NSHourCalendarUnit;
 dateComponents = [gregorian components:uintFlags fromDate:fromDate  toDate:toDate  options:0];
}