[__NSCFCalendar components:fromDate:toDate:options:]: fromDate cannot be nil

问题

I am getting this error .How to solve it.Please suggest me. Crash Report [__NSCFCalendar components:fromDate:toDate:options:]: fromDate cannot be nil I mean really, what do you think that operation is supposed to mean with a nil fromDate? An exception has been avoided for now. A few of these errors are going to be reported with this complaint, then further violations will simply silently do whatever random thing results from the nil. Here is the backtrace where this occurred this time (some frames may be missing due to compiler optimizations): My code

NSString *str_babyedays=aMileBusiness.str_DAte;
    NSDateFormatter *df = [[NSDateFormatter alloc] init];
    [df setDateFormat:@"dd-MM-yyyy"];
    df.locale = [[NSLocale alloc] initWithLocaleIdentifier:@"EN"];
    NSDate *titemdate = [df dateFromString: str_babyedays];



    NSDate *currentDate = [NSDate date];
    NSCalendar *gregorian = [[NSCalendar alloc]
                             initWithCalendarIdentifier:NSGregorianCalendar];
    NSUInteger unitFlags = NSMonthCalendarUnit | NSDayCalendarUnit;
    NSDateComponents *components = [gregorian components:unitFlags
                                                fromDate:titemdate
                                                  toDate:currentDate options:0];

    NSInteger months = [components month];
    NSInteger day= [components day];

回答1:

Your titemdate is nil because your NSDateFormatter was unable to parse a date from str_babyedays. Straight from the Apple documentation for NSDateFormatter:

If dateFromString: can not parse the string, returns nil.

You can look at any of these questions to determine why it's nil.

NSDateFormatter dateFromString conversion

NSDateFormatter dateFromString Always Returns nil

dateFromString always returns null with dateformatter

来源：https://stackoverflow.com/questions/26760014/nscfcalendar-componentsfromdatetodateoptions-fromdate-cannot-be-nil