I’ll chime in here with an answer based on experience. The answer is yes, caching NSDateFormatter app-wide is a good idea, however, for added safety there is a step you want to take for this. Why is it good? Performance. It turns out that creating NSDateFormatters is actually slow. I worked on an app that … Read more
Try this: NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; NSDate *currentDate = [NSDate date]; NSDateComponents *comps = [[NSDateComponents alloc] init]; [comps setYear:-18]; NSDate *minDate = [gregorian dateByAddingComponents:comps toDate:currentDate options:0]; [comps setYear:-150]; NSDate *maxDate = [gregorian dateByAddingComponents:comps toDate:currentDate options:0]; [comps release]; self.datePicker.minimumDate = minDate; self.datePicker.maximumDate = maxDate; It may be easily translated to Swift 4.2: let calendar … Read more