UIDatePicker设定最大时间和最小时间

-(UIDatePicker *)XSDataPicker{
    if (!_XSDataPicker) {
        _XSDataPicker = ({
            UIDatePicker * picker = [[UIDatePicker alloc]initWithFrame:CGRectZero];
            picker.datePickerMode = UIDatePickerModeDate;
            
//          NSDate * date =  [NSDate dateWithString:@"2000-01-01" format:@"yyyy-MM-dd" timeZone:[NSTimeZone systemTimeZone] locale:[NSLocale currentLocale]];
            NSCalendar * gregorian = [[NSCalendar alloc]initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
            NSDateComponents * dateComponts = [[NSDateComponents alloc]init];
            [dateComponts setYear:-18];
            NSDate * date =   [gregorian dateByAddingComponents:dateComponts toDate:[NSDate date] options:0];
            picker.date = date;
            picker.maximumDate = date;
            NSDate * minidate =  [NSDate dateWithString:@"1900-01-01" format:@"yyyy-MM-dd" timeZone:[NSTimeZone systemTimeZone] locale:[NSLocale currentLocale]];
            picker.minimumDate = minidate;
            picker;
        });
    }
    return _XSDataPicker;
}