Question

I am creating an app that needs to put all dates of the year into a uitableview (each date having their own cell). Is there any way to use the nsdate to populate each cell with every date?

Answer 1

You will need to create the NSDate instances manually if you need to display all dates from 1 January through 31 December.

The following methods might help with the NSDate instances you need for your UITableView cells:

- (NSInteger)daysInYear:(NSInteger)year {
    if (year % 400 == 0)        return 366;
    else if (year % 100 == 0)   return 365;
    else if (year % 4 == 0)     return 366;
    else                        return 365;
}


- (NSDate *)firstDayInYear:(NSInteger)year {
    NSDateFormatter *fmt = [[NSDateFormatter alloc] init];
    [fmt setDateFormat:@"MM/dd/yyyy"];
    NSDate *firstDayInYear = [fmt dateFromString:[NSString stringWithFormat:@"01/01/%d", year]];
    [fmt release];
    return firstDayInYear;
}


- (NSDate *)dateWithDayInterval:(NSInteger)dayInterval sinceDate:(NSDate *)referenceDate {
    static NSInteger SECONDS_PER_DAY = 60 * 60 * 24;
    return [NSDate dateWithTimeInterval:dayInterval * SECONDS_PER_DAY sinceDate:referenceDate];
}

In your tableView:cellForRowAtIndexPath: method you can then instantiate the corresponding NSDate instance:

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
    NSDate *dateForCell = [self dateWithDayInterval:indexPath.row sinceDate:self.firstDayInYear];
    // ... rest of your method ...
}