ios - 如何比较两个日期？

Question

我正在为我的 iOS 项目使用 DSLCalenderview。我需要在 DSLCalenderview 的日期中填充颜色。我将特定日期存储到 NSMutablearray 中，并将其与日期对象进行比较。 DSLCalenderview 代码是:

- (void)drawBackground {
    NSDateFormatter *dateformatter=[[NSDateFormatter alloc] init];
    [dateformatter setTimeZone:[NSTimeZone systemTimeZone]];
    //[dateformatter setLocale:[NSLocale currentLocale]];
    [dateformatter setDateFormat:@"MMMM yyyy dd HH:mm:ss Z"];
    if (self.selectionState == DSLCalendarDayViewNotSelected) {
        user=[[NSUserDefaults alloc] init];

        NSUInteger flags = NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit;
        NSCalendar *calendar = [NSCalendar currentCalendar];

        NSDateComponents *components = [calendar components:flags fromDate:[self.day date]];

        NSDateComponents *componentsOfToday = [calendar components:flags fromDate:[NSDate date]];

        date = [calendar dateFromComponents:components];

        dateToday = [calendar dateFromComponents:componentsOfToday];

        if (self.isInCurrentMonth) {

            /*
            for (int i=0;i<datearray.count;i++) {

                dateSelected=[dateformatter dateFromString:[datearray objectAtIndex:i]];
            }


            if ([date isEqualToDate:dateSelected]) {

                NSLog(@"date selected......... %@",dateSelected);



                }
            */

        //    NSLog(@">>>>>>>>>>>>>>>>>>>>>>>>>>>>>");
            if ([date isEqualToDate:dateToday]) {
             //   NSLog(@"inside today......... %@",dateToday);
                [[UIColor redColor] setFill];
                //from now current day is colored
            }
            else {

                //NSLog(@"date selected %@",dateSelected);
                [[UIColor colorWithWhite:245.0 / 255.0 alpha:1.0] setFill];
            }

        }
        else {

           // NSLog(@"++++++++++++++++++++++++++++++");
            if ([date isEqualToDate:dateToday]) {

                [[UIColor greenColor] setFill];

            }
            else {

                [[UIColor colorWithWhite:225.0 / 255.0 alpha:1.0] setFill];
            }

            for (int i=0;i<datearray.count;i++) {

                dateSelected=[dateformatter dateFromString:[datearray objectAtIndex:i]];
                NSLog(@"date %@  dateselected %@",date,dateSelected);
                NSDateComponents *selected=[calendar components:flags fromDate:dateSelected];
                dateSelected=[calendar dateFromComponents:selected];
                NSLog(@"date %@ dateselected %@",date,dateSelected);
                if ([date isEqualToDate:dateSelected]) {
                    NSLog(@"inside loop");
                    [[UIColor grayColor]setFill];
                }
            }


        }
        UIRectFill(self.bounds);
    }
    else {
        switch (self.selectionState) {

            case DSLCalendarDayViewNotSelected:

                NSLog(@"DSLCalendarDayViewNotSelected>>>>+++");

                break;

            case DSLCalendarDayViewStartOfSelection:

                NSLog(@"DSLCalendarDayViewStartOfSelection>>>>+++");
                [[[UIImage imageNamed:@"DSLCalendarDaySelection-left"] resizableImageWithCapInsets:UIEdgeInsetsMake(20, 20, 20, 20)] drawInRect:self.bounds];

                break;

            case DSLCalendarDayViewEndOfSelection:
                NSLog(@"DSLCalendarDayViewEndOfSelection>>>>+++");

                [[[UIImage imageNamed:@"DSLCalendarDaySelection-right"] resizableImageWithCapInsets:UIEdgeInsetsMake(20, 20, 20, 20)] drawInRect:self.bounds];
                break;

            case DSLCalendarDayViewWithinSelection:

                NSLog(@"DSLCalendarDayViewWithinSelection>>>>+++");



                [[[UIImage imageNamed:@"DSLCalendarDaySelection-middle"] resizableImageWithCapInsets:UIEdgeInsetsMake(20, 20, 20, 20)] drawInRect:self.bounds];
                break;

            case DSLCalendarDayViewWholeSelection:

                NSLog(@" DSLCalendarDayViewWholeSelection");


                 NSLog(@"day select %@",selectedday);
                [[NSUserDefaults standardUserDefaults] setObject:selectedday forKey:@"day"];
                [[NSUserDefaults standardUserDefaults]synchronize];


                [[[UIImage imageNamed:@"DSLCalendarDaySelection"] resizableImageWithCapInsets:UIEdgeInsetsMake(20, 20, 20, 20)] drawInRect:self.bounds];

                break;
        }
    }
}

Answer 1

我想我找到了答案

  for (int i=0;i<datearray.count;i++) {

            dateSelected=[dateformatter dateFromString:[datearray objectAtIndex:i]];
            NSLog(@"date %@  dateselected %@",date,dateSelected);
            NSDateComponents *selected=[calendar components:flags fromDate:dateSelected];
            dateSelected=[calendar dateFromComponents:selected];
            NSLog(@"date %@ dateselected %@",date,dateSelected);
            if ([dateSelected isEqualToDate:date]) {  //just swapped values and date will be highlighted 
                NSLog(@"inside loop");
                [[UIColor grayColor]setFill];
            }
        }