Способ показывать обратный отсчет в UITableViewCells, в каждой ячейке обратный отсчет должен быть с разным временем

Question

    - (void)viewDidLoad {
        [super viewDidLoad];
        tableData = [[NSArray alloc]initWithObjects:@"2018-05-16 06:00:00 p",@"2018-05-16 09:00:00 p",@"2018-05-16 11:00:00 p",@"2018-05-17 02:00:00 a",@"2018-05-17 04:00:00 a",nil];

       currDate = [NSDate date];
        NSDateFormatter *dateFormatter=[[NSDateFormatter alloc] init];
        [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss a"];
        NSLog(@"the current date and time is %@",currDate);

        NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
        [dateFormat setDateFormat:@"YYYY-MM-dd hh:mm:ss a"];
        NSString *fxdDate = @"2018-05-16 07:00:00 a";
        NSDate *StartDate = [ dateFormat dateFromString:[ NSString stringWithFormat:@"%@", fxdDate]];
       for(int i=0;i<tableData.count;i++)
        {

            EndDate = [dateFormat dateFromString:tableData[i]];
            NSDateComponents *components, *components2;
            NSInteger hours, minutesfromStart, minuteFromEnd,secondsFromEnd;

            components = [[NSCalendar currentCalendar] components: NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute fromDate: currDate toDate: StartDate options: 0];
            hours = [components hour];
            minutesfromStart = [ components minute];

            components2 = [[NSCalendar currentCalendar] components: NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute fromDate: currDate toDate: EndDate options: 0];

            minuteFromEnd = [ components2 minute];
            secondsFromEnd = [ components2 second];

            NSDateComponents *components1;
            NSInteger hours1, minutes1, Seconds1;
            components1 = [[NSCalendar currentCalendar] components: 
 NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond fromDate: currDate toDate: EndDate options: 0];
            hours1 = [components1 hour];
            minutes1 = [ components1 minute];
            Seconds1 = [ components1 second];

            currMinute = minutes1;
            currHours = hours1;
            currSeconds =Seconds1;

            NSLog(@"Time left is %ld:%ld:%ld", (long)hours1, (long)minutes1,(long)Seconds1);

           timer=[NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timerFired) userInfo:nil repeats:YES];
             }

   -(void)timerFired
{
       if(( currHours>=0 || currMinute >=0 || currSeconds>=0) && currSeconds>=0)
        {
            if(currSeconds==0 && currMinute>0)
            {
                currMinute-=1;
                currSeconds=59;
            }
            else if(currMinute==0 && currHours>0)
            {
                currHours-=1;
                currMinute=59;
            }
            else if(currSeconds>=0)
            {
                currSeconds-=1;
            }
            if(currSeconds>-1)

           [tableview reloadData];

        }


        else
        {
            [timer invalidate];
        }
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    static NSString *simpleTableIdentifier = @"Reuse";

    SimpleTableViewCell *cell = (SimpleTableViewCell *)[tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];

    if (cell == nil) {

       NSArray *nib =[[NSBundle mainBundle]loadNibNamed:@"SimpleTableViewCell" owner:self options:nil];
        cell=[nib objectAtIndex:0];
    }

    if(indexPath.row == 0)
    {
        cell.dynamicTimerLabel.text =[NSString stringWithFormat:@"%02ld:%02ld:%02ld",currHours,currMinute, currSeconds];



    }

    if(indexPath.row == 1)
    {
        cell.dynamicTimerLabel.text =[NSString stringWithFormat:@"%02ld:%02ld:%02ld",currHours,currMinute, currSeconds];

    }

    if(indexPath.row == 2)
    {
        cell.dynamicTimerLabel.text =[NSString stringWithFormat:@" %02ld:%02ld:%02ld",currHours,currMinute, currSeconds];

    }
    if(indexPath.row == 3)
    {

        cell.dynamicTimerLabel.text =[NSString stringWithFormat:@" %02ld:%02ld:%02ld",currHours,currMinute, currSeconds];

    }
    if(indexPath.row == 4)
    {

        cell.dynamicTimerLabel.text =[NSString stringWithFormat:@" %02ld:%02ld:%02ld",currHours,currMinute, currSeconds];

    }


    cell.TimerLabel.text = [tableData objectAtIndex:indexPath.row];
    return cell;
}

В приведенном выше коде он создает таймер обратного отсчета для ячеек UITableView, но он берет только последний элемент массива для таймера и уменьшает его для каждой ячейки, но я хочу, чтобы он брал каждый элемент массива для каждой клетки. Пожалуйста помоги. Функция таймера срабатывает только один раз.

Answer 1

1) Ваш таймер срабатывает один раз в секунду, что он уже делает, за исключением того, что все, что ему нужно для вызова, это reloadData. 2) Выполните вычисления времени в cellForRowAtIndexPath и на основе indexPath.row вычислите интервал между временем назначения для этой строки и текущим временем, затем отобразите этот интервал в часах: минутах: секундах. В настоящее время ваш таймер срабатывает, вычисляя один интервал, и все ячейки используют этот интервал для своей информации.

Answer 2

 if(indexPath.row == 0)
        {
            currDate = [NSDate date];
            NSDateFormatter *dateFormatter=[[NSDateFormatter alloc] init];
            [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss a"];
            NSLog(@"the current date and time is %@",currDate);

            NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
            [dateFormat setDateFormat:@"YYYY-MM-dd hh:mm:ss a"];
            NSString *fxdDate = @"2018-05-16 07:00:00 a";
            NSDate *StartDate = [ dateFormat dateFromString:[ NSString stringWithFormat:@"%@", fxdDate]];

            NSString *dynDate = @"2018-05-17 08:00:00 p";

            EndDate = [dateFormat dateFromString:dynDate];
                NSDateComponents *components, *components2;
                NSInteger hours, minutesfromStart, minuteFromEnd,secondsFromEnd;

                components = [[NSCalendar currentCalendar] components: NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute fromDate: currDate toDate: StartDate options: 0];
                hours = [components hour];
                minutesfromStart = [ components minute];

                components2 = [[NSCalendar currentCalendar] components: NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute fromDate: currDate toDate: EndDate options: 0];

                minuteFromEnd = [ components2 minute];
                secondsFromEnd = [ components2 second];

                NSDateComponents *components1;
                NSInteger hours1, minutes1, Seconds1;

                components1 = [[NSCalendar currentCalendar] components: NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond fromDate: currDate toDate: EndDate options: 0];
                hours1 = [components1 hour];
                minutes1 = [ components1 minute];
                Seconds1 = [ components1 second];

                currMinute = minutes1;
                currHours = hours1;
                currSeconds =Seconds1;

                NSLog(@"Time left is %ld:%ld:%ld", (long)hours1, (long)minutes1,(long)Seconds1);

              timer=[NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timerFired) userInfo:nil repeats:YES];

                 cell.dynamicTimerLabel.text =[NSString stringWithFormat:@"%02ld:%02ld:%02ld",currHours,currMinute, currSeconds];


            }





        if(indexPath.row == 1)
        {
            currDate = [NSDate date];
            NSDateFormatter *dateFormatter=[[NSDateFormatter alloc] init];
            [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss a"];
            NSLog(@"the current date and time is %@",currDate);

            NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
            [dateFormat setDateFormat:@"YYYY-MM-dd hh:mm:ss a"];
            NSString *fxdDate = @"2018-05-16 07:00:00 a";
            NSDate *StartDate = [ dateFormat dateFromString:[ NSString stringWithFormat:@"%@", fxdDate]];

            NSString *dynDate = @"2018-05-17 09:00:00 p";

            EndDate = [dateFormat dateFromString:dynDate];
            NSDateComponents *components, *components2;
            NSInteger hours, minutesfromStart, minuteFromEnd,secondsFromEnd;

            components = [[NSCalendar currentCalendar] components: NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute fromDate: currDate toDate: StartDate options: 0];
            hours = [components hour];
            minutesfromStart = [ components minute];

            components2 = [[NSCalendar currentCalendar] components: NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute fromDate: currDate toDate: EndDate options: 0];

            minuteFromEnd = [ components2 minute];
            secondsFromEnd = [ components2 second];

            NSDateComponents *components1;
            NSInteger hours1, minutes1, Seconds1;

            components1 = [[NSCalendar currentCalendar] components: NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond fromDate: currDate toDate: EndDate options: 0];
            hours1 = [components1 hour];
            minutes1 = [ components1 minute];
            Seconds1 = [ components1 second];

            currMinute = minutes1;
            currHours = hours1;
            currSeconds =Seconds1;

            NSLog(@"Time left is %ld:%ld:%ld", (long)hours1, (long)minutes1,(long)Seconds1);

            timer=[NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timerFired) userInfo:nil repeats:YES];

            cell.dynamicTimerLabel.text =[NSString stringWithFormat:@"%02ld:%02ld:%02ld",currHours,currMinute, currSeconds];

        }

        if(indexPath.row == 2)
        {
            currDate = [NSDate date];
            NSDateFormatter *dateFormatter=[[NSDateFormatter alloc] init];
            [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss a"];
            NSLog(@"the current date and time is %@",currDate);

            NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
            [dateFormat setDateFormat:@"YYYY-MM-dd hh:mm:ss a"];
            NSString *fxdDate = @"2018-05-16 07:00:00 a";
            NSDate *StartDate = [ dateFormat dateFromString:[ NSString stringWithFormat:@"%@", fxdDate]];

            NSString *dynDate = @"2018-05-17 11:00:00 p";

            EndDate = [dateFormat dateFromString:dynDate];
            NSDateComponents *components, *components2;
            NSInteger hours, minutesfromStart, minuteFromEnd,secondsFromEnd;

            components = [[NSCalendar currentCalendar] components: NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute fromDate: currDate toDate: StartDate options: 0];
            hours = [components hour];
            minutesfromStart = [ components minute];

            components2 = [[NSCalendar currentCalendar] components: NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute fromDate: currDate toDate: EndDate options: 0];

            minuteFromEnd = [ components2 minute];
            secondsFromEnd = [ components2 second];

            NSDateComponents *components1;
            NSInteger hours1, minutes1, Seconds1;

            components1 = [[NSCalendar currentCalendar] components: NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond fromDate: currDate toDate: EndDate options: 0];
            hours1 = [components1 hour];
            minutes1 = [ components1 minute];
            Seconds1 = [ components1 second];

            currMinute = minutes1;
            currHours = hours1;
            currSeconds =Seconds1;

            NSLog(@"Time left is %ld:%ld:%ld", (long)hours1, (long)minutes1,(long)Seconds1);



         timer=[NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timerFired) userInfo:nil repeats:YES];



             cell.dynamicTimerLabel.text =[NSString stringWithFormat:@"%02ld:%02ld:%02ld",currHours,currMinute, currSeconds];
        }

        if(indexPath.row == 3)
        {
            currDate = [NSDate date];
            NSDateFormatter *dateFormatter=[[NSDateFormatter alloc] init];
            [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss a"];
            NSLog(@"the current date and time is %@",currDate);

            NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
            [dateFormat setDateFormat:@"YYYY-MM-dd hh:mm:ss a"];
            NSString *fxdDate = @"2018-05-16 07:00:00 a";
            NSDate *StartDate = [ dateFormat dateFromString:[ NSString stringWithFormat:@"%@", fxdDate]];

            NSString *dynDate = @"2018-05-18 02:00:00 a";

            EndDate = [dateFormat dateFromString:dynDate];
            NSDateComponents *components, *components2;
            NSInteger hours, minutesfromStart, minuteFromEnd,secondsFromEnd;

            components = [[NSCalendar currentCalendar] components: NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute fromDate: currDate toDate: StartDate options: 0];
            hours = [components hour];
            minutesfromStart = [ components minute];

            components2 = [[NSCalendar currentCalendar] components: NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute fromDate: currDate toDate: EndDate options: 0];

            minuteFromEnd = [ components2 minute];
            secondsFromEnd = [ components2 second];

            NSDateComponents *components1;
            NSInteger hours1, minutes1, Seconds1;

            components1 = [[NSCalendar currentCalendar] components: NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond fromDate: currDate toDate: EndDate options: 0];
            hours1 = [components1 hour];
            minutes1 = [ components1 minute];
            Seconds1 = [ components1 second];

            currMinute = minutes1;
            currHours = hours1;
            currSeconds =Seconds1;

            NSLog(@"Time left is %ld:%ld:%ld", (long)hours1, (long)minutes1,(long)Seconds1);

            timer=[NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timerFired) userInfo:nil repeats:YES];

             cell.dynamicTimerLabel.text =[NSString stringWithFormat:@"%02ld:%02ld:%02ld",currHours,currMinute, currSeconds];
        }

        if(indexPath.row == 4)
        {
            currDate = [NSDate date];
            NSDateFormatter *dateFormatter=[[NSDateFormatter alloc] init];
            [dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss a"];
            NSLog(@"the current date and time is %@",currDate);

            NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
            [dateFormat setDateFormat:@"YYYY-MM-dd hh:mm:ss a"];
            NSString *fxdDate = @"2018-05-16 07:00:00 a";
            NSDate *StartDate = [ dateFormat dateFromString:[ NSString stringWithFormat:@"%@", fxdDate]];

            NSString *dynDate = @"2018-05-18 4:00:00 a";

            EndDate = [dateFormat dateFromString:dynDate];
            NSDateComponents *components, *components2;
            NSInteger hours, minutesfromStart, minuteFromEnd,secondsFromEnd;

            components = [[NSCalendar currentCalendar] components: NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute fromDate: currDate toDate: StartDate options: 0];
            hours = [components hour];
            minutesfromStart = [ components minute];

            components2 = [[NSCalendar currentCalendar] components: NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute fromDate: currDate toDate: EndDate options: 0];

            minuteFromEnd = [ components2 minute];
            secondsFromEnd = [ components2 second];

            NSDateComponents *components1;
            NSInteger hours1, minutes1, Seconds1;

            components1 = [[NSCalendar currentCalendar] components: NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute|NSCalendarUnitSecond fromDate: currDate toDate: EndDate options: 0];
            hours1 = [components1 hour];
            minutes1 = [ components1 minute];
            Seconds1 = [ components1 second];

            currMinute = minutes1;
            currHours = hours1;
            currSeconds =Seconds1;

            NSLog(@"Time left is %ld:%ld:%ld", (long)hours1, (long)minutes1,(long)Seconds1);


            timer=[NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(timerFired) userInfo:nil repeats:YES];

             cell.dynamicTimerLabel.text =[NSString stringWithFormat:@"%02ld:%02ld:%02ld",currHours,currMinute, currSeconds];
        }



-(void)timerFired

{

if(( currHours>=0 || currMinute >=0 || currSeconds>=0) && currSeconds>=0)
    {
        if(currSeconds==0 && currMinute>0)
        {
            currMinute-=1;
            currSeconds=59;
        }
        else if(currMinute==0 && currHours>0)
        {
            currHours-=1;
            currMinute=59;
        }
        else if(currSeconds>=0)
        {
            currSeconds-=1;
        }
        if(currSeconds>-1)
            time=[NSString stringWithFormat:@"%02ld:%02ld:%02ld",currHours,currMinute, currSeconds];
            [tableview reloadData];

    }


    else
    {
        [timer invalidate];
    }

}

У меня это сработало

Answer 3

Вам необходимо запланировать повторный запуск метода через 1 секунду.И поместите объект currentIndex на глобальный уровень и увеличивайте его всякий раз, когда выполняется метод таймера.

@interface YourCellClass(){
    NSInteger currentTimerIndex;
    NSTimer *timer;
    NSArray *arrayOfTimes;
    BOOL isTimerCompleted;
}
@property (strong, nonatomic) NSString *dateString;
@end
@implementation YourCellClass
-(void)layoutSubviews {
    [super layoutSubviews];
    //This line will call startTimer function after every 1 second.
    if (!isTimerCompleted && timer == nil) {
        timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(startTimer) userInfo:nil repeats:YES];
    }
}
-(void)startTimer {

    // dateString should be assign from you cellForRowAtIndexPath method like this
    //cell.dateString = [dateArray objectAtIndexPath:indexPath];


    //Suppose you have pass 16/5/2018 9:12:45 as dateString
    //So below i am checking how much is the difference between providedDate and currentDate with respect to (hours, minuts and seconds)
    // if all get zero it means both dates have become equal so i am disabling the timer.
    // In real scenario its like your order delivery has been set to 9:12:45 and its 8:59:45 now so you have
    // 0 hours 13 minuts and 0 seconds
    // In the very next second your timer have
    // 0 hours 12 minutes and 59 seconds and so on.

    NSDateFormatter *dateFormat = [[NSDateFormatter alloc] init];
    [dateFormat setDateFormat:@"YYYY-MM-dd hh:mm:ss a"];
    NSString *fxdDate = @"2018-05-16 07:00:00 a";
    NSDate *date = [ dateFormat dateFromString:self.dateString];


    NSDateComponents *components = [[NSCalendar currentCalendar] components: NSCalendarUnitDay|NSCalendarUnitHour|NSCalendarUnitMinute fromDate: NSDate.date toDate: date options: 0];
    if (components.hour == 0 && components.minute == 0 && components.second == 0) {
        [timer invalidate];
        isTimerCompleted = YES;
    }else {
        NSString *newTimeString = [NSString stringWithFormat:@"%ld : %ld : %ld",components.hour,components.minute,components.second];
        //
    }
}