如何在iphone中的单元格上显示倒数计时器？

Question

**当我长按单元格时，我在单元格上显示倒计时器。但问题是，当我点击行计时器启动但突然当我点击前一单元的第二单元计时器停止并启动计时器新单元格时我点击，但我需要的主要功能是我必须显示运行前一个计时器和当前计时器。请任何人给我正确的方法。**

 -(void)handleLongPress:(UILongPressGestureRecognizer *)gestureRecognizer
 { AppDelegate *app=(AppDelegate *)[UIApplication sharedApplication].delegate;
   CGPoint p = [gestureRecognizer locationInView:ChatTable];
    NSIndexPath *indexPath = [ChatTable indexPathForRowAtPoint:p];


if ([[[userArray valueForKey:@"sender_id"] objectAtIndex:indexPath.row]isEqualToString: app.userId]) {

}

else{

    if (gestureRecognizer.state == UIGestureRecognizerStateBegan)
    {

        if ([imageCache objectForKey:[NSString stringWithFormat:@"%d",indexPath.row]]==NULL) {

        }
        else
        {
            self.picId=[[userArray valueForKey:@"pic_id"] objectAtIndex:indexPath.row];
            self.imageName=[[userArray valueForKey:@"imagename"] objectAtIndex:indexPath.row];
            ChatTable.userInteractionEnabled=NO;
            // self.navigationController.navigationBarHidden=YES;
            image=[[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 320, 480)];
            self.pickerValue=[[userArray valueForKey:@"seconds"] objectAtIndex:indexPath.row];
            image.image=[imageCache objectForKey:[NSString stringWithFormat:@"%d",indexPath.row]];
            [self.view addSubview:image];
            [self showTableTime:indexPath];
        }
    }
    else if (gestureRecognizer.state == UIGestureRecognizerStateEnded) {
        UITableViewCell * myCell = [ChatTable cellForRowAtIndexPath:indexpathForTimer];
        UILabel * myLabel = (UILabel *)[myCell viewWithTag:101];
        myLabel.text=@"";
        //  self.navigationController.navigationBarHidden=NO;
        [image removeFromSuperview];
    }

}

}

-(void)showTableTime:(NSIndexPath *)indexPath
 {
  secondsLeft=[self.pickerValue integerValue];
   indexpathForTimer=indexPath;
   [self countDownTimer];

 }

- (void)countDownTimer {

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

   }
   - (void)updateCounter:(NSTimer *)theTimer {

UITableViewCell * myCell = [ChatTable cellForRowAtIndexPath:indexpathForTimer];
UILabel * myLabel = (UILabel *)[myCell viewWithTag:101];
if (secondsLeft >0) {
    secondsLeft --;
    UILabel * myLabel = (UILabel *)[myCell viewWithTag:101];
    myLabel.text=[NSString stringWithFormat:@"0%d",secondsLeft];

}
else if(secondsLeft==0)
{
    [self.image removeFromSuperview];
    [timer invalidate];
    ChatTable.userInteractionEnabled=YES;
    myLabel.text=@"";
    [self SendRequsetToServerOfSeenImage];

}
else
{
}


}

Answer 1

试试这个

- (void)countDownTimer 
{

timer =[NSTimer scheduledTimerWithTimeInterval:1.0 target:self           selector:@selector(updateCounter:) userInfo:nil repeats:YES];
[[NSRunLoop mainRunLoop]addTimer:timer forMode:NSRunLoopCommonModes];

 }  

Answer 2

问题是您只存储一个计时器/索引路径对（您只使用变量“timer”和“indexPathForTimer”）。一旦激活第二个单元格，变量indexPathForTimer将被第二个单元格的indexPath覆盖，因此您只更新第二个单元格。

我建议您将变量计时器转换为NSMutableArray并将indexPathForTimer转换为NSMapTable，然后执行

// code to init the map table, perform this where you initialize your variables
// (you may want to use weakToStrong or weakToWeak depending on your memory
// management)
indexPathForTimer = [NSMapTable strongToStrongObjectsMapTable];

// use this code to create your timer instance with reference to the index path
// for which it was instantiated
NSTimer* newTimer = [NSTimer timerWithTimerInterval:1.0 target:self selector:@selector(updateCounter:) userInfo:nil repeats:YES];
[timer addObject:newTimer];
[indexPathForTimer addObject:indexPath forKey:newTimer];
[NSRunLoop mainRunLoop] addTimer:newTimer forModes:NSRunLoopCommonModes];

在updateCounter：方法中，您可以获得真正的索引路径，如此

currentIndexPath = [indexPathForTimer objectForKey:theTimer];

Answer 3

我认为你想在视图或每个单元格上运行多个计时器。但处理在不同单元上运行的多个计时器变得很复杂。