UITableView Stuck UIButton을 클릭 할 때

Question

UITableView을 구현하는 데 문제가 있습니다. 각 셀에는 UIImageView, UILabel이 있습니다. JSON을 사용하여 웹 서비스에서 데이터를 검색 할 때 지연로드가 사용됩니다.

하위보기 (예 : UIView)를 제거하고 TableView의 크기를 조정해야하는 버튼이 있습니다.

내 문제는 단추를 클릭하면 UITableView의 스크롤이 느려지 게된다는 것입니다. 내 응용 프로그램을 프로파일 링하면 UITableView의 UIImageView에서 누수가 표시됩니다.

여기 jQuery과 내 코드,

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{ 

    static NSString *cellId = @"Cell"; 
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellId]; 

    UIActivityIndicatorView *activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray]; 
    activityIndicator.color = [UIColor blueColor]; 

    if (cell == nil){ 
     cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:nil]; 
     cell.selectionStyle = UITableViewCellSelectionStyleBlue; 

     if (lblTitle==nil){ 
      lblTitle =[[UILabel alloc]init]; 
     } 
     if (thumbnailImage==nil){ 
      thumbnailImage = [[UIImageView alloc]init]; 
     } 
    } 

    [cell addSubview:lblTitle]; 
    [cell addSubview:thumbnailImage]; 

// set frames for table view cell 
    if ([[UIDevice currentDevice]userInterfaceIdiom]==UIUserInterfaceIdiomPhone){ 

     lblTitle.frame = CGRectMake(110, 0, 210, 100); 
     thumbnailImage.frame = CGRectMake(5, 5, 100, 90); 
     activityIndicator.frame = CGRectMake(40, 30, 35, 35); 
     lblTitle.font = [UIFont fontWithName:@"Papyrus" size:16.0f]; 
    }else{ 

     lblTitle.frame = CGRectMake(215, 0, 590, 150); 
     lblTitle.font = [UIFont fontWithName:@"Papyrus" size:25.0f]; 
     thumbnailImage.frame = CGRectMake(5, 5, 200, 140); 
     activityIndicator.frame = CGRectMake(85, 45, 75, 75); 
    } 

    lblTitle.numberOfLines = 2; 
    lblTitle.textColor = [UIColor colorWithRed:105/255.0f green:205/255.0f blue:220/255.0f alpha:1.0f]; 
    lblTitle.backgroundColor = [UIColor clearColor]; 

    thumbnailImage.tag = indexPath.row; 

    // display data 
    lblTitle.text = [[rssNewsArray objectAtIndex:indexPath.row] objectForKey:@"title"]; 

    //lazy loding of images 
    DataContainer *currentContainer; 

    if (profImageDataContainer.count!=0) 
     currentContainer= [profImageDataContainer objectAtIndex:indexPath.row]; 

    if(currentContainer.cellImage) 
     thumbnailImage.image = currentContainer.cellImage; 
    else{ 
     //checking whether thumbnail is null 
     if (![[[rssNewsArray objectAtIndex:indexPath.row] objectForKey:@"image"] isKindOfClass:[UIImage class]]) 
     { 

      if ([self checkNetworkStatus:nil]){ 

       if(![[[rssNewsArray objectAtIndex:indexPath.row] objectForKey:@"thumbnail"] isEqualToString:@""] && ([[[rssNewsArray objectAtIndex:indexPath.row] objectForKey:@"thumbnail"] rangeOfString:@".jpg"].location!=NSNotFound || [[[rssNewsArray objectAtIndex:indexPath.row] objectForKey:@"thumbnail"] rangeOfString:@".jpeg"].location!=NSNotFound || [[[rssNewsArray objectAtIndex:indexPath.row] objectForKey:@"thumbnail"] rangeOfString:@".png"].location!=NSNotFound)) 
       { 

        activityIndicator.tag = indexPath.row; 

        // Start it animating and add it to the view 
        [activityIndicator startAnimating]; 
        [cell addSubview:activityIndicator]; 
        NSString *urlstr = [[rssNewsArray objectAtIndex:indexPath.row] objectForKey:@"thumbnail"]; 
        urlstr = [urlstr stringByReplacingOccurrencesOfString:@" " withString:@"%20"]; 

        NSURL *imgURL = [NSURL URLWithString:urlstr]; 

        thumbnailImage.image=[UIImage imageNamed:@"albumsPlaceHolder.png"]; 

        NSMutableArray *array = [[NSMutableArray alloc]initWithObjects:imgURL,[NSString stringWithFormat:@"%d", indexPath.row],activityIndicator,thumbnailImage, nil]; 

        [self performSelectorInBackground:@selector(loadImageInBackground:) withObject:array]; 

       }else 
       { 
        thumbnailImage.image=[UIImage imageNamed:@"albumsPlaceHolder.png"]; 
       } 
      } 
      else 
      { 
       thumbnailImage.image=[UIImage imageNamed:@"albumsPlaceHolder.png"]; 
      } 
     } 
     else 
     { 
      thumbnailImage.image=[[rssNewsArray objectAtIndex:indexPath.row] objectForKey:@"image"]; 

     } 
     } 
     thumbnailImage=nil; 
     lblTitle=nil; 
     activityIndicator=nil; 
     return cell; 
} 

버튼 액션 미리

- (IBAction)actCloseTicker:(id)sender 
{ 

    [self.ticker pause]; 
    self.ticker=nil; 
    NSUserDefaults *def = [NSUserDefaults standardUserDefaults]; 
    [def setBool:NO forKey:@"ticker"]; 
    [def synchronize]; 
    def=nil; 

    [self.tickerView removeFromSuperview]; 

    if ([[UIDevice currentDevice]userInterfaceIdiom]==UIUserInterfaceIdiomPhone) 
    { 
     self.tblRSSNews.frame = CGRectMake(0, 0, 320, self.view.frame.size.height); 
    } 
    else 
    { 
     self.tblRSSNews.frame = CGRectMake(0, 0, 768, self.view.frame.size.height); 
    } 
    } 

감사합니다.

Answer 1

게시 된 코드에 따라 reuseIdentifier:nil이라는 셀을 할당하기 때문에 tableView가 만들어진 셀을 재사용하지 않았습니다. 즉, 새 셀을 표시해야 할 때마다 새 셀을 할당하고 새 인스턴스를 추가합니다. label 및 imageView를 사용하면 느려질 수 있습니다. 다음과 같이 코드를 변경해보십시오 :

UILabel *lblTitle = nil; 
UIImageView *thumbnailImage = nil; 
if (cell == nil){ 
    cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellId ]; 
    cell.selectionStyle = UITableViewCellSelectionStyleBlue; 

    if (lblTitle==nil){ 
     lblTitle =[[UILabel alloc]init]; 
     lblTitle.tag = 1000; 
    } 
    if (thumbnailImage==nil){ 
     thumbnailImage = [[UIImageView alloc]init]; 
     thumbnailImage.tag = 1001; 
    } 
     [cell addSubview:lblTitle]; 
     [cell addSubview:thumbnailImage]; 
} 
else{ 
    lblTitle = (UILabel*)[cell viewWithTag:1000]; 
    thumbnailImage = (UIImageView*)[cell viewWithTag:1001]; 
}