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POUITableView experiences choppy scrolling when cell has a UIImageView subview
 

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  1. POUITableView experiences choppy scrolling when cell has a UIImageView subview
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    <p>This has been driving me crazy for the better part of the day.</p> <p>I've got a UITableView with UIImageViews. These imageviews load a locally saved PNG-file in the cellForRow-function of the tableview, and this works fine except the tableview will stop scrolling for a fraction of a second when a cell with an image in it scrolls into sight so to speak. I've trawled StackOverflow and google for an answer but I've come up short - so any help will be greatly appreciated.</p> <p>Here is my code for the CellForRow-function:</p> <pre><code>- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"MyIdentifier"]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"MyIdentifier"] autorelease]; cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; } if([currSection isEqualToString:@"composer"]){ MySlide *s = [slidesArray objectAtIndex:indexPath.row]; cell.textLabel.hidden = YES; UIImageView *whiteView = [[UIImageView alloc] initWithFrame:CGRectMake((projectsTable.frame.size.width/2)-150, 4, 204.8, 153.6)]; if([s.slideImage isEqualToString:@""] || s.slideImage == nil){ //no custom image in this cell - go with default background image whiteView.image = [UIImage imageNamed:@"cellback2.png"]; whiteView.backgroundColor = [UIColor whiteColor]; }else{ cell.layer.shouldRasterize = YES; cell.layer.rasterizationScale = [UIScreen mainScreen].scale; NSData *data = [[NSData alloc] initWithContentsOfFile:s.slideImage]; UIImage *im = [[UIImage alloc] initWithData:data]; whiteView.image = im; whiteView.image = [self imageWithImage:whiteView.image CovertToSize:CGSizeMake(204.8,153.6)]; whiteView.backgroundColor = [UIColor whiteColor]; } [cell.contentView addSubview:whiteView]; [whiteView release]; cell.accessoryType = UITableViewCellAccessoryNone; } return cell; } </code></pre>
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    1. USStephen Darlington
    1. USPinkFloydRocks
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      1. VTUpMod
    1. COthis is happening cause each time its creating a new cell, alloc a imageview, formating and adding..
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      1. POUITableView experiences choppy scrolling when cell has a UIImageView subview
      1. USvishy
    2. COI forgot to mention that I've tried to set up whiteBack inside the if(cell == nil) statement, but Ive not been able to update the imageview's image when adding a new image path to the slide object. Could you please give me a simple example of how you would solve this?
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      1. USPinkFloydRocks
    3. COcheck my code in answer, i have updated..
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      1. USvishy
 

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