我遇到了tableview Cells滚动速度的问题。您可以看到它在出列并重新使用单元格时挂起。下面是我用来创建单元格的代码。我正在使用2个自定义单元格，如果有图像则使用一个单元格，如果用户没有附加图像则使用另一个单元格。任何见解将不胜感激。我还应该补充一点，我想在单元格之间添加一个空格，所以基本上我创建了一个包含单个单元格的新部分，这就是为什么你总是会在我的代码中看到indexPath.section。
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *imageCell = @"ShameImage";
static NSString *noImageCell = @"ShameNoImageCell";
static NSString *noCell = @"NoCell";
UITableViewCell *cell = [self.tableView dequeueReusableCellWithIdentifier:noCell];
if ([[blobID objectAtIndex:indexPath.section] isEqualToNumber:[NSNumber numberWithInt:1]])
{
ShameViewCell *cell = (ShameViewCell *)[self.tableView dequeueReusableCellWithIdentifier:imageCell];
if (cell == nil)
{
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"ShameImageCell" owner:self options:nil];
cell = [nib objectAtIndex:0];
CALayer *cellImageView = [cell.imageView layer];
[cellImageView setMasksToBounds:YES];
[cellImageView setCornerRadius:10.0];
IndicatorImageView *iiv = [[IndicatorImageView alloc] initWithFrame:CGRectMake(0, 0, 88, 88)];
[iiv setShameID:[[shameID objectAtIndex:indexPath.section] stringValue]];
iiv.tag = 999;
[iiv loadImageFromURL];
[cell.imageView addSubview:iiv];
cell.imageView.userInteractionEnabled = YES;
UITapGestureRecognizer *tapImage = [[UITapGestureRecognizer alloc]
initWithTarget:self action:@selector(openPicture:)];
tapImage.numberOfTapsRequired = 1;
[cell.imageView addGestureRecognizer:tapImage];
[cell.contentView.layer setCornerRadius:10];
[cell.contentView setBackgroundColor:[UIColor blackColor]];
[cell.contentView setAlpha:0.7f];
UIColor *insideColor = [UIColor colorWithRed:color_red green:color_green blue:color_blue alpha:1];
cell.lastShame.contentInset = UIEdgeInsetsMake(-11, -8, 0, 0);
[cell.lastShame setTextColor:insideColor];
[cell.lastShame setFont:[UIFont fontWithName:text_font_name size:14]];
cell.lastShame.text = [userShame objectAtIndex:indexPath.section];
[cell.shameDate setTextColor:insideColor];
[cell.shameDate setFont:[UIFont fontWithName:text_font_name size:11]];
cell.shameDate.text = [createDt objectAtIndex:indexPath.section];
[cell.userLabel setTextColor:insideColor];
[cell.userLabel setFont:[UIFont fontWithName:text_font_name size:11]];
cell.userLabel.text = [@"Post By: " stringByAppendingString:[userName objectAtIndex:indexPath.section]];
[cell.lastShame setBackgroundColor:[UIColor clearColor]];
return cell;
}
}else
{
ShameNoImage *cell = (ShameNoImage *)[self.tableView dequeueReusableCellWithIdentifier:noImageCell];
if (cell == nil)
{
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"ShameNoImageCell" owner:self options:nil];
cell = [nib objectAtIndex:0];
CALayer *cellImageView = [cell.imageView layer];
[cellImageView setMasksToBounds:YES];
[cellImageView setCornerRadius:10.0];
[cellImageView setBorderWidth:1.0];
[cellImageView setBorderColor:[[UIColor whiteColor] CGColor]];
[cell.contentView.layer setCornerRadius:10];
[cell.contentView setBackgroundColor:[UIColor blackColor]];
[cell.contentView setAlpha:0.7f];
UIColor *insideColor = [UIColor colorWithRed:color_red green:color_green blue:color_blue alpha:1];
cell.shameLabel.contentInset = UIEdgeInsetsMake(-11, -8, 0, 0);
[cell.shameLabel setTextColor:insideColor];
[cell.shameLabel setFont:[UIFont fontWithName:text_font_name size:14]];
cell.shameLabel.text = [userShame objectAtIndex:indexPath.section];
[cell.dateLabel setTextColor:insideColor];
[cell.dateLabel setFont:[UIFont fontWithName:text_font_name size:11]];
cell.dateLabel.text = [createDt objectAtIndex:indexPath.section];
[cell.userLabel setTextColor:insideColor];
[cell.userLabel setFont:[UIFont fontWithName:text_font_name size:11]];
cell.userLabel.text = [@"Post By: " stringByAppendingString:[userName objectAtIndex:indexPath.section]];
[cell.shameLabel setBackgroundColor:[UIColor clearColor]];
return cell;
}
}
return cell;
}
答案 0 :(得分：0)
跳出来的第一件事是对setCornerRadius的调用。一个快速的测试是削减角半径的东西，看看是否有助于你的速度。如果您遇到问题，则必须使用CG和UIBezierPath切换到绘图。
接下来要看的是透明度和您正在使用的子视图的数量。很难说出上面发布的内容，但是更多的子视图，尤其是alpha，意味着更多的工作合成。但根据您的设计，这可能很难解决，但使用CG绘图或使用图像可能有所帮助。
答案 1 :(得分：0)
我明白了。我正在重建和绘制每一个细胞。我需要在Cell的Subclass中设置reuseIdentifier，然后将表的构建更改为这样。
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *imageCell = @"ShameImage";
static NSString *noImageCell = @"ShameNoImageCell";
ShameViewCell *iCell = (ShameViewCell *)[self.tableView dequeueReusableCellWithIdentifier:imageCell];
ShameNoImage *niCell = (ShameNoImage *)[self.tableView dequeueReusableCellWithIdentifier:noImageCell];
if ([[blobID objectAtIndex:indexPath.section] isEqualToNumber:[NSNumber numberWithInt:1]])
{
if (iCell == nil)
{
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"ShameImageCell" owner:self options:nil];
iCell = [nib objectAtIndex:0];
CALayer *cellImageView = [iCell.imageView layer];
[cellImageView setMasksToBounds:YES];
IndicatorImageView *iiv = [[IndicatorImageView alloc] initWithFrame:CGRectMake(0, 0, 88, 88)];
[iiv setShameID:[[shameID objectAtIndex:indexPath.section] stringValue]];
iiv.tag = 999;
[iiv loadImageFromURL];
[iCell.imageView addSubview:iiv];
iCell.imageView.userInteractionEnabled = YES;
UITapGestureRecognizer *tapImage = [[UITapGestureRecognizer alloc]
initWithTarget:self action:@selector(openPicture:)];
tapImage.numberOfTapsRequired = 1;
[iCell.imageView addGestureRecognizer:tapImage];
[iCell.contentView setBackgroundColor:[UIColor blackColor]];
[iCell.contentView setAlpha:0.7f];
UIColor *insideColor = [UIColor colorWithRed:color_red green:color_green blue:color_blue alpha:1];
iCell.lastShame.contentInset = UIEdgeInsetsMake(-11, -8, 0, 0);
[iCell.lastShame setTextColor:insideColor];
[iCell.lastShame setFont:[UIFont fontWithName:text_font_name size:14]];
iCell.lastShame.text = [userShame objectAtIndex:indexPath.section];
[iCell.shameDate setTextColor:insideColor];
[iCell.shameDate setFont:[UIFont fontWithName:text_font_name size:11]];
iCell.shameDate.text = [createDt objectAtIndex:indexPath.section];
[iCell.userLabel setTextColor:insideColor];
[iCell.userLabel setFont:[UIFont fontWithName:text_font_name size:11]];
iCell.userLabel.text = [@"Post By: " stringByAppendingString:[userName objectAtIndex:indexPath.section]];
return iCell;
}else
{
[[iCell.imageView viewWithTag:999] removeFromSuperview];
IndicatorImageView *iiv = [[IndicatorImageView alloc] initWithFrame:CGRectMake(0, 0, 88, 88)];
[iiv setShameID:[[shameID objectAtIndex:indexPath.section] stringValue]];
iiv.tag = 999;
[iiv loadImageFromURL];
[iCell.imageView addSubview:iiv];
iCell.lastShame.text = [userShame objectAtIndex:indexPath.section];
iCell.shameDate.text = [createDt objectAtIndex:indexPath.section];
iCell.userLabel.text = [@"Post By: " stringByAppendingString:[userName objectAtIndex:indexPath.section]];
return iCell;
}
}else
{
if (niCell == nil)
{
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"ShameNoImageCell" owner:self options:nil];
niCell = [nib objectAtIndex:0];
[niCell.contentView setBackgroundColor:[UIColor blackColor]];
[niCell.contentView setAlpha:0.7f];
UIColor *insideColor = [UIColor colorWithRed:color_red green:color_green blue:color_blue alpha:1];
niCell.shameLabel.contentInset = UIEdgeInsetsMake(-11, -8, 0, 0);
[niCell.shameLabel setTextColor:insideColor];
[niCell.shameLabel setFont:[UIFont fontWithName:text_font_name size:14]];
niCell.shameLabel.text = [userShame objectAtIndex:indexPath.section];
[niCell.dateLabel setTextColor:insideColor];
[niCell.dateLabel setFont:[UIFont fontWithName:text_font_name size:11]];
niCell.dateLabel.text = [createDt objectAtIndex:indexPath.section];
[niCell.userLabel setTextColor:insideColor];
[niCell.userLabel setFont:[UIFont fontWithName:text_font_name size:11]];
niCell.userLabel.text = [@"Post By: " stringByAppendingString:[userName objectAtIndex:indexPath.section]];
return niCell;
}else
{
niCell.shameLabel.text = [userShame objectAtIndex:indexPath.section];
niCell.dateLabel.text = [createDt objectAtIndex:indexPath.section];
niCell.userLabel.text = [@"Post By: " stringByAppendingString:[userName objectAtIndex:indexPath.section]];
return niCell;
}
}
return niCell;
}