如何优化cellForRowAtIndexPath:代码
如何优化cellForRowAtIndexPath:代码
提问于 2013-05-30 18:24:10
在向一些路径添加字体和阴影后，我注意到当视图从堆栈中弹出时，表视图动画会滞后(像FB/ UILabels使用的侧扫)。侧扫是平滑的，直到我添加了UILabel阴影。
我想我可能把它添加到了错误的位置，所以标签属性可能被错误地添加了。请看下面的cellForRowAtIndexPath:方法：
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString * cellReuseIdentifier = @"cellReuseIdentifier";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellReuseIdentifier];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellReuseIdentifier];
}
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 2, self.view.bounds.size.width, 200)];
imageView.image = [UIImage imageNamed:@"rest.jpg"];
[cell.contentView addSubview:imageView];
UILabel *titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 2, 320, 30)];
titleLabel.text = (NSString *)[[publicDataArray objectAtIndex:indexPath.row] objectForKey:@"title"];
titleLabel.backgroundColor = [UIColor clearColor];
titleLabel.textColor = [UIColor whiteColor];
[titleLabel setFont:[UIFont fontWithName:@"HelveticaNeue" size:24]];
titleLabel.layer.shadowColor = [[UIColor whiteColor] CGColor];
titleLabel.layer.shadowOpacity = 0.7;
[cell.contentView addSubview:titleLabel];
UILabel *detailLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 160, cell.bounds.size.width, 30)];
detailLabel.text = (NSString *)[[publicDataArray objectAtIndex:indexPath.row] objectForKey:@"description"];
detailLabel.backgroundColor = [UIColor clearColor];
detailLabel.textColor = [UIColor whiteColor];
[detailLabel setFont:[UIFont fontWithName:@"HelveticaNeue" size:18]];
detailLabel.layer.shadowColor = [[UIColor whiteColor] CGColor];
detailLabel.layer.shadowOpacity = 0.7;
[cell.contentView addSubview:detailLabel];
cell.contentView.backgroundColor = [UIColor clearColor];
return cell;
}谢谢你的帮助。
Stack Overflow用户
发布于 2013-05-30 18:31:51
使用以下代码替换您的代码：
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString * cellReuseIdentifier = @"cellReuseIdentifier";
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:cellReuseIdentifier];
if (cell == nil)
{
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellReuseIdentifier];
UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 2, self.view.bounds.size.width, 200)];
imageView.image = [UIImage imageNamed:@"rest.jpg"];
imageView.tag =1;
[cell.contentView addSubview:imageView];
UILabel *titleLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 2, 320, 30)];
titleLabel.text = (NSString *)[[publicDataArray objectAtIndex:indexPath.row] objectForKey:@"title"];
titleLabel.backgroundColor = [UIColor clearColor];
titleLabel.tag = 2;
titleLabel.textColor = [UIColor whiteColor];
[titleLabel setFont:[UIFont fontWithName:@"HelveticaNeue" size:24]];
titleLabel.layer.shadowColor = [[UIColor whiteColor] CGColor];
titleLabel.layer.shadowOpacity = 0.7;
[cell.contentView addSubview:titleLabel];
UILabel *detailLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 160, cell.bounds.size.width, 30)];
detailLabel.tag = 3;
detailLabel.text = (NSString *)[[publicDataArray objectAtIndex:indexPath.row] objectForKey:@"description"];
detailLabel.backgroundColor = [UIColor clearColor];
detailLabel.textColor = [UIColor whiteColor];
[detailLabel setFont:[UIFont fontWithName:@"HelveticaNeue" size:18]];
detailLabel.layer.shadowColor = [[UIColor whiteColor] CGColor];
detailLabel.layer.shadowOpacity = 0.7;
}
UIImageView *tempImgView = (UIImageView *)[cell viewWithTag:1];
tempImgView.image = [UIImage imageNamed:@""];// Here you can set any image by reusing imageview without allocating again and again
UILabel *tempLabel;
tempLabel = (UILabel *)[cell viewWithTag:2];
tempLabel.text = @"";// Here you can access your title label and can set its properties without allocating again
tempLabel = (UILabel *)[cell viewWithTag:3];
tempLabel.text = @"";// Here you can access your detailLabel label and can set its properties without allocating again
[cell.contentView addSubview:detailLabel];
cell.contentView.backgroundColor = [UIColor clearColor];
return cell;
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/16833688
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