我正在将 iOS5 项目更新到 storybaord 并兼容 iOS6 / iOS7 运行。我的表格视图有 4 个部分，每个部分都有不同长度的数据，这些数据可能显示为一行，也可能不显示为一行。
旧代码是这样的，我收到声明的警告
CGSize size = [productToShow.pDesc sizeWithFont:self.lblHidden.font constrainedToSize:self.lblHidden.frame.size lineBreakMode:NSLineBreakByWordWrapping];
警告
sizeWithFont:constrainedToSize:lineBreakMode:is first deprecated in iOS7
所以我尝试使用boundingRectWithSize:options:attributes:context:按照编译器的建议使用。
但代码似乎更复杂：苹果不会让更简单的事情变得困难。如果有人可以看到我的代码并提出最佳方法或更好更简单的方法，那将对我和社区大有帮助。
带有 XIB 的 iOS5 代码
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (indexPath.section == 0)
{
NSString *tempPointStr = [self.shortDescArray objectAtIndex:indexPath.row];
self.lblHidden.frame = CGRectMake(58, 0, 945, 9999);
self.lblHidden.text = tempPointStr;
CGSize size = [tempPointStr sizeWithFont:self.lblHidden.font
constrainedToSize:self.lblHidden.frame.size
lineBreakMode:NSLineBreakByWordWrapping];
if (size.height < 50.0f)
{
return 50.0f;
}
else
{
return size.height;
}
}
elseif(indexPath.section == 1)
{
...
}
else
{
...
}
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (indexPath.section == 0)
{
static NSString *tempPoint = @"ProductPointsCell";
ProductPointsCell *cell = (ProductPointsCell*)[tableView dequeueReusableCellWithIdentifier:tempPoint];
if (cell == nil)
{
NSArray* nib = [[NSBundle mainBundle] loadNibNamed:@"ProductPointsCell_iPad" owner:self options:nil];
cell = [nib objectAtIndex:0];
cell.showsReorderControl = NO;
cell.selectionStyle = UITableViewCellSelectionStyleNone;
cell.backgroundColor=[UIColor clearColor];
cell.lblPoint.font = [UIFont fontWithName:@"Arial-BoldMT" size:18.0f];
}
NSString *tempPointStr = [self.shortDescArray objectAtIndex:indexPath.row];
cell.lblPoint.text = tempPointStr;
self.lblHidden.frame = CGRectMake(58, 0, 945, 9999);
self.lblHidden.text = tempPointStr;
CGSize size = [tempPointStr sizeWithFont:self.lblHidden.font
constrainedToSize:self.lblHidden.frame.size
lineBreakMode:NSLineBreakByWordWrapping];
if (size.height < 50.0f)
{
cell.lblPoint.frame = CGRectMake(58, 0, 945, 50.0f);
}
else
{
cell.lblPoint.frame = CGRectMake(58, 0, 945, size.height);
}
return cell;
}
elseif(indexPath.section == 1)
{
...
}
else
{
...
}
}
其中与中的相同代码：
iOS6/7 代码与故事板
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (indexPath.section == 0)
{
NSString *tempPointStr = (self.shortDescArray)[indexPath.row];
self.lblHidden.frame = CGRectMake(58, 0, 945, 9999);
self.lblHidden.text = tempPointStr;
CGSize constraint = CGSizeMake(945, 9999.0f);
NSDictionary * attributes = [NSDictionary dictionaryWithObject:[UIFont systemFontOfSize:14.0f] forKey:NSFontAttributeName];
NSAttributedString *attributedText = [[NSAttributedString alloc]initWithString:self.lblHidden.text attributes:attributes];
CGRect rect = [attributedText boundingRectWithSize:constraint options:NSStringDrawingUsesLineFragmentOrigin context:nil];
CGSize size = rect.size;
if (size.height < 50.0f)
{
return 50.0f;
}
else
{
return size.height;
}
}
elseif(indexPath.section == 1)
{
...
}
else
{
...
}
}
-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
if (indexPath.section == 0)
{
static NSString *tempPoint = @"ProductPointsCell";
ProductPointsCell *cell = (ProductPointsCell*)[tableView dequeueReusableCellWithIdentifier:tempPoint];
cell.showsReorderControl = NO;
cell.selectionStyle = UITableViewCellSelectionStyleNone;
cell.backgroundColor=[UIColor clearColor];
cell.pointLbl.font = [UIFont fontWithName:@"Arial-BoldMT" size:18.0f];
[cell.pointLbl setLineBreakMode:NSLineBreakByWordWrapping];
[cell.pointLbl setNumberOfLines:0];
NSString *tempPointStr = (self.shortDescArray)[indexPath.row];
cell.pointLbl.text = tempPointStr;
CGSize constraint = CGSizeMake(945,9999.0f);
NSAttributedString *attributedText = [[NSAttributedString alloc]initWithString:cell.pointLbl.text attributes:@{NSFontAttributeName: [UIFont systemFontOfSize:17.0f]}];
CGRect rect = [attributedText boundingRectWithSize:constraint options:NSStringDrawingUsesLineFragmentOrigin context:nil];
CGSize size = rect.size;
if (size.height < 50.0f)
{
cell.pointLbl.frame = CGRectMake(58, 0, 945, 50.0f);
}
else
{
cell.pointLbl.frame = CGRectMake(58, 0, 945, size.height);
}
return cell;
}
elseif(indexPath.section == 1)
{
...
}
else
{
...
}
}
这些代码的目的是使数据在适合单行时显示在单行中，当不适合时，调整单元格高度并将数据显示为多行单元格。
如果我应该保持自动布局打开或关闭，以及在转换时是否应该在情节提要中设置任何参数，也请纠正我。
如果有人可以提出更好/更快和更简单的方法，请举例说明。