我有一个带有两个堆叠标签的原型单元格，后跟一个包含最多三个按钮的视图。对于任何给定的单元格（基于 web xml 文件），可以看到 0、1、2 或 3 个按钮。我希望布局如下（X 代表按钮）
3 个按钮
| |
| X X X |
| |
2 个按钮
| |
| X X |
| |
1 个按钮
| |
| X |
| |
我的表格单元格代码根据单元格中的按钮总数设置每个按钮的框架。然而，在第二次加载单元格之前，框架似乎确实有效（即滚动，使单元格超出范围，然后返回到它）。上次发生这种情况是由于布局限制。问题是，我如何在情节提要中设置约束以允许每个按钮位于多个位置？目前，每个按钮都固定在按钮视图的顶部、底部和前缘。我知道前沿约束导致了这个问题，但不确定使用什么来代替故事板强制它。或者我可以在我的 cellForRowAtIndexPath 方法中做些什么？这是该方法的相关代码
static NSString *CellIdentifier = @"localdiningTableCell";
mhgiLocalDiningCell *diningcell = (mhgiLocalDiningCell*)[tableView
dequeueReusableCellWithIdentifier:CellIdentifier];
if (diningcell == nil) {
diningcell = [[mhgiLocalDiningCell alloc]
initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:CellIdentifier];
}
mhgiDiningXmlObject *object = [self.xmlParser.allItems objectAtIndex:[indexPath row]];
CGSize constraintSize = CGSizeMake(280.0f, MAXFLOAT);
CGSize labelSize = [[object Name] sizeWithFont:diningcell.nameLabel.font constrainedToSize:constraintSize lineBreakMode:NSLineBreakByWordWrapping];
CGRect frame = CGRectMake (10, 10, 280.0f, labelSize.height);
diningcell.nameLabel.frame = frame;
diningcell.nameLabel.lineBreakMode = NSLineBreakByWordWrapping;
diningcell.nameLabel.numberOfLines = 0;
diningcell.nameLabel.text= [object Name];
CGFloat nextYVal = diningcell.nameLabel.frame.origin.y + diningcell.nameLabel.frame.size.height + 10.0f;
NSString *descrText = @"";
if (![[object Type] isEqualToString:@""]){
descrText = [descrText stringByAppendingString:[object Type]];
descrText = [descrText stringByAppendingString:@"\n"];
}
descrText = [descrText stringByAppendingString:[NSString stringWithFormat:@"%@, %@, %@", [object Street], [object City], [object State]]];
descrText = [descrText stringByAppendingString:@"\n"];
descrText = [descrText stringByAppendingString:[NSString stringWithFormat:@"%@ miles from the hotel", [object Distance]]];
labelSize = [descrText sizeWithFont:diningcell.typeLabel.font constrainedToSize:constraintSize lineBreakMode:NSLineBreakByWordWrapping];
frame = CGRectMake (10, nextYVal, 280.0f, labelSize.height);
diningcell.typeLabel.frame = frame;
diningcell.typeLabel.lineBreakMode = NSLineBreakByWordWrapping;
diningcell.typeLabel.numberOfLines = 0;
diningcell.typeLabel.text = descrText;
nextYVal += diningcell.typeLabel.frame.origin.y + diningcell.typeLabel.frame.size.height + 10.0f;
diningcell.ussite= [object UrbanSpoon];
diningcell.website= [object Website];
diningcell.dirsite= [object Maps];
NSMutableArray* buttons = [[NSMutableArray alloc] init];
[buttons removeAllObjects];
if ([[object Website] isEqualToString:@""]){
[diningcell.websiteButton setHidden:TRUE];
}
else
{
[diningcell.websiteButton setHidden:FALSE];
[buttons addObject:diningcell.websiteButton];
}
if ([[object UrbanSpoon] isEqualToString:@""]){
[diningcell.usButton setHidden:TRUE];
}
else
{
[diningcell.usButton setHidden:FALSE];
[buttons addObject:diningcell.usButton];
}
if ([[object Maps] isEqualToString:@""]){
[diningcell.dirButton setHidden:TRUE];
}
else
{
[diningcell.dirButton setHidden:FALSE];
[buttons addObject:diningcell.dirButton];
}
if (buttons.count == 1){
[[buttons objectAtIndex:0] setCenter:CGPointMake(150.0f, 25.0f)];
}
else if (buttons.count == 2){
[[buttons objectAtIndex:0] setCenter:CGPointMake(75.0f, 25.0f)];
[[buttons objectAtIndex:1] setCenter:CGPointMake(225.0f, 25.0f)];
}
else if (buttons.count == 3){
[[buttons objectAtIndex:0] setCenter:CGPointMake(75.0f, 25.0f)];
[[buttons objectAtIndex:1] setCenter:CGPointMake(150.0f, 25.0f)];
[[buttons objectAtIndex:2] setCenter:CGPointMake(225.0f, 25.0f)];
}
return diningcell;
更新 我创建了一个自定义视图来尝试解决布局问题。该视图仅包含四个按钮并将它们放置在 layoutviews 方法中。我在原型单元格中添加了自定义类的视图，并且布局似乎有效。但是，当我在滚动视图中更改方向（即向下然后向上，向上然后向下）时，一些单元格会未对齐。见下图。
