我想弄清楚这个问题已经有一段时间了:
我在 tableview 中有一个自定义单元格,它有两个标签,一个在另一个下面。顶部标签最多可以是一行或两行。底部标签仅限一行。
顶部标签将始终存在,但底部标签将存在于某些单元格中,而我不会存在于某些其他单元格中。
我需要一种方法来弄清楚如何将这些标签垂直居中排列。我尝试使用 cell.label1.numberOfLines = 0;
使顶部标签动态化,但是 label1 并没有真正限制为 2 行。
我试图通过计算第一个标签的高度然后将两个标签居中排列来使这些标签垂直居中。
如果我使用 xib 将行数限制为 2,那么第一个标签的高度总是计算为 2 行,即使标签占用 1 行。我经常看到的一个问题是,如果我使用 [cell.label1 sizeToFit];
然后在滚动表格时标签似乎总是会更改显示的文本。显示的文本始终用于相应的标签,但文本有时会在中途换行,有时会使用整行。
这是我的引用代码:
CustomCell1 *cell = (CustomCell1 *)[self.tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
if (cell == nil)
{
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"CustomCell1" owner:self options:nil];
cell = [nib objectAtIndex:0];
cell.label1.lineBreakMode = UILineBreakModeWordWrap;
cell.label1.numberOfLines = 0;
cell.label1.tag = [indexPath row];
}
cell.label1.text = [[responseArray objectAtIndex:[indexPath row]] text];
if([[[responseArray objectAtIndex:[indexPath row]] isDone] isEqualToString:@"N"]) {
cell.label2.text = @"";
} else {
cell.label2.text = @"Done";
}
//[cell.label1 sizeToFit];
CGSize label1Size = [cell.label1 frame].size;
CGFloat label1Height = label1Size.height;
CGRect label1Frame = cell.label1.frame;
int numLines = (int)(label1Height/cell.label1.font.leading);
CGSize label2Size = [cell.label2 frame].size;
CGFloat label2Height = label2Size.height;
CGRect label2Frame = cell.label2.frame;
if(numLines > 1) {
if([cell.label2.text isEqualToString:@""]) {
//if label2 == "" then center label1
label1Frame.origin.y = cellHeight/2 - label1Height/2;
cell.label1.frame = label1Frame;
} else {
label1Frame.origin.y = 12;
cell.label1.frame = label1Frame;
label2Frame.origin.y = 52;
cell.label2.frame = label2Frame;
}
} else {
if([cell.label2.text isEqualToString:@""]) {
CGRect frame = cell.label1.frame;
frame.origin.y = cellHeight/2 - label1Height/2;
cell.label1.frame = frame;
} else {
label1Frame.origin.y = cellHeight/2 - label1Height/2;
cell.label1.frame = label1Frame;
label2Frame.origin.y = cellHeight/2;
cell.label2.frame = label2Frame;
}
}
请 IOS 专家帮我提出建议。
最佳答案
最好将调整大小的计算移至 layoutSubviews。
//CustomCell.m
- (void)layoutSubviews{
CGRect label1Frame = self.label1.frame;
//Calculate the size of label 1
CGSize label1Size = [self.label1.text sizeWithFont:[self.label1 font]
constrainedToSize:CGSizeMake(label1Frame.size.width,42.0f)
lineBreakMode:NSLineBreakByTruncatingTail];
label1Frame.size.height = label1Size.height;
CGRect label2Frame = self.label2.frame;
//Calculate the size of label 2
CGSize label2Size = [self.label2.text sizeWithFont:[self.label2 font]
constrainedToSize:CGSizeMake(label2Frame.size.width,21.0f)
lineBreakMode:NSLineBreakByTruncatingTail];
label2Frame.size.height = label2Size.height;
//Total height of labels
CGFloat totalHeight = label1Frame.size.height+label2Frame.size.height+5.0f;
//For centering half of difference of two labels with cell
label1Frame.origin.y = (self.frame.size.height - totalHeight)/2.0f;
self.label1.frame = CGRectIntegral(label1Frame);
label2Frame.origin.y = label1Frame.origin.y+label1Frame.size.height+5.0f;
self.label2.frame = CGRectIntegral(label2Frame);
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
CustomCell1 *cell = (CustomCell1 *)[self.tableView dequeueReusableCellWithIdentifier:simpleTableIdentifier];
if (cell == nil)
{
NSArray *nib = [[NSBundle mainBundle] loadNibNamed:@"CustomCell1" owner:self options:nil];
cell = [nib objectAtIndex:0];
cell.label1.lineBreakMode = UILineBreakModeWordWrap;
cell.label1.numberOfLines = 2;
cell.label1.tag = [indexPath row];
}
cell.label1.text = [[responseArray objectAtIndex:[indexPath row]] text];
if([[[responseArray objectAtIndex:[indexPath row]] isDone] isEqualToString:@"N"]) {
cell.label2.text = @"";
} else {
cell.label2.text = @"Done";
}
return cell;
}
关于具有动态标签高度的 IOS Tableview 自定义单元格,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/16500560/