Question

问题：

我有一个UITableViewCell，当第一次出现时，该文字将文字换行，但是如果你再次旋转到横向并再回到肖像，文本就会被截断！为什么这样或如何解决？

额外明细：

我的手机是UITableViewCellStyleSubtitle风格。为了对文本进行自动换行（UITableViewCellStyleSubtitle的textLabel，而不是detailTextLabel），我计算文本的高度，并通过

设置。

 cell.textLabel.numberOfLines

我不能简单地将numberOfLines设置为0，当删除按钮滑入时，它看起来很丑。我之前的一个问题解释了这一点：Text stretches outside cell boundaries on delete slide

我通过heightForRowAtIndexPath设置标签的高度，但这可能不是问题，因为如果我将其硬编码到一个很大的高度，文本仍然会在方向旋转后截断。

修改

自写这篇文章以来，我注意到当我尝试重用单元格时，我的reuseIdentifier字符串不一样。解决这个问题已经改善了这种状况，有时现在细胞也很好。但是，有时它们仍然会在旋转时截断，而且，如果我再次向下滚动（因此重新加载单元格），它们可以截断或更改高度！

代码：

//This is a call back invoked by the interface when drawing the table view. This method will create a cell for each
//row and add text to each cell depending on the string retrieved from the datasource.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:@"SwitchCell"];
CGFloat textLabelFontSize = 19;

if (cell==nil){
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:@"cellType"] autorelease];
    // set the labels to the appropriate text for this row
    cell.textLabel.text = [(Group*)[composeData objectInChosenGroupsListAtIndex:indexPath.row]groupName];
    cell.textLabel.font = [UIFont systemFontOfSize:textLabelFontSize];

    if ([(Group*)[composeData objectInChosenGroupsListAtIndex:indexPath.row]isDynamic]){
         cell.detailTextLabel.text = NSLocalizedString(@"dynamic", @"dynamic");
    }
    else {
        //get and set the group size
        int groupSize = [(Group*)[composeData objectInChosenGroupsListAtIndex:indexPath.row]groupSize];

        if (groupSize == 1)
            cell.detailTextLabel.text = NSLocalizedString(@"1Contact", @"1 contact");
        else
            cell.detailTextLabel.text = [NSString stringWithFormat:NSLocalizedString(@"%dContacts", @"%d contacts"), groupSize];
    }
}

//Calculate height (so we can hard code the number of lines, which is neccesary to avoid ugly stretching when the delete button slides in)
CGFloat width = [[self table] frame].size.width-cell.indentationWidth-50;


int section = indexPath.section;

NSString *title_string = cell.textLabel.text;
NSString *detail_string = cell.detailTextLabel.text;

CGSize title_size = {0, 0};
CGSize detail_size = {0, 0};

if (title_string && [title_string isEqualToString:@""] == NO ) {
    title_size = [title_string sizeWithFont:[UIFont systemFontOfSize:textLabelFontSize]
                          constrainedToSize:CGSizeMake(width, 4000)
                              lineBreakMode:cell.textLabel.lineBreakMode];
}

if (detail_string && [title_string isEqualToString:@""] == NO ) {
    detail_size = [detail_string sizeWithFont:[UIFont systemFontOfSize:18.0]
                            constrainedToSize:CGSizeMake(width, 4000)
                                lineBreakMode:cell.detailTextLabel.lineBreakMode];
}

CGFloat title_height = title_size.height;
CGFloat detail_height = detail_size.height;

CGFloat content_size = title_height + detail_height;

CGFloat height;

switch ( section ) {

    case 0:
        height = content_size;
        break;

        //Just in case  
    default:
        height = 44.0;
        break;

}

//hard code numberOfLines, to avoid ugly stretching when delete slides in
cell.textLabel.numberOfLines = title_height/[UIFont systemFontOfSize:textLabelFontSize].lineHeight;
//set height for retrieval later if neccesary
cell.frame = CGRectMake(cell.frame.origin.x, cell.frame.origin.y, cell.frame.size.width, height);

return cell;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = (UITableViewCell *)[self tableView: tableView cellForRowAtIndexPath: indexPath];
return cell.frame.size.height;
}

Answer 1

这将有效：

-(void)viewWillAppear:(BOOL)animated
{
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(receivedRotate:) name:UIDeviceOrientationDidChangeNotification object:nil];
[[UIDevice currentDevice] beginGeneratingDeviceOrientationNotifications];

}

-(void)viewWillDisappear:(BOOL)animated
{
[[NSNotificationCenter defaultCenter] removeObserver:self name:UIDeviceOrientationDidChangeNotification object:nil];
}

现在实现以下方法：

-(void)checkOrientation
{
UIInterfaceOrientation orientation = self.interfaceOrientation;
if (orientation == UIDeviceOrientationLandscapeLeft||orientation==UIDeviceOrientationLandscapeRight)
{
    [tblView reloadData];  
    // Set numberOfLines = some value you think might adjust the text.
    // Set x coorinate of views if you want to change

}
else
{
    [tblView reloadData];
    // Set numberOfLines = some value you think might adjust the text.
    // Set x coordinates of views to initial x xoordinates.

}

}

创建 recievedRotate ：

- (void)receivedRotate:(NSNotification *)notification
{    
[self checkOrientation];
}

在 viewDidLoad ：

中

-(void)viewDidLoad
{  
[self checkOrientation];
}

Answer 2

此时，以下代码似乎可以在我的设备上运行，但不能在模拟器上运行。大多数测试都需要这样做。关键的解决方法是重用单元格，可能是[table reloadData]

// Override to allow orientations other than the default portrait orientation.
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation {
[table reloadData];
return [super shouldAutorotateToInterfaceOrientation:YES];
}

- (void)viewDidAppear:(BOOL)animated{
[table reloadData];
[super viewDidAppear:animated];
}

//This is a call back invoked by the interface when drawing the table view. This method will create a cell for each
//row and add text to each cell depending on the string retrieved from the datasource.
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

NSString * identifier = [NSString stringWithFormat:@"SwitchCell %d", indexPath.row]; // The cell row

UITableViewCell* cell = [tableView dequeueReusableCellWithIdentifier:identifier];
CGFloat textLabelFontSize = 19;

if (cell==nil){
    cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:identifier] autorelease];
    // set the labels to the appropriate text for this row
    cell.textLabel.text = [(Group*)[composeData objectInChosenGroupsListAtIndex:indexPath.row]groupName];
    cell.textLabel.font = [UIFont systemFontOfSize:textLabelFontSize];

    if ([(Group*)[composeData objectInChosenGroupsListAtIndex:indexPath.row]isDynamic]){
         cell.detailTextLabel.text = NSLocalizedString(@"dynamic", @"dynamic");
    }
    else {
        //get and set the group size
        int groupSize = [(Group*)[composeData objectInChosenGroupsListAtIndex:indexPath.row]groupSize];

        if (groupSize == 1)
            cell.detailTextLabel.text = NSLocalizedString(@"1Contact", @"1 contact");
        else
            cell.detailTextLabel.text = [NSString stringWithFormat:NSLocalizedString(@"%dContacts", @"%d contacts"), groupSize];
    }
}


CGFloat width = [[self table] frame].size.width-cell.indentationWidth-50;

int section = indexPath.section;

NSString *title_string = cell.textLabel.text;
NSString *detail_string = cell.detailTextLabel.text;

CGSize title_size = {0, 0};
CGSize detail_size = {0, 0};

if (title_string && [title_string isEqualToString:@""] == NO ) {
    title_size = [title_string sizeWithFont:[UIFont systemFontOfSize:textLabelFontSize]
                          constrainedToSize:CGSizeMake(width, 4000)
                              lineBreakMode:cell.textLabel.lineBreakMode];
}

if (detail_string && [title_string isEqualToString:@""] == NO ) {
    detail_size = [detail_string sizeWithFont:[UIFont systemFontOfSize:18.0]
                            constrainedToSize:CGSizeMake(width, 4000)
                                lineBreakMode:cell.detailTextLabel.lineBreakMode];
}

CGFloat title_height = title_size.height;
CGFloat detail_height = detail_size.height;

CGFloat content_size = title_height + detail_height;

CGFloat height;

switch ( section ) {

    case 0:
        height = content_size;
        break;

        //Just in case  
    default:
        height = 44.0;
        break;

}

//hard code numberOfLines, to avoid ugly stretching when delete slides in
cell.textLabel.numberOfLines = title_height/[UIFont systemFontOfSize:textLabelFontSize].lineHeight;
//set height for retrieval later if neccesary
cell.frame = CGRectMake(cell.frame.origin.x, cell.frame.origin.y, cell.frame.size.width, height);

return cell;
}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = (UITableViewCell *)[self tableView: tableView cellForRowAtIndexPath: indexPath];
return cell.frame.size.height;
}

单元格中的文本在旋转时截断！（编辑：单元格也会滚动）

2 个答案:

单元格中的文本在旋转时截断！ （编辑：单元格也会滚动）

2 个答案:

单元格中的文本在旋转时截断！（编辑：单元格也会滚动）