Question

我有一个列表视图，有时会有长文本。当文本是几段时，它往往会在某些时候被切断。部分奇怪的行为是，它并不总是被同一个角色切断，而是随机的。

以下是我用来填充列表的代码：

// CREATING EACH CELL IN THE LIST
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{    
    //static const NSInteger kLabelTag = 1;
    UITableViewCell *cell = [[UITableViewCell alloc] initWithStyle:(UITableViewCellStyleDefault)
            reuseIdentifier:@"business"];

    NSString *comment = [[items_array objectAtIndex:[indexPath row]] objectForKey:(@"comment")];
    NSString *first_name = [[items_array objectAtIndex:[indexPath row]] objectForKey:(@"first_name")];
    //Boolean *is_private = [[items_array objectAtIndex:[indexPath row]] objectForKey:(@"is_private")];

    // Creating a constraint size for the label you are making
    CGSize constraint = CGSizeMake(320 - (10 * 2), 20000.0f); 

    // Determining the size that you will need for the label based on the comment
    // length and the contraint size
    CGSize size = [comment sizeWithFont:[UIFont systemFontOfSize:14] constrainedToSize:constraint lineBreakMode:UILineBreakModeWordWrap]; 

    //  Creating the label and initializing it with the frame that you have
    //  determined by your size calculations above
    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 320, MAX(size.height, 44.0f) + 20.0f)];

    // setting up the label properties
    label.numberOfLines = 0;
    label.lineBreakMode = UILineBreakModeWordWrap;

    standardUserDefaults = [NSUserDefaults standardUserDefaults];
    NSString *is_private = [standardUserDefaults objectForKey:@"is_private"];

    if ( is_private == nil )
    {
        label.text = [first_name stringByAppendingString:[@": "  stringByAppendingString:comment]]; // comment;
    }
    else
    if ( [is_private isEqualToString:@"0"])
    {
        label.text = [first_name stringByAppendingString:[@": "  stringByAppendingString:comment]]; // comment;     
    }
    else 
    {
        label.text = comment;  
    }

    // adding the label view to the cell that you have created
    [cell.contentView addSubview:label];        

    // CLOSE THE SPINNER
    [spinner stopAnimating];

    // return the cell for the table view
    return cell;
}

//This method will determine how tall each row needs to be. Cell size for word wrapping.
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath;
{    
    NSString *comment = [[items_array objectAtIndex:[indexPath row]] objectForKey:(@"comment")];

    // Again you are getting the constraints because you are going to us this size
    // to constrain the height of the cell just like you determined the size for the label.
    CGSize constraint = CGSizeMake(320 - (10 * 2), 20000.0f);

    // Again, determining the size that we will need for the label, because it will drive
    // the height of the cell
    CGSize size = [comment sizeWithFont:[UIFont systemFontOfSize:14] constrainedToSize:constraint lineBreakMode:UILineBreakModeWordWrap]; 

    //  Finally, we can determine the height for the cell!
    CGFloat height = MAX(size.height, 44.0f);

    //  return the height, which is the height of the label plus some extra space to make
    //  it look good.
    return height + (10 * 2);
}

此代码是否有任何特别不正确的代码？或者问题是否可能根植于其他地方？

谢谢！

Answer 1

创建标签时，请将其交给最大高度

MAX(size.height, 44.0f)

这意味着标签永远不会高于44分。如果文本（被包装以适合标签的宽度）高于标签，则在其下方休闲的行仍将在标签中，但不可见。

您的选择：

- 使标签字体自动调整大小

- 更改高度，或切换到标签的动态高度

每次更新时都会出现这样的情况：

myLabel.text = @"some text";
CGRect rect = myLabel.frame;
rect.size.height = textView.contentSize.height;// Adding.size Since height is not a member of CGRect
textView.frame = rect; //your label is now as high as its contents (the text)

- 修改进入标签的文本，使其永远不会超过标签的高度。

Answer 2

除非绝对必要，否则我将摆脱拥有自己的UILabel，并根据字符串大小动态调整单元格的高度。看看下面的例子：

在加载tableview之前创建字符串

-(void)createStrings{

    newArray = [NSMutableArray array];

    for(NSDictionary *dictionary in items_array){
        NSString *comment = [dictionary objectForKey:(@"comment")];
        NSString *first_name = [dictionary objectForKey:(@"first_name")];
        NSString *combinedString = [first_name  stringByAppendingString:[@": "  stringByAppendingString:comment]];
        [newArray addObject:combinedString];
    }

}

#pragma mark - Table View Data Source
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = nil;

    static NSString *CellIdentifier = @"Cell";
    cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
    // Configure the cell...
    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
        cell.textLabel.lineBreakMode = UILineBreakModeWordWrap;
        cell.textLabel.numberOfLines = 0;
        cell.textLabel.font = [UIFont fontWithName:@"Helvetica" size:17];
    }

    cell.textLabel.text = [newArray objectAtIndex:indexPath.row];

    return cell;
}

#pragma mark - Table View Delegate
-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath{
        UIFont *cellFont = [UIFont fontWithName:@"Helvetica" size:17];
        CGSize constraintSize = CGSizeMake(self.tableView.frame.size.width, MAXFLOAT);
        CGSize labelSize = [[newArray objectAtIndex:indexPath.row] sizeWithFont:cellFont constrainedToSize:constraintSize lineBreakMode:UILineBreakModeWordWrap];

        return labelSize.height + 30;
}

ios - 列表项目在一定长度后文本被截断

2 个答案: