自定义单元格中的 UILabel 不会动态增加高度

Question

我有一个包含 3 个 UILabels 的自定义单元格。最后一个标签将包含嵌入 \n 的文本，以便该单元格中的数据每行列出一项。我知道所需的行数，并且每行需要 15 像素高。我必须更改此标签大小的代码如下：

//Set up the cell
static NSString *CellIdentifier = @"Cell";
CustomHistoryCell *cell = (CustomHistoryCell *)[tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
    cell = [[[CustomHistoryCell alloc] initWithFrame:CGRectZero reuseIdentifier:CellIdentifier] autorelease];
}
cell.probeInfo.lineBreakMode = UILineBreakModeWordWrap;
cell.probeInfo.numberOfLines = 0;
cell.probeInfo.text = theProbes;
[cell.probeInfo setAdjustsFontSizeToFitWidth:YES];
CGRect newFrame = cell.probeInfo.frame;
newFrame.size.height = nAdditionalLabelHeight*15;
cell.probeInfo.frame = newFrame;

theProbes 包含带有 \n 的文本，nAdditionalLabelHeight 包含行数。我已将背景颜色设置为灰色，以便我可以查看标签大小是否正确并且不会改变其高度。谁能看到我做错了什么吗？

以下是自定义单元 .h 文件的代码，以防可能有所帮助：

@interface CustomHistoryCell : UITableViewCell {
    UILabel *_stokerName;
    UILabel *_smokeDateTime;
    UILabel *_probeInfo;

}
@property (nonatomic,retain) UILabel *stokerName;
@property (nonatomic,retain) UILabel *smokeDateTime;
@property (nonatomic,retain) UILabel *probeInfo;

@end

以下是自定义单元 .m 文件的代码，以防可能有所帮助：

#import "CustomHistoryCell.h"


@implementation CustomHistoryCell

@synthesize stokerName = _stokerName;
@synthesize smokeDateTime = _smokeDateTime;
@synthesize probeInfo = _probeInfo;

- (id)initWithStyle:(UITableViewCellStyle)style
    reuseIdentifier:(NSString *)reuseIdentifier
{
    if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier])
    {
        // Initialization code
        self.stokerName = [[UILabel alloc]init];
        self.stokerName.textAlignment = UITextAlignmentLeft;
        self.stokerName.font = [UIFont boldSystemFontOfSize:20];
        self.smokeDateTime = [[UILabel alloc]init];
        self.smokeDateTime.textAlignment = UITextAlignmentLeft;
        self.smokeDateTime.font = [UIFont systemFontOfSize:12];
        self.probeInfo = [[UILabel alloc]init];
        self.probeInfo.textAlignment = UITextAlignmentLeft;
        self.probeInfo.font = [UIFont systemFontOfSize:12];
        self.probeInfo.backgroundColor = [UIColor grayColor];
        [self.contentView addSubview:self.stokerName];
        [self.contentView addSubview:self.smokeDateTime];
        [self.contentView addSubview:self.probeInfo];
    }


    return self;
}

- (void)layoutSubviews {
    [super layoutSubviews];
    CGRect contentRect = self.contentView.bounds;
    CGFloat boundsX = contentRect.origin.x;
    CGRect frame;
    frame= CGRectMake(boundsX+5,5, 300, 25);
    self.stokerName.frame = frame;
    frame= CGRectMake(boundsX+5,30, 300, 15);
    self.smokeDateTime.frame = frame;
    frame= CGRectMake(boundsX+5,45, 300, 15);
    self.probeInfo.frame = frame;
}

- (void)dealloc
{
    [super dealloc];
}

@end

Answer 1

我想出了一个办法来处理这个问题。我基本上重写了 initWithStyle 并传入了 nAdditionalLabelHeight 变量，然后用它来设置标签的高度。