设置自定义UITableViewCells高度-Java 学习之路

216

我正在使用自定义UITableViewCell，它有一些标签，按钮和图像视图可供显示 . 单元格中有一个标签，其文本为 NSString 对象，字符串的长度可以是可变的 . 因此，我无法在 UITableView 的 heightForCellAtIndex 方法中为单元格设置恒定高度 . 单元格's height depends on the label'的高度可以使用 NSString 的 sizeWithFont 方法确定 . 我试过用它，但看起来我在某个地方出错了 . 怎么修好？

这是用于初始化单元格的代码 .

if (self = [super initWithFrame:frame reuseIdentifier:reuseIdentifier])
{
    self.selectionStyle = UITableViewCellSelectionStyleNone;
    UIImage *image = [UIImage imageNamed:@"dot.png"];
    imageView = [[UIImageView alloc] initWithImage:image];
    imageView.frame = CGRectMake(45.0,10.0,10,10);

    headingTxt = [[UILabel alloc] initWithFrame:   CGRectMake(60.0,0.0,150.0,post_hdg_ht)];
    [headingTxt setContentMode: UIViewContentModeCenter];
    headingTxt.text = postData.user_f_name;
    headingTxt.font = [UIFont boldSystemFontOfSize:13];
    headingTxt.textAlignment = UITextAlignmentLeft;
    headingTxt.textColor = [UIColor blackColor];

    dateTxt = [[UILabel alloc] initWithFrame:CGRectMake(55.0,23.0,150.0,post_date_ht)];
    dateTxt.text = postData.created_dtm;
    dateTxt.font = [UIFont italicSystemFontOfSize:11];
    dateTxt.textAlignment = UITextAlignmentLeft;
    dateTxt.textColor = [UIColor grayColor];

    NSString * text1 = postData.post_body;
    NSLog(@"text length = %d",[text1 length]);
    CGRect bounds = [UIScreen mainScreen].bounds;
    CGFloat tableViewWidth;
    CGFloat width = 0;
    tableViewWidth = bounds.size.width/2;
    width = tableViewWidth - 40; //fudge factor
    //CGSize textSize = {width, 20000.0f}; //width and height of text area
    CGSize textSize = {245.0, 20000.0f}; //width and height of text area
    CGSize size1 = [text1 sizeWithFont:[UIFont systemFontOfSize:11.0f]
                        constrainedToSize:textSize lineBreakMode:UILineBreakModeWordWrap];

    CGFloat ht = MAX(size1.height, 28);
    textView = [[UILabel alloc] initWithFrame:CGRectMake(55.0,42.0,245.0,ht)];
    textView.text = postData.post_body;
    textView.font = [UIFont systemFontOfSize:11];
    textView.textAlignment = UITextAlignmentLeft;
    textView.textColor = [UIColor blackColor];
    textView.lineBreakMode = UILineBreakModeWordWrap;
    textView.numberOfLines = 3;
    textView.autoresizesSubviews = YES;

    [self.contentView addSubview:imageView];
    [self.contentView addSubview:textView];
    [self.contentView addSubview:webView];
    [self.contentView addSubview:dateTxt];
    [self.contentView addSubview:headingTxt];
    [self.contentView sizeToFit];

    [imageView release];
    [textView release];
    [webView release];
    [dateTxt release];
    [headingTxt release];
}

这是高度和宽度出错的标签：

textView = [[UILabel alloc] initWithFrame:CGRectMake(55.0,42.0,245.0,ht)];

9 回答

127

要设置行高和估计行高的自动尺寸，请确保执行以下步骤，自动尺寸对单元格/行高度布局有效 .

分配并实现tableview dataSource和delegate
将 UITableViewAutomaticDimension 分配给rowHeight＆estimatedRowHeight
实现委托/ dataSource方法（即 heightForRowAt 并返回值 UITableViewAutomaticDimension ）

Objective C:

// in ViewController.h
#import <UIKit/UIKit.h>

@interface ViewController : UIViewController <UITableViewDelegate, UITableViewDataSource>

  @property IBOutlet UITableView * table;

@end

// in ViewController.m

- (void)viewDidLoad {
    [super viewDidLoad];
    self.table.dataSource = self;
    self.table.delegate = self;

    self.table.rowHeight = UITableViewAutomaticDimension;
    self.table.estimatedRowHeight = UITableViewAutomaticDimension;
}

-(CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {

    return UITableViewAutomaticDimension;
}

Swift:

@IBOutlet weak var table: UITableView!

override func viewDidLoad() {
    super.viewDidLoad()

    // Don't forget to set dataSource and delegate for table
    table.dataSource = self
    table.delegate = self

    // Set automatic dimensions for row height
    table.rowHeight = UITableViewAutomaticDimension
    table.estimatedRowHeight = UITableViewAutomaticDimension
}



// UITableViewAutomaticDimension calculates height of label contents/text
func tableView(_ tableView: UITableView, heightForRowAt indexPath: IndexPath) -> CGFloat {
    return UITableViewAutomaticDimension
}

对于UITableviewCell中的标签实例

设置行数= 0（＆换行模式=截断尾部）
相对于其superview / cell容器设置所有约束（顶部，底部，右侧） .
可选：如果您希望标签覆盖最小垂直区域，即使没有数据，也要设置标签的最小高度 .

enter image description here

Note ：如果您希望以更高优先级展开/压缩的标签，则为“内容拥抱和压缩阻力优先级” .

在这个例子中，我设置了低拥抱和高压缩阻力优先级，这导致为第二（黄色）标签的内容设置更多优先级/重要性 .

enter image description here

回复于 2024-05-03T19:01:37+08:00

23

如果所有行都是相同的高度，只需设置UITableView的 rowHeight 属性，而不是实现 heightForRowAtIndexPath . Apple Docs：

使用tableView：heightForRowAtIndexPath：而不是rowHeight会对性能产生影响 . 每次显示表视图时，它都会在其每个行的委托上调用tableView：heightForRowAtIndexPath：这会导致具有大量行（大约1000或更多）的表视图出现严重的性能问题 .

回复于 2024-05-03T19:01:37+08:00
3
你的 UITableViewDelegate 应该实现 tableView:heightForRowAtIndexPath:
```
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return [indexPath row] * 20;
}
```
您可能希望使用 NSString 的 sizeWithFont:constrainedToSize:lineBreakMode: 方法来计算行高，而不是仅仅对indexPath执行一些愚蠢的数学运算:)
回复于 2024-05-03T19:01:37+08:00

490

要使动态单元格高度随着Label文本的增加而增加，首先需要计算高度，即文本将在 -heightForRowAtIndexPath 委托方法中使用并返回其他标签的附加高度，图像（其他静态文本高度的最大高度）组件）并在单元格创建中使用相同的高度 .

#define FONT_SIZE 14.0f
#define CELL_CONTENT_WIDTH 300.0f  
#define CELL_CONTENT_MARGIN 10.0f

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath;
{

    if (indexPath.row == 2) {  // the cell you want to be dynamic

        NSString *text = dynamic text for your label;

        CGSize constraint = CGSizeMake(CELL_CONTENT_WIDTH - (CELL_CONTENT_MARGIN * 2), 20000.0f);
        CGSize size = [text sizeWithFont:[UIFont systemFontOfSize:FONT_SIZE] constrainedToSize:constraint lineBreakMode:UILineBreakModeWordWrap];

        CGFloat height = MAX(size.height, 44.0f);

        return height + (CELL_CONTENT_MARGIN * 2);
    }
    else {
        return 44; // return normal cell height
    }
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {

    static NSString *CellIdentifier = @"Cell";

    UILabel *label;

    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

    if (cell == nil) {
        cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleValue1 reuseIdentifier:CellIdentifier] ;
    }

    label = [[UILabel alloc] initWithFrame:CGRectMake(10, 5, 280, 34)];

    [label setNumberOfLines:2];

    label.backgroundColor = [UIColor clearColor];

    [label setFont:[UIFont systemFontOfSize:FONT_SIZE]];

    label.adjustsFontSizeToFitWidth = NO;

    [[cell contentView] addSubview:label];


    NSString *text = dynamic text fro your label;

    [label setText:text];

    if (indexPath.row == 2) {// the cell which needs to be dynamic 

        [label setNumberOfLines:0];

        CGSize constraint = CGSizeMake(CELL_CONTENT_WIDTH - (CELL_CONTENT_MARGIN * 2), 20000.0f);

        CGSize size = [text sizeWithFont:[UIFont systemFontOfSize:FONT_SIZE] constrainedToSize:constraint lineBreakMode:UILineBreakModeWordWrap];

        [label setFrame:CGRectMake(CELL_CONTENT_MARGIN, CELL_CONTENT_MARGIN, CELL_CONTENT_WIDTH - (CELL_CONTENT_MARGIN * 2), MAX(size.height, 44.0f))];

    }
    return  cell;
}

回复于 2024-05-03T19:01:37+08:00

#define FONT_SIZE 14.0f
#define CELL_CONTENT_WIDTH 300.0f
#define CELL_CONTENT_MARGIN 10.0f

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath      *)indexPath;
{
   /// Here you can set also height according to your section and row
   if(indexPath.section==0 && indexPath.row==0)
   {
     text=@"pass here your dynamic data";

     CGSize constraint = CGSizeMake(CELL_CONTENT_WIDTH - (CELL_CONTENT_MARGIN * 2), 20000.0f);

     CGSize size = [text sizeWithFont:[UIFont systemFontOfSize:FONT_SIZE]      constrainedToSize:constraint lineBreakMode:UILineBreakModeWordWrap];

     CGFloat height = MAX(size.height, 44.0f);

     return height + (CELL_CONTENT_MARGIN * 2);
   }
   else
   {
      return 44;
   }
}

- (UITableViewCell *)tableView:(UITableView *)tv cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell;
    UILabel *label = nil;

    cell = [tv dequeueReusableCellWithIdentifier:@"Cell"];
    if (cell == nil)
    {
       cell = [[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:@"Cell"];
    }
    ********Here you can set also height according to your section and row*********
    if(indexPath.section==0 && indexPath.row==0)
    {
        label = [[UILabel alloc] initWithFrame:CGRectZero];
        [label setLineBreakMode:UILineBreakModeWordWrap];
        [label setMinimumFontSize:FONT_SIZE];
        [label setNumberOfLines:0];
        label.backgroundColor=[UIColor clearColor];
        [label setFont:[UIFont systemFontOfSize:FONT_SIZE]];
        [label setTag:1];

        // NSString *text1 =[NSString stringWithFormat:@"%@",text];

        CGSize constraint = CGSizeMake(CELL_CONTENT_WIDTH - (CELL_CONTENT_MARGIN * 2), 20000.0f);

        CGSize size = [text sizeWithFont:[UIFont systemFontOfSize:FONT_SIZE] constrainedToSize:constraint lineBreakMode:UILineBreakModeWordWrap];

        if (!label)
        label = (UILabel*)[cell viewWithTag:1];


        label.text=[NSString stringWithFormat:@"%@",text];
        [label setFrame:CGRectMake(CELL_CONTENT_MARGIN, CELL_CONTENT_MARGIN, CELL_CONTENT_WIDTH          - (CELL_CONTENT_MARGIN * 2), MAX(size.height, 44.0f))];
        [cell.contentView addSubview:label];
    }
return cell;
}

回复于 2024-05-03T19:01:37+08:00

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath;
{
    CGSize constraintSize = {245.0, 20000}
    CGSize neededSize = [ yourText sizeWithFont:[UIfont systemFontOfSize:14.0f] constrainedToSize:constraintSize  lineBreakMode:UILineBreakModeCharacterWrap]
if ( neededSize.height <= 18) 

   return 45
else return neededSize.height + 45 
//18 is the size of your text with the requested font (systemFontOfSize 14). if you change fonts you have a different number to use  
// 45 is what is required to have a nice cell as the neededSize.height is the "text"'s height only
//not the cell.

}

回复于 2024-05-03T19:01:37+08:00

在自定义UITableViewCell控制器中添加此项

-(void)layoutSubviews {  

    CGRect newCellSubViewsFrame = CGRectMake(0, 0, self.frame.size.width, self.frame.size.height);
    CGRect newCellViewFrame = CGRectMake(self.frame.origin.x, self.frame.origin.y, self.frame.size.width, self.frame.size.height);

    self.contentView.frame = self.contentView.bounds = self.backgroundView.frame = self.accessoryView.frame = newCellSubViewsFrame;
    self.frame = newCellViewFrame;

    [super layoutSubviews];
}

在UITableView -controller中添加此项

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    return [indexPath row] * 1.5; // your dynamic height...
}

回复于 2024-05-03T19:01:37+08:00

感谢关于此主题的所有帖子，有一些非常有用的方法来调整UITableViewCell的rowHeight .

以下是其他人的一些概念的汇编，这些概念在构建iPhone和iPad时非常有用 . 您还可以访问不同的部分，并根据不同的视图大小进行调整 .

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {

if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad)
{
    int cellHeight = 0;

    if ([indexPath section] == 0) 
    {
        cellHeight = 16;
        settingsTable.rowHeight = cellHeight;
    }
    else if ([indexPath section] == 1)
    {
        cellHeight = 20;
        settingsTable.rowHeight = cellHeight;
    }

    return cellHeight;
}
else
{
    int cellHeight = 0;

    if ([indexPath section] == 0) 
    {
        cellHeight = 24;
        settingsTable.rowHeight = cellHeight;
    }
    else if ([indexPath section] == 1)
    {
        cellHeight = 40;
        settingsTable.rowHeight = cellHeight;
    }

    return cellHeight;
}
return 0;
}

回复于 2024-05-03T19:01:37+08:00

8
我看到了很多解决方案，但都是错误的或不完整的 . 您可以在viewDidLoad和autolayout中解决5行的所有问题 . 这对于客观的C：
```
_tableView.delegate = self;
_tableView.dataSource = self;
self.tableView.estimatedRowHeight = 80;//the estimatedRowHeight but if is more this autoincremented with autolayout
self.tableView.rowHeight = UITableViewAutomaticDimension;
[self.tableView setNeedsLayout];
[self.tableView layoutIfNeeded];
self.tableView.contentInset = UIEdgeInsetsMake(20, 0, 0, 0) ;
```
对于swift 2.0：
```
self.tableView.estimatedRowHeight = 80
 self.tableView.rowHeight = UITableViewAutomaticDimension      
 self.tableView.setNeedsLayout()
 self.tableView.layoutIfNeeded()
 self.tableView.contentInset = UIEdgeInsetsMake(20, 0, 0, 0)
```
现在使用xib创建您的单元格或在Storyboard中创建tableview使用此功能，您无需再执行任何操作或覆盖 . （不要忘记数字os行0）和底部标签（约束）降级“内容拥抱优先级 - 垂直到250”

您可以在下一个网址中下载代码：https://github.com/jposes22/exampleTableCellCustomHeight

参考文献：http://candycode.io/automatically-resizing-uitableviewcells-with-dynamic-text-height-using-auto-layout/
回复于 2024-05-03T19:01:37+08:00

设置自定义UITableViewCells高度

9 回答

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