具有包装标签的静态表格单元的动态高度？

Question

我的文字在纵向模式下是两行.当我切换到横向模式时,它适合单行.我通过故事板使用静态tableview单元格; 我怎样才能调整行的大小以适应？

屏幕是一个登录屏幕.

• 第一个单元格包含一些解释文本
• 第二个是用于输入帐户名称的文本字段
• 第三个是用于输入密码的安全文本字段
• 第四个(和最后一个)单元格包含登录按钮.键盘上的返回键会提交表单或根据需要切换焦点

Answer 1

用途UITableView's heightForRowAtIndexPath:

 - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
 {
   int topPadding = 10;
   int bottomPadding = 10;
   float landscapeWidth = 400;
   float portraitWidth = 300;

   UIFont *font = [UIFont fontWithName:@"Arial" size:22];

   //This is for first cell only if you want for all then remove below condition
   if (indexPath.row == 0) // for cell with dynamic height
   {
      NSString *strText = [[arrTexts objectAtIndex:indexPath.row]; // filling text in label  
     if(landscape)//depends on orientation
     {
       CGSize maximumSize = CGSizeMake(landscapeWidth, MAXFLOAT); // change width and height to your requirement
     }
     else //protrait
     {
       CGSize maximumSize = CGSizeMake(portraitWidth, MAXFLOAT); // change width and height to your requirement
     }

     //dynamic height of string depending on given width to fit
     CGSize textSize = CGSizeZero;
     if(SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"7.0")
     {
        NSMutableParagraphStyle *pstyle = [NSMutableParagraphStyle new];
        pstyle.lineBreakMode = NSLineBreakByWordWrapping;

        textSize = [[strText boundingRectWithSize:CGSizeMake(width, MAXFLOAT) options:NSStringDrawingUsesLineFragmentOrigin attributes:@{NSFontAttributeName :font,NSParagraphStyleAttributeName:[pstyle copy]} context:nil] size];
     }
     else // < (iOS 7.0)
     {
        textSize = [strText sizeWithFont:font constrainedToSize:maximumSize lineBreakMode:NSLineBreakByWordWrapping] 
     }

     return (topPadding+textSize.height+bottomPadding) // caculate on your bases as u have string height
   }
   else
   {
       // return height from the storyboard
       return [super tableView:tableView heightForRowAtIndexPath:indexPath];
   }
 }

编辑:已添加for supportfor > and < ios7和as sizeWithFont方法在iOS 7.0中已弃用

Answer 2

我已经成功实现了一点点简单.只要静态表视图对单元格有适当的约束,您就可以要求系统为您调整大小:

override func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat
{
    let cell = self.tableView(self.tableView, cellForRowAtIndexPath: indexPath)
    let height = ceil(cell.systemLayoutSizeFittingSize(CGSizeMake(self.tableView.bounds.size.width, 1), withHorizontalFittingPriority: 1000, verticalFittingPriority: 1).height)
    return height
}