带有包装标签的静态表格单元格的动态高度? [英] Dynamic height for static table cells with wrapping labels?

问题描述

我的文字在纵向模式下有两行长.当我切换到横向模式时，它适合一行.我正在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它?

My text is two lines long in portrait mode. When I switch to landscape mode, it fits into a single line. I'm using static tableview cells via a storyboard; how can I resize the row to fit snugly?

屏幕是登录屏幕.

• 第一个单元格包含一些说明文本
• 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(也是最后一个)单元格包含登录按钮.键盘上的返回键提交表单或适当切换焦点

推荐答案

使用 UITableView 的 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];
   }
 }

EDIT :为 > 的 support 添加和 <ios7 和 as sizeWithFont 方法在 iOS 7.0 中已弃用

EDIT : Added for support for > and < ios7 and as sizeWithFont method is deprecated in iOS 7.0

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