自动集合视图单元格高度

Question

我有一个带标签的自定义单元格。我从服务器获取文本，集合中的单元格必须选择高度，以便所有文本适合且可见。现在我用这个方法，但我不知道如何改变高度来调整。

 func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
       
        return   CGSize(width: self.bounds.width, height: 90)
      
   }

Answer 1

第 1 步：- 创建一个函数来估计文本的大小：此方法将 return 一个适合您的字符串的高度值！

private func estimateFrameForText(text: String) -> CGRect {
    //we make the height arbitrarily large so we don't undershoot height in calculation
    let height: CGFloat = 999

    let size = CGSize(width: yourDesiredWidth, height: height)
    let options = NSStringDrawingOptions.UsesFontLeading.union(.UsesLineFragmentOrigin)
    let attributes = [NSFontAttributeName: UIFont.systemFontOfSize(18, weight: UIFontWeightLight)]

    return NSString(string: text).boundingRectWithSize(size, options: options, attributes: attributes, context: nil)
}

第 2 步：使用或覆盖下面的委托方法：

func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
    var height: CGFloat = 0

   //we are just measuring height so we add padding constant to give the label some room to breathe! 
    var padding: CGFloat = 10

let stringFromViewModel = “Hello please pass your string here from array…”
    //estimate each cell's height
         height = estimateFrameForText(stringFromViewModel).height + padding
    return CGSize(width: yourDesiredWidth, height: height)
}

自动集合视图单元格高度

Auto collection view cell Height

cell

sift

ios

uicollectionview