ios - Swift 给 uicollectionviewcell 宽度和动态高度
<p><p>我有这个 uicollectionviewcell</p>
<pre><code>func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = commentSection.dequeueReusableCell(withReuseIdentifier: cellId, for: indexPath) as! CommentCell
return cell
}
</code></pre>
<p><code>CommentCell</code>:</p>
<pre><code>let CommenterprofileImage: UIImageView = {
let v = UIImageView()
v.translatesAutoresizingMaskIntoConstraints = false
return v
}()
let commentText: UILabel = {
let l = UILabel()
l.numberOfLines = 0
l.text = "some text"
l.translatesAutoresizingMaskIntoConstraints = false
return l
}()
override init(frame: CGRect) {
super.init(frame: frame)
backgroundColor = .blue
designCell()
}
func designCell(){
addSubview(CommenterprofileImage)
addSubview(commentText)
addCellConstraints()
}
func addCellConstraints(){
CommenterprofileImage.topAnchor.constraint(equalTo: self.topAnchor,constant:10).isActive = true
CommenterprofileImage.leftAnchor.constraint(equalTo: self.leftAnchor,constant:20).isActive = true
CommenterprofileImage.widthAnchor.constraint(equalToConstant: 70).isActive = true
CommenterprofileImage.heightAnchor.constraint(equalToConstant: 70).isActive = true
commentText.topAnchor.constraint(equalTo: CommenterprofileImage.bottomAnchor,constant:20).isActive = true
commentText.leftAnchor.constraint(equalTo: self.leftAnchor).isActive = true
commentText.rightAnchor.constraint(equalTo: self.rightAnchor).isActive = true
}
</code></pre>
<p>我希望这个单元格的宽度等于 <code>view</code> 的宽度，但我希望它的高度取决于它的内容。
我试过这样做</p>
<pre><code>layout.estimatedItemSize = CGSize(width: view.frame.width, height: 100)
</code></pre>
<p>但是我的单元格的高度是 100，宽度小于 100。</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>你可以这样做-:</p>
<p>先用<code>boundingRect</code>方法计算标签高度-:</p>
<pre><code>func estimatedFrameHeight(text:String) -> CGRect{
let size = CGSize(width: (view.frame.width/2 - 8), height: 1000)
let options = NSStringDrawingOptions.usesFontLeading.union(.usesLineFragmentOrigin)
let attribute =
return NSString(string: text).boundingRect(with: size, options: options, attributes: attribute, context: nil)
}
</code></pre>
<p>保留您提供给标签的完全相同的字体，并保留 <code>.usesLineFragmentOrigin</code> 用于多行标签。</p>
<p>现在在 CollectionView <code>sizeForItemAt indexPath</code> 中执行此操作-:</p>
<pre><code>func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let width = (collectionView.frame.width)
let subDict = subCategoryListArray
if let product_name = subDict["product_name"] as? String {
let height = estimatedFrameHeight(text:product_name)
return CGSize(width: width, height: height.height + 70 + 10 + 20)
}
return CGSize(width: 0, height: 0)
}
</code></pre>
<p><code>让高度 =estimatedFrameHeight(text:product_name)</code> 。如果需要，这将为您提供估计的高度和宽度。现在您已经计算出标签高度，您需要添加 imageView 高度、y 位置约束以使其工作。您可以从这里获取它-:</p>
<pre><code>CommenterprofileImage.heightAnchor.constraint(equalToConstant: 70).isActive = true
Height = 70 you have.
</code></pre>
<p>还有，</p>
<pre><code>CommenterprofileImage.topAnchor.constraint(equalTo: self.topAnchor,constant:10).isActive = true
commentText.topAnchor.constraint(equalTo: CommenterprofileImage.bottomAnchor,constant:20).isActive
</code></pre>
<p>顶部约束 = <code>10</code></p>
<p>顶部约束 = <code>20</code></p>
<p>所以你现在需要添加这个，正如你在回答中看到的那样。</p>
<p><strong>备注-:</strong></p>
<blockquote>
<p>only add ImageView Height if it is above label else not require,just
add height and y padding for what ever you have above label.</p>
<p>Same to calculate exact width for label subtarct leading or trailing
space.</p>
</blockquote>
<p><strong>如果标签覆盖整个宽度(不需要插入减法)-:</strong></p>
<pre><code>func estimatedFrameHeight(text:String) -> CGRect{
let size = CGSize(width: (view.frame.width), height: 1000)
let options = NSStringDrawingOptions.usesFontLeading.union(.usesLineFragmentOrigin)
let attribute =
return NSString(string: text).boundingRect(with: size, options: options, attributes: attribute, context: nil)
}
</code></pre>
<p><strong>如果标签距离领先 20 点，则减去 -:</strong></p>
<pre><code>func estimatedFrameHeight(text:String) -> CGRect{
let size = CGSize(width: (view.frame.width - 20), height: 1000)
let options = NSStringDrawingOptions.usesFontLeading.union(.usesLineFragmentOrigin)
let attribute =
return NSString(string: text).boundingRect(with: size, options: options, attributes: attribute, context: nil)
}
</code></pre></p>
<p style="font-size: 20px;">关于ios - Swift 给 uicollectionviewcell 宽度和动态高度，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/45663870/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/45663870/
</a>
</p>
页:
[1]