我已经知道一些与此相关的问题,但是我以前尝试过这些问题,但仍然没有运气。
以下屏幕截图是我的问题 我当前的屏幕显示一个固定的单元格大小,并且在空白处显示了较大的空间,较大的内容通过点在该单元格上移动。
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if collectionView == self.catCollectionView{
let catCell = collectionView.dequeueReusableCell(withReuseIdentifier: "catCell", for: indexPath)
as! catCell
DispatchQueue.main.async {
catCell.configureCell()
let catCountInt = self.catCountArray[indexPath.row]
catCell.catCountLabel.text = String(catCountInt)
catCell.catNameLabel.text = self.categoryNameArray[indexPath.row]
catCell.catCountLabel.sizeToFit()
catCell.catNameLabel.sizeToFit()
}
return catCell
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let catCell = collectionView.dequeueReusableCell(withReuseIdentifier: "catCell", for: indexPath)
as! catCell
catCell.catNameLabel.text = self.categoryNameArray[indexPath.item]
catCell.catNameLabel.sizeToFit()
let labelWidth = catCell.catNameLabel.frame.width + 10
print("frame width: \(labelWidth)")
return CGSize(width: labelWidth, height: 21)
}
}
也许我在这里错过了一件简单的事情,但是我现在还不太清楚。请帮助我,抱歉我的英语很奇怪。
答案 0 :(得分:2)
让我们假设您正在使用一个简单的UICollectionViewCell
子类,该子类在情节提要中正确设置了约束(标签固定在其视图的所有四个侧面),如下所示:
class CategoryCell: UICollectionViewCell {
@IBOutlet var nameLabel: UILabel!
override func awakeFromNib() {
super.awakeFromNib()
layer.borderWidth = 1
}
}
然后,您只需让自动布局即可确定单元格的大小:
class CollectionViewController: UICollectionViewController {
let categories = [
"All Products",
"Fresh",
"Health & Beauty",
"Beverages",
"Home & life"
]
private var flowLayout: UICollectionViewFlowLayout? {
return collectionViewLayout as? UICollectionViewFlowLayout
}
override func viewDidLoad() {
super.viewDidLoad()
collectionView.backgroundColor = .white
flowLayout?.sectionInset = .init(top: 15, left: 15, bottom: 15, right: 15)
flowLayout?.sectionInsetReference = .fromSafeArea
flowLayout?.estimatedItemSize = UICollectionViewFlowLayout.automaticSize
DispatchQueue.main.async {
self.flowLayout?.invalidateLayout()
}
}
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return categories.count
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CategoryCell", for: indexPath) as! CategoryCell
cell.nameLabel.text = categories[indexPath.row]
return cell
}
}
结果:
答案 1 :(得分:1)
您可以使用{{1}上的dequeuing
来简单计算{{1}的cell
,而无需collectionView(_:layout:sizeForItemAt:)
中的另外width
}},即
categoryName
在size(withAttributes:)
中,提供您希望categoryName
成为的func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let text = self.categoryNameArray[indexPath.row] {
let cellWidth = text.size(withAttributes:[.font: UIFont.systemFont(ofSize:14.0)]).width + 10.0
return CGSize(width: cellWidth, height: 21.0)
}
。