[英]How to set custom collectionView Cell Frame?
我想要第一个UICollectionViewCell
按屏幕的全宽显示,并且进一步的UICOllectionViewCell
是2 * 2。
为此,我尝试了下面的代码。
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 2
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if indexPath.item == 0 {
let cell : FirstCell = collectionView.dequeueReusableCell(withReuseIdentifier: "FirstCell", for: indexPath) as! FirstCell
cell.layoutSubviews()
return cell
}
else {
let cell : SecondCell = collectionView.dequeueReusableCell(withReuseIdentifier: "SecondCell", for: indexPath) as! SecondCell
cell.layoutSubviews()
return cell
}
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
if indexPath.item == 0 {
let width = (UIScreen.main.bounds.size.width - 16)
return CGSize(width: width, height: 200)
}
else {
let width = (UIScreen.main.bounds.size.width - 24) / 2
let height = (UIScreen.main.bounds.size.width * 200) / 320
return CGSize(width: width, height: height)
}
}
但是输出如下。
要求:第一个绿色单元格是全角,第二个黄色单元格不是来自中心,而是来自左侧,第三个,第四个单元格是2 * 2
任何帮助将不胜感激。
提前致谢。
为此,您应该在集合视图中使用3部分。
extension ViewController: UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 3
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return section == 2 ? 4 : 1
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
return UIEdgeInsets(top: 10, left: 10, bottom: 10, right: 10)
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
switch indexPath.section {
case 0:
return CGSize(width: UIScreen.main.bounds.width - 20, height: 200)
case 1:
return CGSize(width: (UIScreen.main.bounds.width - 30) / 2, height: 200)
default:
return CGSize(width: (UIScreen.main.bounds.width - 30) / 2, height: 200)
}
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "collectioncell", for: indexPath)
cell.backgroundColor = .red
return cell
}
}
您的视图如下所示:
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