文章掘金地址：https://juejin.cn/post/7070728070151274532 文章简书地址：https://www.jianshu.com/p/41600e45a10a
基本效果图
实现方法
UICollectionView 重新自定义 UICollectionViewLayout
demo 地址 https://gitee.com/Sunny0123/lztag(不更新，最新到github) 最新代码地址：https://github.com/lizhi0123/LZTag
v1.0.1 支持 swift5 v1.0.0 支持 swift 4.2
更新pod命令
pod repo update
podfile 文件里添加
pod 'LZTag'
命令安装
pod install
| 方法/属性 | 说明 |
|---|---|
| func tagLayout(_ layout: LZTagLayout, collectionView: UICollectionView, textForItemAt indexPath: IndexPath) -> String | delegate 方法 文字内容for cell ；textForItemAt + itemFont + tagInnerMarginForItemAt 共同控制cell的宽度 |
| func tagLayout(_ layout: LZTagLayout, collectionView: UICollectionView, sizeForSupplementaryElementOfKind kind: String, at section: Int) -> CGSize | section head footer size |
| func tagLayout(_ layout: LZTagLayout, collectionView: UICollectionView, tagInnerMarginForItemAt indexPath: IndexPath) -> CGFloat | 标签的内边距; textForItemAt + itemFont + tagInnerMarginForItemAt 共同控制cell的宽度 |
| itemSpacing | 元素间距 |
| lineSpacing | 行间距 |
| itemHeight | 标签的高度 |
| itemFont | 标签的字体 ; textForItemAt + itemFont + tagInnerMarginForItemAt 共同控制cell的宽度 |
| delegate | 代理 |
| ✅contentAlignment | 对其方式：靠左，靠右，居中 |
1.设置collection的layout 为 LZTagLayout
lazy var layout: LZTagLayout = {
let lay = LZTagLayout()
lay.itemSpacing = 10
lay.lineSpacing = 10
lay.itemHeight = 25
lay.itemFont = UIFont.systemFont(ofSize: 12)
lay.itemSpacing = 10
lay.contentAlignment = .left
lay.delegate = self
return lay
}()
private(set) lazy var collectionView: UICollectionView = {
let layout = self.layout
let temp = UICollectionView(frame: .zero, collectionViewLayout: layout)
return temp
}()
2.正常使用collectionview
collectionView.register(RoundCollectionCell.self, forCellWithReuseIdentifier: "RoundCollectionCell")
collectionView.register(CollectionHeadView.self, forSupplementaryViewOfKind:UICollectionElementKindSectionHeader , withReuseIdentifier: "CollectionHeadView")
collectionView.register(UICollectionReusableView.self, forSupplementaryViewOfKind:UICollectionElementKindSectionFooter , withReuseIdentifier: "UICollectionReusableView")
collectionView.dataSource = self
collectionView.backgroundColor = .yellow
self.view.addSubview(collectionView)
3.实现UICollectionViewDataSource，cell可根据需求自定义
extension RoundViewController: UICollectionViewDataSource {
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 2
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return self.titles.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "RoundCollectionCell", for: indexPath) as! RoundCollectionCell
let title = self.titles[indexPath.row]
cell.fill(title: title)
return cell
}
func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
switch kind {
case UICollectionElementKindSectionHeader:
let headView = collectionView.dequeueReusableSupplementaryView(ofKind: UICollectionElementKindSectionHeader, withReuseIdentifier: "CollectionHeadView", for: indexPath)
headView.backgroundColor = .systemRed
return headView
default:
let footerView = collectionView.dequeueReusableSupplementaryView(ofKind: UICollectionElementKindSectionFooter, withReuseIdentifier: "UICollectionReusableView", for: indexPath)
footerView.backgroundColor = .systemOrange
return footerView
}
}
}
4.实现LZTagLayout 的 LZTagLayoutDelegate
extension RoundViewController: LZTagLayoutDelegate {
/// 标签内边距
func tagLayout(_ layout: LZTagLayout, collectionView: UICollectionView, tagInnerMarginForItemAt indexPath: IndexPath) -> CGFloat {
return CGFloat(25)
}
func tagLayout(_ layout: LZTagLayout, collectionView: UICollectionView, sizeForSupplementaryElementOfKind kind: String, at section: Int) -> CGSize {
switch kind {
case UICollectionElementKindSectionHeader:
return CGSize(width: 250, height: 30)
case UICollectionElementKindSectionFooter:
return CGSize(width: 250, height: 40)
default:
return CGSize(width: 250, height: 40)
}
}
func tagLayout(_ layout: LZTagLayout, collectionView: UICollectionView, textForItemAt indexPath: IndexPath) -> String {
return self.titles[indexPath.row]
}
}
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1.0.8 secionInset 添加