1061646448596_.pic.jpg
当我们拿到像这样的设计图，我们就可以用collectionView来轻松实现
遵守collectionView的协议
class AncientBookClassVC: BaseViewController,UICollectionViewDelegate,UICollectionViewDataSource,UICollectionViewDelegateFlowLayout
懒加载创建collectionView
private let AncientBookCellID = "AncientBooksRightCell"
private let AncientBookHeadID = "AncientBookClassHead"
lazy var classCollectView : UICollectionView = {
//设置布局
let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout.init()
let itemSpac = (kScreenWidth - 60 - 14 - (59*4)) / 3
layout.scrollDirection = .vertical //竖直
layout.itemSize = CGSize.init(width: 59, height: 142)
layout.minimumInteritemSpacing = itemSpac //item 间距
layout.minimumLineSpacing = 5
layout.sectionInset = .init(top: 5, left: 30, bottom: 0, right: 30)
let collectView = UICollectionView.init(frame: .zero, collectionViewLayout: layout)
collectView.delegate = self
collectView.dataSource = self
collectView.backgroundColor = .white.withAlphaComponent(0)
collectView.showsVerticalScrollIndicator = false
//注册cell、 header、 Footer
collectView.register(AncientBooksRightCell.self, forCellWithReuseIdentifier: AncientBookCellID)
collectView.register(AncientBookClassHead.self, forSupplementaryViewOfKind: UICollectionView.elementKindSectionHeader, withReuseIdentifier: AncientBookHeadID)
collectView.register(UICollectionReusableView.self, forSupplementaryViewOfKind: UICollectionView.elementKindSectionFooter, withReuseIdentifier: "foot")
layerView.addSubview(collectView)
return collectView
}()
必须实现的两个代理
- 设置每组显示的item 数量
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return dataArray.count
}
- 设置UICollectionViewCell
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: AncientBookCellID, for: indexPath) as! AncientBooksRightCell
let model = dataArray[indexPath.row]
cell.titleLab.text = model?.name
cell.subTitleLab.text = model?.content
return cell
}
其他常用代理简介
- 点击item响应
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
}
- 设置组的数量(默认 1组)
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
- 设置组header size
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
return CGSize.init(width: kScreenWidth-14, height: 84)
}
- 设置组Footer size
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForFooterInSection section: Int) -> CGSize {
return CGSize.init(width: kScreenWidth, height: 0.001)
}
- 设置组headerView & FooterView
func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
if kind == UICollectionView.elementKindSectionHeader {
let head = collectionView.dequeueReusableSupplementaryView(ofKind: UICollectionView.elementKindSectionHeader, withReuseIdentifier: AncientBookHeadID, for: indexPath) as! AncientBookClassHead
return head
}else{
let footerView = collectionView.dequeueReusableSupplementaryView(ofKind: kind, withReuseIdentifier: "foot", for: indexPath)
return footerView
}
}
自定义 UICollectionViewCell
import UIKit
class AncientBooksRightCell: UICollectionViewCell {
lazy var topLineView: UIView = {
let line = UIView()
line.backgroundColor = UIColor.init(hexString: "#E5DFCF")
contentView.addSubview(line)
return line
}()
lazy var titleLab: UILabel = {
let lab = UILabel()
lab.text = "易类"
lab.textColor = UIColor.init(hexString: "#060606")
lab.font = UIFont.systemFont(ofSize: 21)
lab.textAlignment = .center
lab.numberOfLines = 0
contentView.addSubview(lab)
return lab
}()
lazy var subTitleLab: UILabel = {
let lab = UILabel()
lab.text = "昔在帝尧"
lab.textColor = UIColor.init(hexString: "#7D7A76")
lab.font = UIFont.systemFont(ofSize: 13)
lab.textAlignment = .center
lab.numberOfLines = 0
contentView.addSubview(lab)
return lab
}()
override init(frame: CGRect) {
super.init(frame: frame)
initUI()
}
func initUI()
{
topLineView.snp.makeConstraints { make in
make.left.right.top.equalToSuperview()
make.height.equalTo(2)
}
titleLab.snp.makeConstraints { make in
make.left.equalToSuperview().offset(7)
make.top.equalTo(topLineView.snp.bottom).offset(14)
make.width.equalTo(19)
make.bottom.lessThanOrEqualToSuperview()
}
subTitleLab.snp.makeConstraints { make in
make.right.equalToSuperview().offset(-11)
make.top.equalTo(titleLab.snp.top)
make.width.equalTo(12)
}
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
自定义Header
import UIKit
class AncientBookClassHead: UICollectionReusableView {
lazy var gridView: TitleGridView = {
let grid = TitleGridView.init(frame: .zero)
self.addSubview(grid)
return grid
}()
override init(frame: CGRect) {
super.init(frame: frame)
gridView.snp.makeConstraints { make in
make.top.equalToSuperview().offset(19)
make.left.right.equalToSuperview()
}
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
注意! Header 和 Footer 出现一定是配对的，像这样的需要看着只需要实现header，但是也得加个隐藏的Footer，不知道原因，只是经验之谈😂
