我将啥设置为表中的 collectionView 的数据源和委托

Posted 2023-03-14

【中文标题】我将啥设置为表中的 collectionView 的数据源和委托

【英文标题】：what do I set as the Datasource and delegate for a collectionView within a table我将什么设置为表中的 collectionView 的数据源和委托

【发布时间】：2016-11-27 18:02:45

【问题描述】：

我有一个视图控制器，它在原型单元格中包含一个表格和一个集合视图。我已将 VC 设置为 Table 的 DataSource 和 Delegate，但我的问题是我将什么设置为 CollectionView 的 Datasource 和 delegate

当我简单地对集合视图的部分数量等进行硬编码时，我的代码可以正常工作。但是，当我尝试从 plist 文件中读取数组时，出现问题并且每个部分都显示相同的图像 enter image description here

这是tableViewCell的代码

import UIKit

class CategoryRow: UITableViewCell 
var pictDataSource = PicDataSource()



// Mark: Set-up the CollectionView

extension CategoryRow: UICollectionViewDataSource 

func numberOfSections(in collectionView: UICollectionView) -> Int 

  return pictDataSource.numberOfSections


 func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int 
     return pictDataSource.numberOfPicsInSection(section)
  // return 12
 

 func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell 
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "videoCell", for: indexPath) as! CategoryRowCollectionViewCell
    if let picc = pictDataSource.picForItemAtIndexPath(indexPath) 
     cell.pic = picc
  
    configreCell(cell, atIndexPath: indexPath)
    return cell
 

  func configreCell(_ cell: CategoryRowCollectionViewCell, atIndexPath indexPath: IndexPath) 
      cell.cellLabel.text = "\(indexPath.row)"
   


// Mark: Create the CollectionView flow layout

extension CategoryRow: UICollectionViewDelegateFlowLayout 

  func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize 
       let itemsPerRow: CGFloat = 4
       let hardCodedPadding: CGFloat = 5
       let itemWidth = (collectionView.bounds.width/itemsPerRow) - hardCodedPadding
       let itemHeight = collectionView.bounds.height - (2 * hardCodedPadding)
       return CGSize(width: itemWidth, height: itemHeight)
    

这是从 dataSource 读取的代码

//
//  PicDataSource.swift

import Foundation
import UIKit

class Pict 
 var caption: String
 var imageName: String
 var section: String
 var index: Int

 init(caption: String, imageName: String, section: String, index: Int) 
    self.caption = caption
    self.imageName = imageName
    self.section = section
    self.index = index
 
   convenience init(copying pic: Pict) 
      self.init(caption: pic.caption, imageName: pic.imageName, section: pic.section, index: pic.index)
   


class PicDataSource 

var pics: [Pict] = []
var sections: [String] = []
var immutablePics: [Pict] = []

var count: Int 
  return pics.count


var numberOfSections: Int 
  return sections.count


init() 
  pics = loadImagesFromDisk()
  immutablePics = pics



func loadImagesFromDisk() -> [Pict] 
  sections.removeAll(keepingCapacity: false)
  if let path = Bundle.main.path(forResource: "Images", ofType: "plist") 
     if let dictArray = NSArray(contentsOfFile: path) 
        // print ("DICTARRAY COUNT", dictArray.count)
        var pics: [Pict] = []
        for item in dictArray 
           if let dict = item as? NSDictionary 

              let caption = dict["caption"] as! String
              let imageName = dict["imageName"] as! String
              let section = dict["section"] as! String
              let index = dict["index"] as! Int

              let pic = Pict(caption: caption, imageName: imageName, section: section, index: index)
              if !sections.contains(section) 
                 sections.append(section)
              
              pics.append(pic)
           
        

        return pics.sorted  $0.section < $1.section 

     
  
  return []


func numberOfPicsInSection(_ index: Int) -> Int 
  let pics = picsForSection(index)
  return pics.count


func picForItemAtIndexPath(_ indexPath: IndexPath) -> Pict? 
  if indexPath.section > 0 
     let picss = picsForSection(indexPath.section)
     return picss[indexPath.item]
   else 
     return pics[indexPath.item]
  


func titleForSectionAtIndexPath(_ indexPath: IndexPath) -> String? 
  if indexPath.section < sections.count 
     return sections[indexPath.section]
  
  return nil



func picsForSection(_ index: Int) -> [Pict] 
    let section = sections[index]
    let picsInSection = pics.filter  (pic: Pict) -> Bool in
      return pic.section == section
    
      return picsInSection
   

视图控制器

import UIKit

class ViewController: UIViewController, UITableViewDataSource 

// var categories = ["Action", "Drama", "Science Fiction", "Kids", "Horror"]
var categories = PicDataSource()

 override func viewDidLoad() 
    super.viewDidLoad()
       

override func didReceiveMemoryWarning() 
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.


func numberOfSections(in tableView: UITableView) -> Int 

    return categories.numberOfSections


func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? 

    return categories.sections[section]



func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int 
    return 1


func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell 
    let cell = tableView.dequeueReusableCell(withIdentifier: "cell") as! CategoryRow
    return cell
    

如果有人对我做错了什么有任何想法或指示，我将不胜感激

【参考方案1】：

您将集合视图的dataSource 和delegate 设置为将实现UICollectionViewDataSource 和UICollectionViewDelegate 方法的任何类。这很可能与您的表格视图的dataSource 和delegate 使用相同的视图控制器，但不一定是。