cellForItemAt如果我正在使用UICollectionViewDelegateFlowLayout,则不会调用IndexPath.这是iOS的错误吗？

概述cellForItemAt如果我正在使用UICollectionViewDelegateFlowLayout,则不会调用indexPath. 在这种情况下： class Something: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource {} 它调用我的cellforItemAtIndexPath, cellForItemAt如果我正在使用UICollectionVIEwDelegateFlowLayout,则不会调用indexPath.

在这种情况下：

class Something: UIVIEwController,UICollectionVIEwDelegate,UICollectionVIEwDataSource {}

它调用我的cellforItemAtIndexPath,但不调用我的

func collectionVIEw(_ collectionVIEw: UICollectionVIEw,layout collectionVIEwLayout: UICollectionVIEwLayout,sizeforItemAt indexPath: IndexPath) -> CGSize {}

但如果我包含UICollectionVIEwDelegateFlowLayout：

class Something: UIVIEwController,UICollectionVIEwDataSource,UICollectionVIEwDelegateFlowLayout {}

它会打电话给：

func collectionVIEw(_ collectionVIEw: UICollectionVIEw,sizeforItemAt indexPath: IndexPath) -> CGSize {}

但不会调用cellForItemAtIndexPath.我不明白这个问题.这是iOS的错误还是我看不到任何东西？

解决方法 试试这个代码.

import UIKitlet kSCREENWIDTH = UIScreen.main.bounds.size.wIDthlet kSCREENHEIGHT = UIScreen.main.bounds.size.heightlet ColLECTION_CELL = "collectionCell"class DemoController: UIVIEwController {    var collectionVIEw : UICollectionVIEw!    overrIDe func vIEwDIDLoad() {        super.vIEwDIDLoad()        setupCollectionVIEw()    }   /// create programatically collection vIEw   fileprivate func setupCollectionVIEw() {        let layout = UICollectionVIEwFlowLayout()//        layout.itemSize = CGSize(wIDth:(kSCREENWIDTH-20)/2,height:150)        layout.sectionInset = UIEdgeInsetsMake(5,7,5,7)        layout.minimumlinespacing = 5        layout.minimumInteritemSpacing = 1        collectionVIEw = UICollectionVIEw.init(frame: self.vIEw.bounds,collectionVIEwLayout: layout)        collectionVIEw.delegate = self        collectionVIEw.dataSource = self        collectionVIEw.backgroundcolor = UIcolor.white        self.vIEw .addSubvIEw(collectionVIEw)        collectionVIEw.register(UICollectionVIEwCell.self,forCellWithReuseIDentifIEr: ColLECTION_CELL)    }    overrIDe func dIDReceiveMemoryWarning() {        super.dIDReceiveMemoryWarning()        // dispose of any resources that can be recreated.    }}//MARK: UICollectionVIEwDelegateextension DemoController : UICollectionVIEwDelegate {    func collectionVIEw(_ collectionVIEw: UICollectionVIEw,numberOfItemsInSection section: Int) -> Int {        return 10    }    func collectionVIEw(_ collectionVIEw: UICollectionVIEw,dIDSelectItemAt indexPath: IndexPath) {            // add your code here    }}//MARK: UICollectionVIEwDataSourceextension DemoController : UICollectionVIEwDataSource {    func collectionVIEw(_ collectionVIEw: UICollectionVIEw,cellForItemAt indexPath: IndexPath) -> UICollectionVIEwCell {        /// add your code here        let cell = collectionVIEw.dequeueReusableCell(withReuseIDentifIEr: ColLECTION_CELL,for: indexPath)        cell.backgroundcolor = UIcolor.lightGray        print("Here cellForItemAt Works")        return cell    }}//MARK: UICollectionVIEwDelegateFlowLayoutextension DemoController : UICollectionVIEwDelegateFlowLayout {    func collectionVIEw(_ collectionVIEw: UICollectionVIEw,sizeforItemAt indexPath: IndexPath) -> CGSize {        print("Here sizeforItemAt Works")        return CGSize(wIDth: 150,height: 150)    }}

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