ios - 为什么在集合视图的最后一个单元格结束后我会获得额外的空间？

Question

在我的收藏视图中，我在最后一个单元格的末尾获得了额外的空间。如果细胞数量增加，空间也会增加。集合视图的背景颜色为黄色。我怎样才能停止这个额外的空间？在第二张图片中，单元格的高度和宽度是集合视图的一半。

r] 2

这是我的 ViewController.swift 文件代码

import UIKit

class ViewController: UIViewController ,UICollectionViewDataSource,UICollectionViewDelegate,UICollectionViewDelegateFlowLayout{

    @IBOutlet weak var collectionview: UICollectionView!
    @IBOutlet weak var pagecontrol: UIPageControl!
    @IBOutlet weak var VarBtnGet: UIButton!
    @IBOutlet var MainView: UIView!
    @IBOutlet weak var ScrollView: UIScrollView!
    @IBOutlet weak var SubScrollView: UIView!
    override func viewDidLoad() {
        super.viewDidLoad()
        btnsetuplayout()
        pagecontrolsetup()
        collectionview.dataSource = self
        collectionview.delegate  = self
        collectionviewsetup()




    }
    func numberOfSections(in collectionView: UICollectionView) -> Int {
        return 1
    }
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 5

    }
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell
    {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "CollectionCell", for: indexPath)
        cell.backgroundColor = indexPath.item % 2 == 0 ? .green : .red

        return cell

    }
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        return CGSize(width: collectionview.frame.width, height: collectionview.frame.height)
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
            return 0
    }
    func btnsetuplayout()
    {
        VarBtnGet.translatesAutoresizingMaskIntoConstraints = false
        VarBtnGet.bottomAnchor.constraint(equalTo:SubScrollView.bottomAnchor,constant: -5).isActive = true
               VarBtnGet.leftAnchor.constraint(equalTo: SubScrollView.leftAnchor ,constant: 0
               ).isActive = true
               VarBtnGet.rightAnchor.constraint(equalTo: SubScrollView.rightAnchor,constant: 0).isActive = true

    }
    func pagecontrolsetup()
    {
        pagecontrol.translatesAutoresizingMaskIntoConstraints = false
        pagecontrol.bottomAnchor.constraint(equalTo:  VarBtnGet.topAnchor,constant: -100  ).isActive = true
        pagecontrol.centerXAnchor.constraint(equalTo:  SubScrollView.centerXAnchor).isActive = true
        pagecontrol.backgroundColor = .brown


    }
    func collectionviewsetup()
    {

        collectionview.translatesAutoresizingMaskIntoConstraints = false
        collectionview.isPagingEnabled = true
     //   collectionview.frame =  CGRect.zero
        if let layout = collectionview.collectionViewLayout as? UICollectionViewFlowLayout {
            layout.scrollDirection = .horizontal
        }

        collectionview.backgroundColor = .yellow
        collectionview.topAnchor.constraint(equalTo : SubScrollView.topAnchor ,constant: 5 ).isActive = true

          collectionview.heightAnchor.constraint(equalTo: SubScrollView.heightAnchor,multiplier: 0.5).isActive = true
        collectionview.widthAnchor.constraint(equalTo:SubScrollView.widthAnchor).isActive = true

         //collectionview.leftAnchor.constraint(equalTo: SubScrollView.leftAnchor,constant: 5) .isActive=true
         //collectionview.rightAnchor.constraint(equalTo: SubScrollView.rightAnchor,constant: -5) .isActive=true
    }


    @IBAction func ButtonGet(_ sender: Any) {
    }

}

标签： iosswift

Answer 1

您是否检查了项目之间的最小间距并将其设置0为minimumInteritemSpacing？它默认为10.0所以可以解释你所看到的。我看到您将行距设置为0很好。