如何在所有设备中使用swift4在CollectionView中显示两列

Question

要在collectionView中只显示两列,我正在使用这段代码

    let layout = self.collectionView.collectionViewLayout as! UICollectionViewFlowLayout
    layout.sectionInset = UIEdgeInsetsMake(0, 0, 0, 0)
    layout.minimumInteritemSpacing = 4
    layout.itemSize = CGSize(width:(self.collectionView.frame.size.width - 10)/2,height: (self.collectionView.frame.size.height)/3)

但它只能在5s上正常显示,而不是在每个iphone上显示.请帮忙.

我想像这个图像一样显示我的视图控制器.请帮助任何人

Answer 1

你必须失踪 UICollectionViewDelegateFlowLayout

试试看,看看:

// Source code
import UIKit

class CollectionVC: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {

    @IBOutlet var collection: UICollectionView!
    override func viewDidLoad() {
        super.viewDidLoad()
        collection.delegate = self
        collection.dataSource = self
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        //collection.reloadData()
    }

    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        let flowayout = collectionViewLayout as? UICollectionViewFlowLayout
        let space: CGFloat = (flowayout?.minimumInteritemSpacing ?? 0.0) + (flowayout?.sectionInset.left ?? 0.0) + (flowayout?.sectionInset.right ?? 0.0)
        let size:CGFloat = (collection.frame.size.width - space) / 2.0
        return CGSize(width: size, height: size)
    }


    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 50
    }

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "testcell", for: indexPath)
        cell.backgroundColor = UIColor.red
        return cell
    }

}

//界面设计

结果:

Answer 2

确保您的协议确认您的ViewController，

class ViewController: UIViewController,UICollectionViewDelegate,UICollectionViewDataSource,UICollectionViewDelegateFlowLayout

并将流布局设置为您的collectionview对象

在视图中加载

let layout = UICollectionViewFlowLayout()
layout.scrollDirection = .vertical //.horizontal
layout.minimumLineSpacing = 5
layout.minimumInteritemSpacing = 5
collectionView.setCollectionViewLayout(layout, animated: true)

并实现以下方法

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, insetForSectionAt section: Int) -> UIEdgeInsets {
    return UIEdgeInsets(top: 1.0, left: 1.0, bottom: 1.0, right: 1.0)//here your custom value for spacing
}

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    let lay = collectionViewLayout as! UICollectionViewFlowLayout
    let widthPerItem = collectionView.frame.width / 2 - lay.minimumInteritemSpacing
    
    return CGSize(width:widthPerItem, height:100)
}

Answer 3

将此代码添加到viewDidLoad。根据你改变高度。

尝试这个！

if let layout = collectionView?.collectionViewLayout as? UICollectionViewFlowLayout{
        layout.minimumLineSpacing = 10
        layout.minimumInteritemSpacing = 10
        layout.sectionInset = UIEdgeInsets(top: 0, left: 10, bottom: 0, right: 10)
        let size = CGSize(width:(collectionView!.bounds.width-30)/2, height: 250)
        layout.itemSize = size
}