How to show two columns in a CollectionView using

问题:

To show only two columns in a collectionView i am using this piece of code

    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)

but it is only showing properly on 5s, not on every iphone. please help.

i want to show my view controller like this image. please help anyone

回答1:

add this code to viewDidLoad. change height according to you.

try this!

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
}

回答2:

You must be missing UICollectionViewDelegateFlowLayout

Try this and see:

// 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
    }

}

// Interface Design

Result:

回答3:

Make sure your protocol confirms to your ViewController,

class ViewController: UIViewController,UICollectionViewDelegate,UICollectionViewDataSource,UICollectionViewDelegateFlowLayout

And set flow layout to your collectionview object

In viewDidLoad

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

And implement following methods

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)
}

回答4:

I have following code which I have implemented to display two column in collection view.

Add UICollectionViewDelegateFlowLayout’s following method method:

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
    let size = (collectionView.frame.size.width - 30) / 2
    return CGSize(width: size, height: size)
}

Where 30 stand for left, right and middle space between cell.

i.e Cell should be add 10 pixel on left Side, 10 pixel on right side and 10 pixel in between two cell.

Select you collectionview from storyboard and from Size Inspector set following minimum spacing.

I hope this will fix you issue.

Let me know if any query.