how to set collection view cell as equal row cell for all screen

Question

i am using swift 2.o collection view. In that every thing is working fine. But when i run in different screen , the width gap between each cell are different. I need three cell in each row of collection view with 8 px gap for left,right,top,bottom for all cell in collection view. And also i need to set the cell as corner radius. i need like below image : [![enter image description here][1]][1]

But when i run in 5s screen i am getting like this and for 6 screen like 2nd image :

[![enter image description here][2]][2]

iphone 6 :

[![enter image description here][3]][3]

See the gap between left, right, bottom , top are not equally sapced as like my first image. i need to get like my first image.

I set the min line space for cell is 6 in storyboard. But i not able to get like my first imge.

please help me out.

my popvc.swift :

import UIKit

class popVC: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate {

    var tableData: [String] = ["RESTAURANTS", "BANKS", "COFFEE","PIZZA", "HOTELS", "TAXI", "RESTAURANTS", "BANKS","COFFEE","PIZZA", "HOTELS", "TAXI","RESTAURANTS", "BANKS", "COFFEE","PIZZA", "HOTELS", "TAXI"]
    var tableImages: [String] = ["img1.png", "img2.png", "img3.png", "img4.png", "img5.png", "img6.png", "img7.png", "img8.png", "img9.png", "img10.png", "img11.png", "img11.png", "img1.png", "img2.png", "img3.png", "img4.png", "img5.png", "img6.png"]

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return tableData.count
    }

    func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
        let cell: colvwCell = collectionView.dequeueReusableCellWithReuseIdentifier("Cell", forIndexPath: indexPath) as! colvwCell
        cell.lblCell.text = tableData[indexPath.row]
        cell.imgCell.image = UIImage(named: tableImages[indexPath.row])
        return cell
    }

    func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
        print("Cell \(indexPath.row) selected")
    }


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


}

Answer 1

read this tutorial. it will fulfill your requirement

Answer 2

From the storyboard set CollectionViews Section Inset from size inspector as Top = 8, Bottom = 8, Left = 8 and Right = 8, it should look like as

And return size for cell as

- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath {

   //If you want your cell should be square in size the return the equal height and width, and make sure you deduct the Section Inset from it.
   return CGSizeMake((self.view.frame.size.width/3) - 16, (self.view.frame.size.width/3) - 45);
}

Thats it, Nothing more. You should see the result as mine:

Answer 3

@user5513630 Add following code in collection view.

func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
        let size = UIScreen.mainScreen().bounds.size

// 8 - space between 3 collection cells
// 4 - 4 times gap will appear between cell.
        return CGSize(width: (size.width - 4 * 8)/3, height: 40)

    }

Answer 4

Create a collection view using following code:

@IBOutlet var collectionView: UICollectionView?
    var screenSize: CGRect!
    var screenWidth: CGFloat!
    var screenHeight: CGFloat!

 override func viewDidLoad() {


        print("select block is \(self.strBlockname)")

        screenSize = UIScreen.mainScreen().bounds
        screenWidth = screenSize.width
        screenHeight = screenSize.height
        let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
        layout.sectionInset = UIEdgeInsets(top: 10, left: 0, bottom: 10, right: 0)
        layout.itemSize = CGSize(width: (screenWidth/3)-1, height: (screenWidth/3)-1)
        layout.minimumInteritemSpacing = 1
        layout.minimumLineSpacing = 1
        collectionView = UICollectionView(frame: CGRectMake(0, 0, screenWidth, screenHeight-65), collectionViewLayout: layout)
        collectionView!.dataSource = self
        collectionView!.delegate = self
        collectionView!.registerClass(CollectionViewCell.self, forCellWithReuseIdentifier: "CollectionViewCell")
        collectionView!.backgroundColor = UIColor.whiteColor()
        self.view.addSubview(collectionView!)

        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

 func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
        return 1
    }

    func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 20
    }





    func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
        let cell = collectionView.dequeueReusableCellWithReuseIdentifier("CollectionViewCell", forIndexPath: indexPath) as! CollectionViewCell
        cell.backgroundColor = UIColor.blackColor()
        cell.textLabel?.text = "\(indexPath.section):\(indexPath.row)"
        cell.imageView?.image = UIImage(named: "circle")
        return cell
    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

Its Output for iPhone5s,6s and 6+ is following:

iPhone5s

iPhone6s