Create UICollectionView in Swift Programmatically

In this Swift code example, you will learn how to create and display UICollectionView in Swift Programmatically.

The Swift code example in this tutorial will cover the following:

• Create UICollectionView programmatically,
• Set UICollectionView layout UIEdgeInsets,
• Set UICollectionView item size(width and height),
• Set UICollectionView background color,
• Set UICollectionView Item background-color,
• Implement UICollectionView Delegate method didSelectItemAtIndexPath to handle an event when the user taps on one of the collection view items

Creating UICollectionView Programmatically

Below is a very simple code example in Swift that creates UICollectionView programmatically.

import UIKit
class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate {
    
    override func viewDidLoad() {
        super.viewDidLoad()
    }
    
    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        
        let layout: UICollectionViewFlowLayout = UICollectionViewFlowLayout()
        layout.sectionInset = UIEdgeInsets(top: 20, left: 10, bottom: 10, right: 10)
        layout.itemSize = CGSize(width: 60, height: 60)
        
        let myCollectionView:UICollectionView = UICollectionView(frame: self.view.frame, collectionViewLayout: layout)
        myCollectionView.dataSource = self
        myCollectionView.delegate = self
        myCollectionView.register(UICollectionViewCell.self, forCellWithReuseIdentifier: "MyCell")
        myCollectionView.backgroundColor = UIColor.white
        self.view.addSubview(myCollectionView)
    }
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 100
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        let myCell = collectionView.dequeueReusableCell(withReuseIdentifier: "MyCell", for: indexPath)
        myCell.backgroundColor = UIColor.blue
        return myCell
    }
    
    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath)
    {
        print("User tapped on item \(indexPath.row)")
    }
    
    
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
}

I hope this code example was helpful for you. There are a lot more Swift code examples on this web site if you check the  Swift Code Examples page.

Additionally, you might also want to check a list of recent Swift tutorials where you will also find a list of useful resources for iOS mobile app developers.