Using CollectionView in UIView with xib file

Thanh Hải picture Thanh Hải · Dec 16, 2016 · Viewed 23.9k times · Source

i'm doing with this, i want to use CollectionView, but i haven't seen prototype cell, and don't know how to use CollectionView in this case, can someone help me ?

I try to use like this way but it take alot of time and hard to manage than UICollectionView

enter image description here

Answer

Nicola Giancecchi picture Nicola Giancecchi · Dec 17, 2016

The main way to use UICollectionView is by managing the logic programmatically.

  1. First, create a new class which inherits from UICollectionViewCell. Choose if you want to include a xib to easily design your cell: enter image description here

  2. Design your cell with Interface Builder or programmatically.

  3. Create your main view controller including a xib (or a storyboard) with the collection view inside and link it to the associated class via Interface Builder. Alternatively you can add a collection view programmatically to your UIViewController

enter image description here

  1. Make the target view controller conform to the UICollectionViewDelegate and UICollectionViewDataSource protocols by declaring them after the father class:

    class ViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource {
    
        @IBOutlet weak var collectionView: UICollectionView!
    
        //...
    } 
    
  2. Register the associated nib or the class for your cell in the viewDidLoad method and associate the datasource and delegate protocols to the view controller class:

     let cellIdentifier = "cellIdentifier"
    
     override func viewDidLoad() {
         super.viewDidLoad()
         //if you use xibs:
          self.collectionView.register(UINib(nibName:"MyCollectionCell", bundle: nil), forCellWithReuseIdentifier: cellIdentifier)
         //or if you use class:
          self.collectionView.register(MyCollectionCell.self, forCellWithReuseIdentifier: cellIdentifier)
    
          self.collectionView.delegate = self
          self.collectionView.dataSource = self
     }
    
  3. Implement the methods declared in the UICollectionViewDelegate and UICollectionViewDataSource protocols :

     let objects = ["Cat", "Dog", "Fish"]
    
     func numberOfSections(in collectionView: UICollectionView) -> Int {
           return 1
     }
    
     func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
           return self.objects.count
     }
    
     func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
    
           let cell = collectionView.dequeueReusableCell(withReuseIdentifier: cellIdentifier, for: indexPath) as! MyCollectionCell
    
           //in this example I added a label named "title" into the MyCollectionCell class
           cell.title.text = self.objects[indexPath.item]
    
           return cell
     }
    
  4. Run your app in the simulator (or on a real device) and.. Et voilà! :)

enter image description here

For more info: https://developer.apple.com/reference/uikit/uicollectionview