Using CollectionView in UIView with xib file - ios

Question

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

Answer 1

The main way to use UICollectionView is by managing the logic programmatically.
First, create a new class which inherits from UICollectionViewCell. Choose if you want to include a xib to easily design your cell:
Design your cell with Interface Builder or programmatically.
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
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!
//...
}
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
}
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
}
Run your app in the simulator (or on a real device) and.. Et voilà! :)
For more info: https://developer.apple.com/reference/uikit/uicollectionview

Answer 2

ok first you must have the IBOutlet of your collection view and implements the methods like this
class ViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource,UICollectionViewDelegateFlowLayout{
#IBOutlet var collectionView: UICollectionView!
override func viewDidLoad() {
super.viewDidLoad()
count = 9;
let nib = UINib(nibName: "yourItemView", bundle: nil)
collectionView.registerNib(nib, forCellWithReuseIdentifier: "yourItemView")
self.collectionView.delegate = self
self.collectionView.dataSource = self
}
ok in the function you add a xib file, next you must create that extend from UICollectionViewCell, and when you finish this you must override the next methods
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return count
// the numbers of items
}
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {//size of your item for screen sizes
let wsize = UIScreen.mainScreen().bounds.size.width
switch(wsize){
case 414:
return CGSize(width: 190, height: 102)
case 375:
return CGSize(width: 190, height: 102)
case 320:
return CGSize(width: 174, height: 102)
default:
return CGSize(width: 174, height: 102)
}
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("yourItemView", forIndexPath: indexPath) as! yourItemView
return cell
}
and this is all, good luck