How to use multiple arrays of items in one collectionView? - ios

Question

I have one UICollectionView in my UIView. What I'm trying to do is when user press the button then other items(images array) appear on same UICollectionView.
Let's say I have two arrays of items:
let items = [UIImage(named: "moses-vega-436582-unsplash"),
UIImage(named: "april6"), UIImage(named: "april4"), UIImage(named:
"april5")]
let items2 = [UIImage(named: "test01"), UIImage(named: "test02")]
Now when user press the button I want to update my collectionView with images from items2. I'm using basic code for collections (it's easy for me to detect which labels for example to show. Because I have variable called "Testas" and if it's 0 then I know that it's default collectionView and else it's .... :
func collectionView(_ collectionView: UICollectionView,
numberOfItemsInSection section: Int) -> Int {
return items.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! CollectionViewCell
if Testas == 0 {
cell.image.image = items[indexPath.item]
if indexPath.item == 0 {
cell.label.text = "One"
}
if indexPath.item == 1 {
cell.label.text = "Two"
}
if indexPath.item == 2 {
cell.label.text = "Collection 3"
}
if indexPath.item == 3 {
cell.label.text = "Rainy Days"
}
} else {
cell.image.image = items2[indexPath.item]
if indexPath.item == 0 {
cell.label.text = "White"
}
if indexPath.item == 1 {
cell.label.text = "Blue"
}
}
return cell
}
In conclusion, I'm asking what I need to write to pass items2 into collectionView when the user press the button and how to make this collectionView appear? (because it's not a function or something what I could call easily I guess). Keep in mind that I have a function where it counts items. So that's the biggest problem. I need a function to count my items2 when user press the button and then make images appear.
Thank you so much. Maybe it's not even possible to make what I want this way. I don't know.

Answer 1

You could accomplish this easily by creating an enum, and then simply toggling it's value when the button is pressed followed by a collectionView.reloadData()
Here is your enum:
enum ItemType : Int {
case items = 0,
items2 = 1
}
Declare it like this:
var itemType : ItemType = .items
Your collectionView functions would look something like this:
func collectionView(_ collectionView: UICollectionView,
numberOfItemsInSection section: Int) -> Int {
return itemType == .items ? items.count : items2.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! CollectionViewCell
switch itemType {
case .items:
// code for items array
default:
// code for items2 array
}
return cell
}
Your button press:
#IBAction func onButtonPressed(_ sender: Any) {
itemType = .items2
collectionView.reloadData()
}
If you have more than 2 arrays you will need to update your collectionView functions to something like this:
func collectionView(_ collectionView: UICollectionView,
numberOfItemsInSection section: Int) -> Int {
switch itemType {
case .items:
return items.count
case .items2:
return items2.count
case .items3:
return items3.count
default:
return items4.count
}
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! CollectionViewCell
switch itemType {
case .items:
// code for items array
case .items2:
// code for items2 array
case .items3:
// code for items3 array
default:
// code for items4 array
}
return cell
}