Swift 3: Remove specific string from array without knowing the indexPath? - arrays

Question

I have a UICollectionView that has a bunch of cells. When I select these cells, they change color to look as if they have clearly been selected and I append that hashtag.hashtag_name (String) to my hashtagsArray. If I tap a category (fashion, food, hobbies or music), I append another array to that index path to give the user the cells for that specific category as you can see in my image example below.
What I would like is if I tap a already SELECTED cell to UNSELECT it, for that hashtag.hashtag_name to be removed from my hashtagArray. The issue is that the indexPath for the array that I add in is completely different to the array indexPath when I append it into the hashtagArray so I cannot remove it by calling self.hashtagArray.remove(Int). Here's my code...
import UIKit
class Hashtag: NSObject {
var hashtag_name: String?
var hashtag_color: String?
}
import UIKit
private let reuseIdentifier = "Cell"
class HashtagView: UICollectionViewController, UICollectionViewDelegateFlowLayout {
var hashtagArray: [String] = []
var categoriesArray = [Hashtag]()
var fashionArray = [Hashtag]()
var isFashionSelected: Bool = false
var fashionArrayCount: [Int] = []
override func viewDidLoad() {
super.viewDidLoad()
self.navigationController?.navigationBar.tintColor = .white
navigationItem.title = "Hashtag"
self.collectionView?.backgroundColor = .white
self.collectionView?.register(HashtagCell.self, forCellWithReuseIdentifier: reuseIdentifier)
self.collectionView?.contentInset = UIEdgeInsetsMake(10, 0, 0, 0)
handleFetchCategories()
handleFetchFashionHashtags()
}
func insertCategoryAtIndexPath(element: [Hashtag], index: Int) {
categoriesArray.insert(contentsOf: element, at: index)
}
override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let cell = self.collectionView?.cellForItem(at: indexPath) as! HashtagCell
let hashtag = categoriesArray[indexPath.item]
if hashtag.hashtag_name == "FASHION" && isFashionSelected == false {
self.isFashionSelected = true
self.insertCategoryAtIndexPath(element: self.fashionArray, index: indexPath.item + 1)
self.collectionView?.reloadData()
} else if hashtag.hashtag_name == "FASHION" && isFashionSelected == true {
self.isFashionSelected = false
self.categoriesArray.remove(at: self.fashionArrayCount)
self.collectionView?.reloadData()
}
if hashtag.hashtag_name != "FASHION" && hashtag.hashtag_name != "FOOD" && hashtag.hashtag_name != "HOBBIES" && hashtag.hashtag_name != "MUSIC" {
if cell.isCellSelected == false {
cell.isCellSelected = true
if self.hashtagArray.contains(hashtag.hashtag_name!) {
cell.backgroundColor = .white
cell.hashtagLabel.textColor = greenColor
cell.layer.borderColor = greenColor.cgColor
} else {
self.hashtagArray.append(hashtag.hashtag_name!)
}
cell.backgroundColor = .white
cell.hashtagLabel.textColor = greenColor
cell.layer.borderColor = greenColor.cgColor
} else if cell.isCellSelected == true {
cell.isCellSelected = false
// REMOVE UNSELECTED CELL FROM ARRAY.
cell.backgroundColor = greenColor
cell.hashtagLabel.textColor = .white
cell.layer.borderColor = greenColor.cgColor
}
}
}

Answer 1

You can use the index(of: ) method on the array to get the index
if let index = hashtagArray.index(of: "SOMESTRING") {
hashtagArray.remove(at: index)
}

Answer 2

myArray = ["One","Two","Three","Four"]
myArray = myArray.filter{$0 != "Three"}
This will remove the "Three" from myArray. Also look at the following link too:
https://stackoverflow.com/a/44358108/8048468

Answer 3

You could use Array's index(of:) function to get the index of a known element and then remove it using remove(at:).
You could use filter(_:​) to create a new array excluding elements which match some check.
You could look at similar questions and write your own extension method to remove an object by value as in Array extension to remove object by value