I am very new to swift. So TLDR I have a collection view which I want to update after I click a button. I have seen various solutions and everyone suggesting to put collectionView.reloadData but I am not understanding where to put this line in my code. Any help will be appreciated. This is the view controller:
class myViewController: UIViewController {
@IBOutlet weak var myCollectionView: UICollectionView!
var charList: Array<String> = []
var data: String = ""
var songTiles = [
"teri meri": ["D", "A", "G", "A", "F", "G", "A", "F", "G", "A", "G", "F", "E", "D", "E", "D", "C", "D", "E", "F", "E", "F", "E", "G", "A", "G", "F", "E", "D", "D"],
"faded": ["B", "A", "B", "A"],
"darmiyan": ["A", "B", "B", "A"],
"hangover": ["B", "A", "B", "A"],
"dna": ["A", "A", "A", "A"],
"fire": ["A", "B", "B", "A"],
"springday": ["C", "A", "A", "A"],
"gotcha": ["C", "A", "A", "A"],
"aurora": ["C", "A", "A", "A"],
"fadedremix": ["A", "B", "A", "B"]
]
@IBOutlet weak var chosenSong: UILabel!
@IBAction func keyNote(_ sender: UIButton) {
if (sender.currentTitle == charList[0]) {
charList.removeFirst()
print("Correct!")
playSound(sound: sender.currentTitle!)
}
}
func playSound(sound: String) {
guard let url = Bundle.main.url(forResource: sound, withExtension: "wav") else {
return
}
do {
try AVAudioSession.sharedInstance().setCategory(.playback, mode: .default)
try AVAudioSession.sharedInstance().setActive(true)
player = try AVAudioPlayer(contentsOf: url, fileTypeHint: AVFileType.mp3.rawValue)
guard let player = player else { return }
player.play()
} catch let error {
print(error.localizedDescription)
}
}
var player: AVAudioPlayer?
override func viewDidLoad() {
super.viewDidLoad()
charList = songTiles[data]!
chosenSong.text = data
// Do any additional setup after loading the view.
}
}
extension myViewController: UICollectionViewDataSource, UICollectionViewDelegate {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return charList.count
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
myCollectionView.reloadItems(at: [indexPath])
let cell = myCollectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! myCollectionViewCell
cell.myImage.image = UIImage(named: charList[indexPath.row])
myCollectionView.reloadItems(at: [indexPath])
return cell
}
}
So the way this code works is it deletes the character from the start of the array that user has selected each time user presses the button correctly. For eg if I choose Array Faded and I press A the Array in the UIControllerView should remove A and update collection view accordingly. Think of it as a tutorial of learning songs on xylophone. Any help would be appreciated. Thanks.
You can try like this
@IBAction func keyNote(_ sender: UIButton) {
if (sender.currentTitle == charList[0]) {
charList.removeFirst()
print("Correct!")
let theIndex = IndexPath(row: 0, section: 0)
myCollectionView.deleteItems(at: [theIndex])
playSound(sound: sender.currentTitle!)
}
}