[TIL] 2021.03.29

👩🏻‍💻 오늘 공부한 내용

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CollectionViewCell Button Handler

collectionview에 button을 넣으면 delegate가 안먹힌다..😱 delegate 대신 handler를 사용하여 클릭 이벤트를 구현해보자.

1. CollectionViewCell 클래스에 Handler를 추가해주자

class NumberCell: UICollectionViewCell{
    @IBOutlet weak var numberButton: UIButton!
    
    var clickButtonTapHandler: (() -> Void)? // ---> 추가
    
    func updateHidden(){
        numberButton.isHidden = true
    }
    
    func updateUI(_ num: Int){
        numberButton.setTitle(String(num), for: .normal)
    }
    
    // ---> 추가
    // IBAction 연결 
    @IBAction func clickButtonTapped(_ sender: Any) {
    	// 버튼 클릭시 clickButtonTapHandler 호출
        clickButtonTapHandler?()
    }
}

2. clickButtonTapHandler를 정의해주자

extension GameViewController: UICollectionViewDataSource {
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 9
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        guard let cell = numberCollectionView.dequeueReusableCell(withReuseIdentifier: "NumberCell", for: indexPath) as? NumberCell else { return UICollectionViewCell() }
        
        if cellisHidden[indexPath.item] == 1 {
            cell.updateHidden()
        } else {
            cell.updateUI(indexPath.item + 1)
        }
        
        // ---> clickButtonTapHandler 정의
        cell.clickButtonTapHandler = {
            if self.cellisHidden[indexPath.item] == 0{
                NotificationCenter.default.post(name: self.ClickNumberNotification, object: nil, userInfo: ["num" : indexPath.item + 1])
            }
        }
        
        return cell
    }
}