UICollectionView Crashes on iOS 18 with Xcode 16: Troubleshooting Guide

UICollectionView Crashes on iOS 18 with Xcode 16: Troubleshooting Guide

 

기존 운영중인 코드에서 Xcode 16, iOS 18 에서만 UICollectionView 크래시 발생

 

크래시 상황 분석

상황 분석

• Xcode 16 + iOS 17.7 ✅ 크래시 미발생
• Xcode 16 + iOS 18 + ❌ 크래시 발생

즉, Xcode 16과 iOS 18 기기 한정해서 발생하는 걸로 보임.

 

크래시 현상 재현 코드

deque를 2회이상 수행하면 크래시가 발생.

import UIKit

class ViewController: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource, UICollectionViewDelegateFlowLayout {
   
    override func viewDidLoad() {
        super.viewDidLoad()
        
        configureUI()
    }
    
    private lazy var collectionView: UICollectionView = {
        let layout = UICollectionViewFlowLayout()
        let cv = UICollectionView(frame: .zero, collectionViewLayout: layout)
        
        cv.delegate = self
        cv.dataSource = self
        
        cv.register(CellA.self, forCellWithReuseIdentifier: CellA.id)
        cv.register(CellB.self, forCellWithReuseIdentifier: CellB.id)
        
        return cv
    }()
    
    private func configureUI() {
        view.addSubview(collectionView)
        collectionView.translatesAutoresizingMaskIntoConstraints = false
        NSLayoutConstraint.activate([
            collectionView.topAnchor.constraint(equalTo: view.topAnchor),
            collectionView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            collectionView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
            collectionView.bottomAnchor.constraint(equalTo: view.bottomAnchor)
        ])
    }
    
    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
        return 2
    }
    
    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        // ❌ Crash
        let cellA = collectionView.dequeueReusableCell(withReuseIdentifier: CellA.id, for: indexPath)
        let cellB = collectionView.dequeueReusableCell(withReuseIdentifier: CellB.id, for: indexPath)
        
        return UICollectionViewCell()
    }
    
    func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
        return .init(width: 100, height: 100)
    }
}

class CellA: UICollectionViewCell {
    static let id: String = String(describing: CellA.self)
}

class CellB: UICollectionViewCell {
    static let id: String = String(describing: CellB.self)
}

 

 

 

스크린샷

Crash Image