Swift UICollectionView 工作奇怪，只注册第二次点击

Posted 2023-03-11

【中文标题】Swift UICollectionView 工作奇怪，只注册第二次点击

【英文标题】：Swift UICollectionView works strange, registers only second tap

【发布时间】：2019-11-19 18:59:44

【问题描述】：

我正在 Xcode 11 项目中实现一个集合视图，发生的情况是只有第二次点击被注册。当用户点击左侧单元格时，它不会打开详细信息屏幕，当用户下次点击右侧单元格时，左侧单元格会打开，这是非常奇怪的行为。我不使用故事板只是编程方法。这是我的代码：

let collectionView: UICollectionView = 
    let layout = UICollectionViewFlowLayout()
    layout.scrollDirection = .vertical
    let cv = UICollectionView(frame: .zero, collectionViewLayout: layout)
    cv.translatesAutoresizingMaskIntoConstraints = false
    cv.register(CustomCollectionViewCell.self, forCellWithReuseIdentifier: "cell")
    return cv   
()

func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize 
    return CGSize(width: 150, height: 150)



func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int 
    return myData.count


func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell 
    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! CustomCollectionViewCell
    cell.backgroundColor = .white
    cell.data = myData[indexPath.item]

    return cell



func collectionView(_ collectionView: UICollectionView, didDeselectItemAt indexPath: IndexPath) 
    let newViewController = SecondViewController(data: myData[indexPath.item])
    self.navigationController?.pushViewController(SecondViewController, animated: true)

【参考方案1】：

替换（didDeselectItemAt 不是 didSelectItemAt）

func collectionView(_ collectionView: UICollectionView, didDeselectItemAt indexPath: IndexPath) 

与

func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath)  

应该也是

let newViewController = SecondViewController(data: myData[indexPath.item])
self.navigationController?.pushViewController(newViewController, animated: true)