[英]Using storyboard?.instantiate returns “Unexpectedly found nil” error
我在使用storyboard?.instantiate
时遇到错误storyboard?.instantiate
。 它给了我这个错误:
线程1:致命错误:在解开Optional值时意外发现nil
这是我的代码:
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
let vc = storyboard?.instantiateViewController(withIdentifier: "SelectedViewController")
as? SelectedViewController
vc?.name = imgArr[indexPath.row]
self.navigationController?.pushViewController(vc!, animated: true)
}
我已经在这张照片中使用了标识符ID
:
请有人在这个问题上帮助我。
在集合视图的视图控制器的同一个故事板中是SelectedViewController吗?
我总是喜欢用后卫打开选项,或者让我们避免像这样崩溃。 您可以使用:
guard let viewController = storyboard?.instantiateViewController(withIdentifier: "SelectedViewController") as? SelectedViewController else { "return error here if wanted" return }
viewController.name = imgArr[indexPath.row]
self.navigationController?.pushViewController(viewController, animated: true)
试试以下代码:
let storyBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let vcTitles = storyBoard.instantiateViewController(withIdentifier: "vcTitles") as! VCTitlesViewController
self.navigationController?.pushViewController(vcTitles, animated: true)
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