Question

我正在尝试将我的collectionView转换为IGListKit CollectionView。我收到错误消息：<build>

这是保存collectionView的viewController代码：

<reporting>

和我的mvn site

<?xml version="1.0" encoding="UTF-8"?>
<project>
  <modelVersion>4.0.0</modelVersion>
  <groupId>com.example</groupId>
  <artifactId>mylib</artifactId>
  <version>1.0</version>

  <build> 
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-checkstyle-plugin</artifactId>
            <version>3.0.0</version>
            <dependencies>
                <dependency>
                    <groupId>com.puppycrawl.tools</groupId>
                    <artifactId>checkstyle</artifactId>
                    <version>8.15</version> <!-- Update from default 6.18 to 8.15 -->
                </dependency>
            </dependencies>
        </plugin>
    </plugins>
  </build>

  <reporting>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-checkstyle-plugin</artifactId>
        <version>3.0.0</version>

        <!-- Uncommenting will cause syntax error, Dependencies can't be declared in reporting -->
        <!-- <dependencies>
          <dependency>
            <groupId>com.puppycrawl.tools</groupId>
            <artifactId>checkstyle</artifactId>
            <version>8.15</version>
          </dependency>
        </dependencies> --> 

      </plugin>
    </plugins>
  </reporting>
</project>

我真的不明白为什么会发生此错误。 Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Invalid parameter not satisfying: indexPath != nil'数组也不为空，collectionViewCell正在从控制台中的单元格打印信息，因此我知道对象（import UIKit import IGListKit import Firebase import SAMCache class NewHomeViewController: UIViewController { @IBOutlet weak var collectionView: UICollectionView! var sectionCategories: [String] = ["Friends Lists", "Friends", "People"] var lists = [Media]() lazy var adapter: ListAdapter = { return ListAdapter(updater: ListAdapterUpdater(), viewController: self, workingRangeSize: 0) }() override func viewDidLoad() { super.viewDidLoad() self.collectionView.collectionViewLayout = UICollectionViewLayout() adapter.collectionView = collectionView adapter.dataSource = self // check if the user logged in or not Auth.auth().addStateDidChangeListener { (auth, user) in if let user = user { // signed in WADatabaseReference.users(uid: user.uid).reference().observeSingleEvent(of: .value, with: { (snapshot) in if let userDict = snapshot.value as? [String : Any] { self.currentUser = User(dictionary: userDict) print("user is signed in2") //load the media if self.currentUser != nil { DispatchQueue.main.async { self.observeMedia() } } } }) print("user is signed in") } else { print("user is not signed in") self.performSegue(withIdentifier: Storyboard.showWelcome, sender: nil) } } } func observeMedia() { Media.observeNewMedia { (media) in print("observed") if !self.lists.contains(media) { self.lists.insert(media, at: 0) print("adding") print("\(self.lists.count)") self.adapter.performUpdates(animated: true, completion: nil) } } } } extension NewHomeViewController: ListAdapterDataSource { func objects(for listAdapter: ListAdapter) -> [ListDiffable] { let feedItems: [ListDiffable] = lists return feedItems } func listAdapter(_ listAdapter: ListAdapter, sectionControllerFor object: Any) -> ListSectionController { return postSectionController() } func emptyView(for listAdapter: ListAdapter) -> UIView? { let view = UIView() view.backgroundColor = .red return view } }）也不为空。这是我第一次实现IGListKit，所以我不知道是否丢失了任何东西。有人可以帮忙吗？

我尝试使用类postSectionController将collectionView更改为普通视图，但这会产生与标题相同的错误。在正常的collectionView中，我的UICollectionViewCell类和笔尖都可以工作

Answer 1

是因为您的UICollectionViewLayout应该是UICollectionViewFlowLayout。

由于未捕获的异常'NSInternalInconsistencyException'而终止应用程序，原因：'无效的参数不令人满意：indexPath！= nil'

1 个答案: