Question

如何在JSQMessageController中处理删除操作，我已经实现了方法

override func collectionView(collectionView: JSQMessagesCollectionView!, didDeleteMessageAtIndexPath indexPath: NSIndexPath!) {

     self.collectionView?.deleteItemsAtIndexPaths([indexPath])

}

还覆盖方法

override func collectionView(collectionView: UICollectionView, shouldShowMenuForItemAtIndexPath indexPath: NSIndexPath) -> Bool {
   // Do the custom JSQM stuff
    super.collectionView(collectionView, shouldShowMenuForItemAtIndexPath: indexPath)
  // And return true for all message types (we don't want the long press menu disabled for any message types)
  return true
}

override func collectionView(collectionView: UICollectionView, canPerformAction action: Selector, forItemAtIndexPath indexPath: NSIndexPath, withSender sender: AnyObject?) -> Bool {
   super.collectionView(collectionView, canPerformAction: action, forItemAtIndexPath: indexPath, withSender: sender)
   return true
}

override func collectionView(collectionView: UICollectionView, performAction action: Selector, forItemAtIndexPath indexPath: NSIndexPath, withSender sender: AnyObject?) {
  super.collectionView(collectionView, performAction: action, forItemAtIndexPath: indexPath, withSender: sender)
}

但是我在菜单项上崩溃还有什么工作要做，任何帮助都会受到赞赏，提前谢谢。

Answer 1

从特定索引路径的数组或字典中删除数据。
重新加载集合视图数据。

override func collectionView(collectionView: JSQMessagesCollectionView!, didDeleteMessageAtIndexPath indexPath: NSIndexPath!) 
{

     //Code for delete data from array or dictionary
     [JSQMessagesCollectionView reloaddata];

}

Answer 2

reloadData有一个很好的解决方法，但问题是其他的......

有人说你改变了dataSource数组，并且在调用deleteItemsAtIndexPaths之前没有在collectionView中完成更改。

Answer 3

查看JSQMessagesViewController.m的源代码：

- (void)collectionView:(JSQMessagesCollectionView *)collectionView performAction:(SEL)action forItemAtIndexPath:(NSIndexPath *)indexPath withSender:(id)sender
{
    if (action == @selector(copy:)) {
        id<JSQMessageData> messageData = [collectionView.dataSource collectionView:collectionView messageDataForItemAtIndexPath:indexPath];
        [[UIPasteboard generalPasteboard] setString:[messageData text]];
    }
    else if (action == @selector(delete:)) {
        [collectionView.dataSource collectionView:collectionView didDeleteMessageAtIndexPath:indexPath];

        [collectionView deleteItemsAtIndexPaths:@[indexPath]];
        [collectionView.collectionViewLayout invalidateLayout];
    }
}

所以你不应该打电话

self.collectionView？.deleteItemsAtIndexPaths（[indexPath]）

这

override func collectionView(collectionView: JSQMessagesCollectionView!, didDeleteMessageAtIndexPath indexPath: NSIndexPath!)

您只应该使用此方法从数据源中删除消息。

使用JSQMessageViewController删除消息

3 个答案: