但在刷新中会报错
* Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'attempt to delete row 2 from section 0 which only contains 2 rows before the update'
推测原因是 current Cell在刷新时的numberOfRowsInSection和刷新insert or del的cell时numberOfRowsInSection不一致导致 。然后尝试current cell和其他cell分别刷新，完美刷新。
[_reloadArray removeAllObjects];
[tableView reloadRowsAtIndexPaths:@[indexPath] withRowAnimation:UITableViewRowAnimationNone];
if (currentNode.isExpand) {
//expand
[self expandNodesForParentID:currentNode.childrenID insertIndex:indexPath.row];
[tableView insertRowsAtIndexPaths:_reloadArray withRowAnimation:UITableViewRowAnimationNone];
}else{
//fold
[self foldNodesForLevel:currentNode.level currentIndex:indexPath.row];
[tableView deleteRowsAtIndexPaths:_reloadArray withRowAnimation:UITableViewRowAnimationNone];
}
2.怎么保存节点历史状态
当文件级层比较多时，有时希望能关掉层级后再打开时还能保留子层级的打开状态。我们可以会给每一个node一个是否展开的属性，当fold时只修改currentNode的expand属性，expand时对子节点序isexpand＝YES的进行遍历插入。
//expand
- (NSUInteger)expandNodesForParentID:(NSString*)parentID insertIndex:(NSUInteger)insertIndex{
for (int i = 0 ; i<_nodes.count;i++) {
YKNodeModel *node = _nodes[i];
if ([node.parentID isEqualToString:parentID]) {
if (!self.isPreservation) {
node.expand = NO;
}
insertIndex++;
[_tempNodes insertObject:node atIndex:insertIndex];
[_reloadArray addObject:[NSIndexPath indexPathForRow:insertIndex inSection:0]];//need reload nodes
if (node.isExpand) {
insertIndex = [self expandNodesForParentID:node.childrenID insertIndex:insertIndex];
}
}
}
return insertIndex;
}
demo地址：
https://www.easck.com/p>
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持ASPKU。
注：相关教程知识阅读请移步到IOS开发频道。
