在TableView（iOS）中将索引路径移动一

Question

我有一个聊天应用程序，我希望在新聊天数据到来时将索引路径增加一个。但它并没有通过我的代码发生我正在与屏幕截图共享代码请帮助。

NSUInteger messageCount = [self numberOfMessages];

if (self.conversation && messageCount > 0) {
    NSLog(@"%ld",(long)indexPathValue.row);
    NSIndexPath* ip = [NSIndexPath indexPathForRow:indexPathValue.row + 1 inSection:0];
    NSLog(@"%ld",(long)ip.row);
    [layerChatTableView scrollToRowAtIndexPath:ip atScrollPosition:UITableViewScrollPositionTop animated:YES];
}

Answer 1

下面的代码允许你使用底部的滚动位置去最后一个索引路径。

[tableView scrollToRowAtIndexPath:[NSIndexPath indexPathForRow:messageCoutnt-1 inSection:0] atScrollPosition:UITableViewScrollPositionButtom animated:NO];

试着让我知道

Answer 2

I am assuming that you have handled the datasource updating part and that you are updating the table view on main thread. You can try to add new row at bottom like this:

NSInteger section = 0;
NSInteger newCount = [self tableView:self.tableView numberOfRowsInSection:section];
NSMutableArray *paths = @[].mutableCopy;
[paths addObject:[NSIndexPath indexPathForRow:newCount inSection:section]];
[self.tableView beginUpdates];
[self.tableView insertRowsAtIndexPaths:paths withRowAnimation:UITableViewRowAnimationNone];
[self.tableView endUpdates];

You can also add more than 1 row with some modifications.

Hope this helps.