How to Start UITableView on the Last Cell?
iphone, objective-c, uitableview
Solution
`scrollToRowAtIndexPath` should work.
In `viewWillAppear:`, try this:
[theTableView reloadData];
NSIndexPath* ip = [NSIndexPath indexPathForRow:rowNumberHere inSection:sectionNumberHere];
[theTableView scrollToRowAtIndexPath:ip atScrollPosition:UITableViewScrollPositionTop animated:NO];
`rowNumberHere` is the row number in the data source you want to scroll to.
`atScrollPosition` is just one of the values in the `UITableViewScrollPosition` enum which can determine where on the screen the row number you want will show up. However, depending on the number of rows and which row you are scrolling to, it may not make a difference.
Putting `reloadData:` avoids an exception if the data is not loaded yet in `viewWillAppear:`. If you put the `scrollToRowAtIndexPath` in `viewDidAppear:`, you would not need the `reloadData:` but you will see the table jump a little which you say you don't want.
Edit: @Theory, try changing your code as follows...
[tableView reloadData];
int lastRowNumber = [tableView numberOfRowsInSection:0] - 1;
NSIndexPath* ip = [NSIndexPath indexPathForRow:lastRowNumber inSection:0];
[tableView scrollToRowAtIndexPath:ip atScrollPosition:UITableViewScrollPositionTop animated:NO];
Please note `numberOfRowsInSection` returns row count, not the last row number (which is row count - 1).
Problem
In Apple's Messages app, when you click a correspondent's name and switch to the table view of the conversation (with balloons for each message), the table appears scrolled all the way to the end. No animation or anything, it's just there. Similarly, in Tweetie 2, when you load the tweets view, it appears right where you last looked at it. No animation to get there, it's just there, as if none of the cells above were loaded. How do these apps do this? Are they calling `scrollToRowAtIndexPath:atScrollPosition:animated:` somewhere in the table controller? If so, how do they know what to pass to `atScrollPosition:`? And in what method is it called?