what should I do if I want to see the tablview from the last

Question

hey I want to make a demo of chat.so when I open UITableView for it, it should display from the last and previous item should be in upper side.. i.e., I want to scroll my UITableView to the last row automatically when user opens the chat screen. what should i do?

my code is-

cell = [tv dequeueReusableCellWithIdentifier:@"Cell"];
if (cell == nil)
{
    cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero reuseIdentifier:nil] autorelease];
}

    [lblName setFont:[UIFont fontWithName:@"Arial" size:12]];
    lblName.lineBreakMode = NSLineBreakByWordWrapping;
    lblName.numberOfLines = 0;
    lblName.text=[arrUsername objectAtIndex:indexPath.row];
    lblName.textColor = [UIColor blackColor];
    [lblName setBackgroundColor:[UIColor grayColor]];
    if ([[arrCommentUid objectAtIndex:indexPath.row] isEqualToString:@"1"]) {
        [lblName setTextAlignment:NSTextAlignmentLeft];
    }
    else

please help!! its the code for just optional.cell of UITableView

score 3 · Accepted Answer · answered Jul 08 '13 at 05:24

try this for chat application

SSMessagesviewcontroller
stbubbletableviewcell
bubblethingie
uibubbletableview
styledchat
acanichat

and also you can go to last row using

   [tableView reloadData];
   int lastRowNumber = [tableView numberOfRowsInSection:0] - 1;
   NSIndexPath* ip = [NSIndexPath indexPathForRow:lastRowNumber inSection:0];
   [tableView scrollToRowAtIndexPath:ip atScrollPosition:UITableViewScrollPositionTop animated:NO];

score 0 · Answer 2 · answered Jul 08 '13 at 05:17

In order to do this, you should sort your array in descending order.Thus it will display your data from last to first.

For that you can use NSSortDescriptor

NSSortDescriptor* sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:nil ascending:NO selector:@selector(localizedCompare:)];
NSArray* sortedArray = [<YOURS_ARRAY> sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];

Enjoy Programming !

Rajneesh071 · Answer 3 · 2013-07-08T07:09:34.953

-1

You can scroll to last using scrollToRowAtIndexPath

[tableView scrollToRowAtIndexPath:lastIndexPath atScrollPosition:UITableViewScrollPositionBottom animated:YES];

And you can get indexPath of last row using

NSIndexPath *lastIndexPath = [NSIndexPath indexPathForRow:([yourTableAry count] - 1) inSection:0];

Or

NSIndexPath *lastIndexPath = [NSIndexPath indexPathForRow:([tableView numberOfRowsInSection:0] - 1) inSection:0];

EDIT

If you want to goto top of row then

NSIndexPath *firstRowIndexPath = [NSIndexPath indexPathForRow:0 inSection:0];

[tableView scrollToRowAtIndexPath:firstRowIndexPath atScrollPosition:UITableViewScrollPositionBottom animated:YES];

edited Jul 08 '13 at 07:09

answered Jul 08 '13 at 05:26

Rajneesh071

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where i write this code? – Jeet Jul 08 '13 at 05:37
but after usinf this code i cant go upside..what i do? – Jeet Jul 08 '13 at 05:46
you can scroll upside dear.. or you can get lower indexPath and use this code again – Rajneesh071 Jul 08 '13 at 06:09
can you give me code? please. i am new in iOS – Jeet Jul 08 '13 at 07:05
check my answer again to go to top buddy – Rajneesh071 Jul 08 '13 at 07:09
i want both downside in starting and can check also upside as need..What will be the condition i write? – Jeet Jul 08 '13 at 07:37
sir basically problem is that at first time it will go to downside perfectly but i m not going to upper side..what should i do? – Jeet Jul 08 '13 at 07:51
how you want to go upside? any button click? – Rajneesh071 Jul 08 '13 at 07:53
so just scroll up your tableview – Rajneesh071 Jul 08 '13 at 10:04
it not work scroll,is any code to scroll? – Jeet Jul 08 '13 at 10:10
where are you putting scrollToRowAtIndexPath ? – Rajneesh071 Jul 08 '13 at 10:17
in mid of cellforrowat inderpath – Jeet Jul 08 '13 at 10:29
put this line where you are getting your new message.., because whenever you scroll your table , your cellforrow will call, and it will again redirect you to bottom – Rajneesh071 Jul 08 '13 at 11:06
ok..thankyou so much for the help ..its work now. – Jeet Jul 08 '13 at 11:10
but i want in starting it will goes to the down(last to up) – Jeet Jul 08 '13 at 11:11
ok make one condition in your cellforrow, that indexPath.row==[yourAry count] then put scrollToRowAtIndexPath:lastIndexPath – Rajneesh071 Jul 08 '13 at 11:20
ok thanks Rajneesh for the help. – Jeet Jul 09 '13 at 06:07
your welcome.. @user2522863(make your own name :)) – Rajneesh071 Jul 09 '13 at 07:05
hey Rajneesh ..its not work. – Jeet Jul 10 '13 at 05:20
`if (indexPath.row==[arrcomment count]) { NSIndexPath *lastIndexPath = [NSIndexPath indexPathForRow:([tblview numberOfRowsInSection:0] - 1) inSection:0]; [tblview scrollToRowAtIndexPath:lastIndexPath atScrollPosition:UITableViewScrollPositionBottom animated:YES]; } ` – Jeet Jul 10 '13 at 05:20
sry rajneesh..its work perfectly..u r rock buddy:) – Jeet Jul 10 '13 at 05:37
thanks @Jeet :) you can accept answer and upvote it too – Rajneesh071 Jul 10 '13 at 07:09

what should I do if I want to see the tablview from the last

3 Answers3