Programmatically force a UIScrollView to stop scrolling, for sharing a table view with multiple data sources

Question

I have a UITableView whose data source and delegate are switched between a couple of custom data source objects when the user touches a segmented control (think \"Top Paid\"

Answer 1

It was my problem when I had a UISwitch as selector for the tables. But with the segmented control I haven't any problem. Maybe you didn't reload the table? This is my piece of working code:

NSIndexPath *exPath = [[subTable indexPathsForVisibleRows] lastObject]; 

isMatchOn = [whatList selectedSegmentIndex] == 0 ? YES : NO;  //table source will make the choice looking at this BOOL  

[subTable reloadData];  // here tables actually flip

if (lastPosition) {
    [subTable scrollToRowAtIndexPath:lastPosition atScrollPosition:UITableViewScrollPositionBottom animated:NO];   //I scroll to saved index
    }
self.lastPosition = exPath;  //here I save the current position

Answer 2

Did you try these 2 methods?

They actually apply to the "scrolling" not just the offset of the content.

[self.tableView  scrollToRowAtIndexPath:savedIndexPath atScrollPosition:UITableViewScrollPositionTop animated:NO];

OR:

[self.tableView  scrollRectToVisible:savedFrame animated:NO];

They should actually effect the scrolling and by extension the acceleration of the table, not just what is visible on screen.

Answer 3

You could wait for the 'decelerating' property to become NO (e.g. by using KVO) and switch after that.

Answer 4

Have you tried using [view setContentOffset: offset animated: YES]?

Answer 5

This worked nicely for me:

if (self.tableView.isDecelerating) {
        NSArray *paths = [self.tableView indexPathsForVisibleRows];
        [self.tableView scrollToRowAtIndexPath:[paths objectAtIndex:0] atScrollPosition:UITableViewScrollPositionTop animated:NO];

    }

Answer 6

You could try doing

tableView.scrollEnabled = NO;
tableView.scrollEnabled = YES;

This might stop the scroll by disabling it, then allow it again. I haven't tried this specifically, but I've done similar things.