Tableview pulldown to refresh - iphone

Question

Ha ii everybody,i am familiar with pullDownToRefresh in tableview but in want pulluptorefresh in my application like the pocket-sword bible application chapter loading pull-up for next-chapter and pulldown for previous chapter,i done the ordinary pulldown method,but i want pull-up,i tried to customize the existing pulldown code but no luck,i tried more than 4 days for this. i want to implement pull-up below the footer just like the pulldown just-above the header.
anyone have any idea about this please help me.
Kind regards Nipin.
- (void)addPullToRefreshHeader {
refreshHeaderView = [[UIView alloc] initWithFrame:CGRectMake(0, 0 - REFRESH_HEADER_HEIGHT, 320, REFRESH_HEADER_HEIGHT)];
refreshHeaderView.backgroundColor = [UIColor clearColor];
refreshLabel = [[UILabel alloc] initWithFrame:CGRectMake(0, 0, 320, REFRESH_HEADER_HEIGHT)];
refreshLabel.backgroundColor = [UIColor lightGrayColor];
refreshLabel.font = [UIFont boldSystemFontOfSize:16.0];
refreshLabel.textColor = [UIColor whiteColor];
refreshLabel.textAlignment = UITextAlignmentCenter;
refreshArrow = [[UIImageView alloc] initWithImage:[UIImage imageNamed:#"arrow.png"]];
refreshArrow.frame = CGRectMake((REFRESH_HEADER_HEIGHT - 27) / 2,
(REFRESH_HEADER_HEIGHT - 44) / 2,
27, 44);
refreshSpinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleGray];
refreshSpinner.frame = CGRectMake((REFRESH_HEADER_HEIGHT - 20) / 2, (REFRESH_HEADER_HEIGHT - 20) / 2, 20, 20);
refreshSpinner.hidesWhenStopped = YES;
[refreshHeaderView addSubview:refreshLabel];
[refreshHeaderView addSubview:refreshArrow];
[refreshHeaderView addSubview:refreshSpinner];
[self.table addSubview:refreshHeaderView];
}
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
if (isLoading) return;
isDragging = YES;
}
- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
if (isLoading) {
// Update the content inset, good for section headers
if (scrollView.contentOffset.y > 0)
self.table.contentInset = UIEdgeInsetsZero;
else if (scrollView.contentOffset.y >= -REFRESH_HEADER_HEIGHT)
self.table.contentInset = UIEdgeInsetsMake(-scrollView.contentOffset.y, 0, 0, 0);
} else if (isDragging && scrollView.contentOffset.y < 0) {
// Update the arrow direction and label
[UIView beginAnimations:nil context:NULL];
if (scrollView.contentOffset.y < -REFRESH_HEADER_HEIGHT) {
// User is scrolling above the header
refreshLabel.text = #"Release to previous chapter...";
[refreshArrow layer].transform = CATransform3DMakeRotation(M_PI, 0, 0, 1);
} else { // User is scrolling somewhere within the header
refreshLabel.text = #"Pull down to previous chapter..";
[refreshArrow layer].transform = CATransform3DMakeRotation(M_PI * 2, 0, 0, 1);
}
[UIView commitAnimations];
}
}
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {
if (isLoading) return;
isDragging = NO;
if (scrollView.contentOffset.y <= -REFRESH_HEADER_HEIGHT) {
// Released above the header
[self startLoading];
}
}
- (void)startLoading {
isLoading = YES;
delegate.selectedChapter = [NSString stringWithFormat:#"%d",[delegate.selectedChapter intValue] + 1];
[delegate reloadVerses];
[self resetReadViewToVerse:1];
// Show the header
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDuration:0.3];
self.table.contentInset = UIEdgeInsetsMake(REFRESH_HEADER_HEIGHT, 0, 0, 0);
refreshLabel.text = #"Loading...";
refreshArrow.hidden = YES;
[refreshSpinner startAnimating];
[UIView commitAnimations];
// Refresh action!
[self refresh];
}
- (void)stopLoading {
isLoading = NO;
// Hide the header
[UIView beginAnimations:nil context:NULL];
[UIView setAnimationDelegate:self];
[UIView setAnimationDuration:0.3];
[UIView setAnimationDidStopSelector:#selector(stopLoadingComplete:finished:context:)];
self.table.contentInset = UIEdgeInsetsZero;
[refreshArrow layer].transform = CATransform3DMakeRotation(M_PI * 2, 0, 0, 1);
[UIView commitAnimations];
}
- (void)stopLoadingComplete:(NSString *)animationID finished:(NSNumber *)finished context:(void *)context {
// Reset the header
refreshLabel.text =#"Pull down to previous chapter..";
refreshArrow.hidden = NO;
[refreshSpinner stopAnimating];
}
- (void)refresh {
// This is just a demo. Override this method with your custom reload action.
// Don't forget to call stopLoading at the end.
[self performSelector:#selector(stopLoading) withObject:nil afterDelay:2.0];
}

Answer 1

I dont know exactly about your task. But try out following code which identifies the scrollPosition of UITableView :
NSIndexPath* ipath = [NSIndexPath indexPathForRow: cells_count-1 inSection: sections_count-1];
[tableView scrollToRowAtIndexPath: ipath atScrollPosition: UITableViewScrollPositionTop animated: YES]
For more reference go to Link