UITableView category method to smoothly animate in content (cells, headers and footers) after loading data.

UITableView+Animations.m

/*

# Place this method inside a UITableView category.
# Usage:

  [theTableView reloadData];
  [theTableView layoutSubviews];
  [theTableView tbl_animateInVisibleCells];

# If you don't want to use a category, replace 'self' with your tableView.

*/

- (void)tbl_animateInVisibleCells
{
    NSMutableArray* visibleViews = self.visibleCells.mutableCopy;
    
    NSArray* visibleSections = [self.indexPathsForVisibleRows valueForKeyPath:@"@distinctUnionOfObjects.section"];
    
    for (NSNumber* section in visibleSections)
    {
        UIView* headerView = [self headerViewForSection:section.intValue];
        
        if (headerView)
        {
            [visibleViews addObject:headerView];
        }
        
        UIView* footerView = [self footerViewForSection:section.intValue];
        
        if (footerView)
        {
            [visibleViews addObject:footerView];
        }
    }
    
    NSArray* sortedVisibleViews = [visibleViews sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
        
        CGRect frame1 = [obj1 frame];
        CGRect frame2 = [obj2 frame];
        
        if (frame1.origin.y < frame2.origin.y)
        {
            return NSOrderedAscending;
        }
        else if (frame1.origin.y > frame2.origin.y)
        {
            return NSOrderedDescending;
        }
        else
        {
            return NSOrderedSame;
        }
    }];
    
    for (UITableViewCell* cell in sortedVisibleViews)
    {
        cell.alpha = 0;
        
        CGAffineTransform tx = CGAffineTransformIdentity;
        tx = CGAffineTransformTranslate(tx, 0, 25);
        tx = CGAffineTransformScale(tx, 0.95, 0.95);
        cell.transform = tx;
        
        cell.layer.shouldRasterize = YES;
        cell.layer.rasterizationScale = [UIScreen mainScreen].scale;
    }
    
    CGFloat delay = 0;
    
    for (UITableViewCell* cell in sortedVisibleViews)
    {
        [UIView animateWithDuration:0.75
                              delay:delay
             usingSpringWithDamping:0.6
              initialSpringVelocity:0
                            options:0
                         animations:^{
                             
                             cell.alpha = 1;
                             cell.transform = CGAffineTransformIdentity;
                             
                         } completion:^(BOOL finished) {
                             
                             cell.layer.shouldRasterize = NO;
                             
                         }];
        
        delay += 0.025;
    }
}

Updated this to swift5

https://gist.github.com/SaurabhPrajapati/3a8fcf09c5a4db3d33c42ecb65856f67

Amazing! Thank you @SaurabhPrajapati :)