Intelligent table scrolling has been added

If any dropdown expanded cell is not visible when expanding,
library will scroll the table to show it.

Author: vicpenap

VPPDropDown/VPPDropDown.m

@@ -481,14 +481,14 @@ - (void) toggleDropDown {
     [VPPDropDown addNumberOfRows:rowsToAdd forSection:self.indexPath.section inTableView:self.tableView];
     [self updateGlobalIndexPaths];
 
-    NSMutableArray *indexPaths = [NSMutableArray array];
-    for (int i = 1; i <= [_elements count]; i++) {
-        NSIndexPath *ip = [NSIndexPath indexPathForRow:_rootIndexPath.row+i inSection:_rootIndexPath.section];
-        [indexPaths addObject:ip];
-    }
-    
     if (self.usesEntireSection) {
         // we can add or remove the cells as we manage the entire section
+        NSMutableArray *indexPaths = [NSMutableArray array];
+        for (int i = 1; i <= [_elements count]; i++) {
+            NSIndexPath *ip = [NSIndexPath indexPathForRow:_rootIndexPath.row+i inSection:_rootIndexPath.section];
+            [indexPaths addObject:ip];
+        }
+        
         if (_expanded) {
             // table view insert rows
             [_tableView insertRowsAtIndexPaths:indexPaths withRowAnimation:UITableViewRowAnimationFade];
@@ -507,6 +507,17 @@ - (void) toggleDropDown {
         NSIndexSet *indexSet = [NSIndexSet indexSetWithIndex:_rootIndexPath.section];
         [_tableView reloadSections:indexSet withRowAnimation:UITableViewRowAnimationFade];
     }
+    
+    if (_expanded) {
+        // scroll to last cell if needed
+        NSIndexPath *lastRow = [NSIndexPath indexPathForRow:_globalRootIndexPath.row+[_elements count] inSection:_globalRootIndexPath.section];
+        UITableViewCell *lastVisibleCell = [self.tableView.visibleCells lastObject];
+        NSIndexPath *lastVisibleIndexPath = [self.tableView indexPathForCell:lastVisibleCell];
+        // lets scroll if only half of the cells are visible
+        if (lastVisibleIndexPath.section <= lastRow.section && lastVisibleIndexPath.row < lastRow.row) {
+            [self.tableView scrollToRowAtIndexPath:lastRow atScrollPosition:UITableViewScrollPositionBottom animated:YES];
+        }
+    }
 }
 
 

VPPDropDownExample/DropDownExample.m

@@ -58,7 +58,7 @@ - (id)initWithStyle:(UITableViewStyle)style
                                                                 tableView:self.tableView
                                                                 indexPath:[NSIndexPath indexPathForRow:kRowDropDownDisclosure inSection:kSection1] 
                                                                  delegate:self 
-                                                            elementTitles:@"Disclosure 1", @"Disclosure 2", @"Disclosure 3", nil];
+                                                            elementTitles:@"Disclosure 1", @"Disclosure 2", @"Disclosure 3", @"Disclosure 4", @"Disclosure 5", nil];
 
 
         NSMutableArray *elts = [NSMutableArray array];