Merge pull request nek023#158 from IanHoar/ipad_form_sheet_bug

Delay asset controller layout until frame is correct and layout is complete
nebosuke · Mar 1, 2017 · 93ba9d5 · 93ba9d5
2 parents 49b7c6c + 7f79db0
commit 93ba9d5
Showing 1 changed file with 6 additions and 2 deletions.
diff --git a/QBImagePicker/QBAssetsViewController.m b/QBImagePicker/QBAssetsViewController.m
@@ -105,8 +105,12 @@ - (void)viewWillAppear:(BOOL)animated
 
     // Scroll to bottom
     if (self.fetchResult.count > 0 && self.isMovingToParentViewController && !self.disableScrollToBottom) {
-        NSIndexPath *indexPath = [NSIndexPath indexPathForItem:(self.fetchResult.count - 1) inSection:0];
-        [self.collectionView scrollToItemAtIndexPath:indexPath atScrollPosition:UICollectionViewScrollPositionTop animated:NO];
+        // when presenting as a .FormSheet on iPad, the frame is not correct until just after viewWillAppear:
+        // dispatching to the main thread waits one run loop until the frame is update and the layout is complete
+        dispatch_async(dispatch_get_main_queue(), ^{
+            NSIndexPath *indexPath = [NSIndexPath indexPathForItem:(self.fetchResult.count - 1) inSection:0];
+            [self.collectionView scrollToItemAtIndexPath:indexPath atScrollPosition:UICollectionViewScrollPositionTop animated:NO];
+        });
     }
 }