UISearchController animations issues

Originator:matej
Number:rdar://21682685 Date Originated:06-Jul-2015 02:52 PM
Status:Open Resolved:
Product:iOS Product Version:iOS 9.0b2, iOS 8.4
Classification:UI/Usability Reproducible:Always
 
Summary:

While migrating PSPDFKit to the new UISearchController API, we noticed a few issues with implicit animations. 

On iOS 9b2:
- the search bar placeholder text doesn't animate from center alignment to left alignment the first time search is invoked (works fine afterwards though)
- the table view row deselection on the searchResultsController is abrupt instead of animated (as observable on a regular UITableViewController with clearsSelectionOnViewWillAppear enabled - the default configuration)

On iOS 8, the search bar placeholder animation works, the however the deselection does not occur at all.

Steps to Reproduce:

Extract the attached archive. The animations can be observed in the attached GIF (recorded on iOS 9).
The archive also contains a slightly modified version of the Apple TableSearch example. The only changes made were 1.) adding a launch storyboard for proper display on iPhone 6 and commenting a line that immediately deselected the selected cell (commented with a “//PSPDFKit” prefixed comment). 

Expected Results:

The placeholder text would always animate & the selected row deselection would be animated like usual for UITableViewController. 

Actual Results:

See Summary. 

Regression:

iOS 9.0b2, iOS 8.4, iPhone and iPad.

Comments

Example project

http://cl.ly/2I1N3C2d3I3d

By matej at July 6, 2015, 12:57 p.m. (reply...)

Workaround for the deselection issue

  • (void)viewWillAppear:(BOOL)animated { [super viewWillAppear:animated];

    // Only really needed on iOS 8, due to a UIKit bug, but also makes the deselection animation nicer on iOS 9 UITableView *searchTableView = ((UITableViewController )self.searchController.searchResultsController).tableView; NSIndexPath selectedIndexPath = searchTableView.indexPathForSelectedRow; if (selectedIndexPath != nil) { [searchTableView deselectRowAtIndexPath:selectedIndexPath animated:YES]; } }

By matej at July 6, 2015, 12:57 p.m. (reply...)

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