Bug 35578 - [tvos] SetNeedsFocusUpdate not setting focus to view
Summary: [tvos] SetNeedsFocusUpdate not setting focus to view
Alias: None
Product: iOS
Classification: Xamarin
Component: Xamarin.TVOS.dll ()
Version: XI 9.3 (xcode 7.1 previews)
Hardware: Macintosh Mac OS
: --- normal
Target Milestone: tvOS
Assignee: Bugzilla
Depends on:
Reported: 2015-11-05 09:37 UTC by Vincent Roggero
Modified: 2015-12-01 15:26 UTC (History)
3 users (show)

Is this bug a regression?: ---
Last known good build:

sample project (53.30 KB, application/zip)
2015-11-06 01:32 UTC, Brad Umbaugh

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Description Vincent Roggero 2015-11-05 09:37:30 UTC
- Run the attached sample project
- ViewDidAppear calls SetNeedsFocusUpdate for button D

- Focus goes to button A

- Focus to be on button D
Comment 1 Vincent Roggero 2015-11-05 09:38:00 UTC
=== Xamarin Studio ===

Version 5.10 (build 988)
Installation UUID: 5df374dd-127a-4b3e-bfa6-0a872d52b886
	Mono 4.0.4 ((detached/d481017)
	GTK+ 2.24.23 (Raleigh theme)

	Package version: 400040004

=== Xamarin.Profiler ===

Not Installed

=== Apple Developer Tools ===

Xcode 7.1 (9079)
Build 7B91b

=== Xamarin.Mac ===

Version: (Starter Edition)

=== Xamarin.iOS ===

Version: (Business Edition)
Hash: efb0d4d
Branch: master
Build date: 2015-10-27 01:36:02-0400

=== Xamarin.Android ===

Version: (Business Edition)
Android SDK: /Users/vincentr/Library/Developer/Xamarin/android-sdk-macosx
	Supported Android versions:
		2.3   (API level 10)
		4.0.3 (API level 15)
		4.4   (API level 19)
		5.0   (API level 21)

SDK Tools Version: 24.1.2
SDK Platform Tools Version: 22.0.0
SDK Build Tools Version: 22.0.1

Java SDK: /usr
java version "1.8.0_45"
Java(TM) SE Runtime Environment (build 1.8.0_45-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.45-b02, mixed mode)

=== Xamarin Android Player ===

Not Installed

=== Build Information ===

Release ID: 510000988
Git revision: e2bb36197f892ea0fd385585a02cf68cf4f03b5f
Build date: 2015-10-26 12:23:51-04
Xamarin addins: b333d5f54ab244893787ad30eee07e43112fe175
Build lane: monodevelop-lion-xcode7.1

=== Operating System ===

Mac OS X 10.10.5
Darwin Vincents-iMac.local 14.5.0 Darwin Kernel Version 14.5.0
    Wed Jul 29 02:26:53 PDT 2015
    root:xnu-2782.40.9~1/RELEASE_X86_64 x86_64
Comment 2 Sebastien Pouliot 2015-11-05 10:50:39 UTC
There's no attachment to the bug report.
Comment 3 Vincent Roggero 2015-11-05 15:35:38 UTC
Attachment is too large. Posted on dropbox;
Comment 4 Brad Umbaugh 2015-11-06 01:32:15 UTC
Created attachment 13699 [details]
sample project

Cleaned bin and obj from Vincent's sample project, uploaded directly
Comment 5 Vincent Roggero 2015-11-06 16:09:28 UTC
Attachment added
Comment 6 Sebastien Pouliot 2015-11-10 09:17:00 UTC
That's fairly new to me but my understanding of [1] is that the update is controlled by `PreferredFocusedView`.

It's also very uncommon, in iOS API, to call a method on a instance that affect it's parent state, e.g.

> btnD.SetNeedsFocusUpdate ();

does not change the `btnD` parent focus (but it's own).

In you sample you should add:

		UIView focus;

		public override UIView PreferredFocusedView
			get {
				return focus;

so you return which UIView you want to focus (null is fine). The when your viewcontroller ViewDidAppear is called set the `focus` to `btnD` and tell the `UIViewController` that an update to the focus is needed.

		public override void ViewDidAppear (bool animated)
			base.ViewDidAppear (animated);

			focus = btnD;
			SetNeedsFocusUpdate ();

[1] https://developer.apple.com/library/prerelease/tvos/documentation/General/Conceptual/AppleTV_PG/WorkingwiththeAppleTVRemote.html
Comment 7 Vincent Roggero 2015-12-01 15:26:51 UTC
This resolved my issue.