Bug 33376 - Delay In Listening for TouchEvents/Gestures After View is Loaded
Summary: Delay In Listening for TouchEvents/Gestures After View is Loaded
Alias: None
Product: iOS
Classification: Xamarin
Component: General ()
Version: XI 8.10
Hardware: PC Mac OS
: --- normal
Target Milestone: Untriaged
Assignee: Bugzilla
Depends on:
Reported: 2015-08-25 17:59 UTC by Jimmy [MSFT]
Modified: 2017-07-25 13:40 UTC (History)
3 users (show)

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

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Description Jimmy [MSFT] 2015-08-25 17:59:13 UTC
*** Overview ***
There is a delay between a user touching the screen and the app responding when a view is first loaded. The view loads and touch events/ gesture recognizers are not listened for immediately. This makes it possible to try and interact with a control and it will not respond until a second touch is received since the first one was not detected.

*** Steps to Reproduce ***
1. Download and run the Touch sample: http://developer.xamarin.com/guides/cross-platform/application_fundamentals/touch/part_2_ios_touch_walkthrough/Resources/Touch_final.zip

2. Select “Touch Samples” and immediately try to interact with green “Drag Me” image
3. Select "Gesture Recognizer Samples" and again immediately try to interact with green “Drag Me” image

*** Actual Results ***
If you try to interact with the image very quickly, almost as if the view is still transitioning into view, the image will not react to the touch. You need to touch the image again before it will respond.

*** Expected Results ***
The app listens for and receives the touch event as soon as the view is visible.

*** Environment Info ***
Xamarin Studio
Version 5.9.5 (build 10)
Installation UUID: 94ce5106-6a72-4691-b34e-cd5857b1db66
	Mono 4.0.3 ((detached/d6946b4)
	GTK+ 2.24.23 (Raleigh theme)

	Package version: 400030020

Apple Developer Tools
Xcode 6.4 (7720)
Build 6E35b

Version: (Business Edition)
Hash: 2c66d2f
Branch: master
Build date: 2015-08-04 13:52:25-0400

Version: (Business Edition)
Android SDK: /Users/jimmygarrido/Library/Developer/Xamarin/android-sdk-macosx
	Supported Android versions:
		2.3   (API level 10)
		4.0.3 (API level 15)
		4.1   (API level 16)
		4.4   (API level 19)
		5.0   (API level 21)
		5.1   (API level 22)
Java SDK: /usr
java version "1.7.0_79"
Java(TM) SE Runtime Environment (build 1.7.0_79-b15)
Java HotSpot(TM) 64-Bit Server VM (build 24.79-b02, mixed mode)

Xamarin Android Player
Version: Unknown version
Location: /Applications/Xamarin Android Player.app

Version: (Business Edition)

Build Information
Release ID: 509050010
Git revision: 48d16bc4f12ce3938964fc7c3d72fdc6887ad4ad
Build date: 2015-08-18 16:55:24-04
Xamarin addins: c2d51b360ad9f59e689046d47030df27de28f94a

Operating System
Mac OS X 10.10.5
Darwin Jimmys-MacBook-Pro.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 1 Rolf Bjarne Kvinge [MSFT] 2015-09-01 07:07:51 UTC
This doesn't sound like a bug in Xamarin.iOS, but instead either how the sample is written or a bug in Apple's code.

Does the same thing happen with an Xcode project?
Comment 2 John Miller [MSFT] 2017-07-25 13:40:08 UTC
Because we have not received a reply to our request for more information, we are marking this issue as RESOLVED→NORESPONSE. If you are still encountering this issue on the latest Xamarin.iOS, please don’t hesitate to reopen the ticket with the requested information. Thanks!