Bug 8133 - "Quotes" sample application crashes on moving the slider.
Summary: "Quotes" sample application crashes on moving the slider.
Alias: None
Product: iOS
Classification: Xamarin
Component: Samples ()
Version: 6.0.x
Hardware: Macintosh Mac OS
: --- normal
Target Milestone: Untriaged
Assignee: Sebastien Pouliot
Depends on:
Reported: 2012-11-01 08:16 UTC by narayanp
Modified: 2014-01-08 05:47 UTC (History)
7 users (show)

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

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Description narayanp 2012-11-01 08:16:11 UTC
Steps to reproduce:
1. Open the 'Quotes' sample app
2. Debug OR Release the application
3. Click on any page icon
4. Move the slider (min <-> max) few times

Actual result:
On moving the slider, we observe following result:
1. The padding between the lines do not always increase/decrease according to movement of slider.
2. If slider is working properly then at minimum value of slide the text of lines overlap to each other.
3.  On moving the slider (min <-> max) few times, application crashes.

Expected result:
On moving the slider:
1. The padding between the lines should always increase/decrease according to movement of slider.
2. If slider is working properly then at minimum value of slide the text of lines should not overlap to each other.
3. On moving the slider (min <-> max) few times, application should not crash.

iOS Device Log: 

MD Log: 

Crash report: 

Environment info:
All Mac
Mono 2.10.9
MD Stable
monotouch-6.0.4 Stable

Device info:
iPad2 iOS 6.0

Application info:
Comment 1 Jatin 2012-11-22 06:29:38 UTC
An update to the above issue, few more functional issues exists which are as follows:

1. When launch the application, the thumbnail icons of five Shakespeare's play appear, with the rough idea about how the content of the play should appear when click on it's respective thumbnail icon. Below is the screencast for the same: http://www.screencast.com/t/jFELudLN8bq

2. When click on the thumbnail icon of any play, then the UI appears as incorrect, as the text which should appear in brown colour (according to it's thumbnail) is appearing in black colour. Moreover, the slider is not functioning. Here is the screencast for the same: http://www.screencast.com/t/jiLAO5Z0R

And also when the user swipe the finger from Left to Right, the UI gets corrected automatically and the slider also starts functioning properly. However, the user is still not able to scroll the text upward in order to view the complete content on the screen. Below is the screencast for the same: http://www.screencast.com/t/R2VIP19Sx

Below is the build version of MD and MT on which we have tested this:

MT 6.0.8 - 20faf1fe53be8e75d91e3ec6791935cbfe2e0808
MD 3.0.5 Stable
Mono 2.10.9
Comment 2 Peter Collins 2012-11-22 11:40:36 UTC
This is a line by line port of the iOS6 app WWDCQuotes. The functionality described above is working as intended.

This app is intended to demonstrate the difference between old legacy drawing and the new attributed string apis that were added in iOS6. When the user clicks on a thumbnail, the default display should be plain text (black), and an nonfunctional slider. The slider is only enabled in "drawing" mode which is activated by swiping the screen. Swiping the screen also changes certain attributes of certain strings. Scrolling is never enabled. 

The details of this application's functionality are described briefly in the readme.md included in the app.

As for the crash on slider, I will have to attempt a repro next week as I am currently out of town.
Comment 3 Peter Collins 2012-11-26 17:50:43 UTC
I was able to reproduce the slider crash consistently. It seems as if a memory warning is received once or twice while moving the slider back and forth repetitively, and then ultimately the application crashes.
Maybe something isn't being properly disposed or GC'd?

Application Output:

Here are a few more device logs:
Comment 4 GouriKumari 2014-01-07 14:18:21 UTC
The crash is still happenning on moving the slider to and fro in WWDCQuotes.

Test Env:Xamarin Studio
Version 4.3.0 (build 52)
Installation UUID: 5ed3a124-4b77-4c6f-beb9-c830fd815e2a
	Mono 3.2.5 ((no/964e8f0)
	GTK+ 2.24.20 theme: Raleigh
	GTK# (
	Package version: 302050000

Apple Developer Tools
Xcode 5.0.1 (3335.23)
Build 5A2053

Version: (Enterprise Edition)
Hash: eac7b15
Build date: 2013-16-12 16:06:53-0500

Device Info: iPad3 6.0

Supplemental Info:https://gist.github.com/GouriKumari/e599cff4db5cecf23f11
Comment 5 GouriKumari 2014-01-07 14:38:11 UTC
@Sebastien: I am not able to figure out the actual cause of the crash.  It would be helpful if you could look at this sample at some point and give  a few hints.

Test Env:
iPad Air 7.0.3
Comment 6 Rolf Bjarne Kvinge [MSFT] 2014-01-07 18:06:51 UTC

The app was crashing because it was running out of memory (due to a missing call to UIGraphics.EndImageContext).

monotouch-samples/master: ce3a61dd423e4d203c3cecf665250e232687adad
Comment 7 Atin 2014-01-08 05:47:50 UTC
Today, we have checked this issue with:

XS 4.2.3(build 29)
App info: monotouch-samples-master ce3a61dd423e4d203c3cecf665250e232687adad
Device : iPad3 6.1.2

Now application is not crashes when we move the Slider. Hence marking this as Verified