Bug 45808 - AVaudioplayer setvolume exception on iOS9 and below
Summary: AVaudioplayer setvolume exception on iOS9 and below
Status: RESOLVED ANSWERED
Alias: None
Product: iOS
Classification: Xamarin
Component: Xamarin.iOS.dll ()
Version: XI 10.0 (iOS10)
Hardware: Macintosh Mac OS
: --- normal
Target Milestone: Future Cycle (TBD)
Assignee: Alex Soto [MSFT]
URL:
Depends on:
Blocks:
 
Reported: 2016-10-22 18:39 UTC by Sander van den Brakel
Modified: 2016-10-23 22:35 UTC (History)
2 users (show)

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

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Status:
RESOLVED ANSWERED

Description Sander van den Brakel 2016-10-22 18:39:45 UTC
iOS 10 introduced the fadeDuration selector to AVAudioplayer.SetVolume.
https://developer.apple.com/reference/avfoundation/avaudioplayer/1643591-setvolume

This works in Xamarin but when compiled om iOS 9 it sends the selector fadeDuration which is not available. Resulting in a "invalid selector send to instance".
Comment 1 Alex Soto [MSFT] 2016-10-23 22:29:11 UTC
Hello!

> This works in Xamarin but when compiled om iOS 9 it sends the selector fadeDuration
> which is not available. Resulting in a "invalid selector send to instance".

This is correct, since the selector is only available on iOS 10 and you should be using it only if you are running iOS 10, you can conditionally use API based on the iOS version you are running as documented here https://developer.xamarin.com/recipes/ios/general/projects/environment_checks/#Check_the_iOS_Version

Also you might want to try to set the Volume property instead of using the SetVolume method if iOS < 10

https://github.com/xamarin/xamarin-macios/blob/d0773a9ffccd964dbff6c623ae769470cec6750d/src/avfoundation.cs#L1153-L1158

Hope this helps.
Comment 2 Sander van den Brakel 2016-10-23 22:35:01 UTC
Ah great thanks.

I missed the volume option for iOS 9 and below.

My bad.