App crash on iOS 15

Question

App crash on iOS 15

Alessandro Anteritano 36

Hi,

Use Visual Studio for Windows Ver. 16.11.1 Preview 1.0 Nuget all updated,

all my apps not working in iOS 15,
at first start it works, if terminate the app and reopen it doesn't work, crash on start

I also tried to make a new project with Visual Studio without any code and it gives the same error.

What could be the problem?

Thanks
Alex

Kyle Wang 5,531 Reputation points Microsoft External Staff

2021-08-18T06:05:32.233+00:00

@Alessandro Anteritano Does this app work normally on other versions of iOS? According to the latest Xamarin.iOS: Xamarin.iOS 14.19 Release Notes, Xamarin.iOS only support for iOS 14.5. So you can report an issue at Github: xamarin/xamarin-macios.
Alessandro Anteritano 36 Reputation points

2021-08-18T08:07:49.8+00:00

Hi,

it works fine on all iOS versions,
if you try a new white project, in Visual Studio, it will only start 1 time on iOS 15, if the app is terminated it will not start anymore,

Is Xamarin not compatible with iOS 15? the final version will be published in a few days and are we not ready yet?
Alessandro Anteritano 36 Reputation points

2021-08-18T10:28:17.447+00:00

I have created a simple example, with the problem

https://github.com/ante1975/test_iOS15

thanks
Brad Germain 96 Reputation points

2021-08-18T12:59:49.653+00:00

I have been experiencing this issue starting later last week as well. I haven't found a solution for it yet, but it could be a bug in the latest iOS beta as well. I tried other apps and some of them crash on first load, but then load fine after so it's definitely not good. I noticed it with Apple's TestFlight app, so not isolated to Xamarin completely. At least TestFlight will load eventually after trying a second time, my Xamarin app crashes everytime.
Alessandro Anteritano 36 Reputation points

2021-08-18T13:17:15.713+00:00

in my opinion it is a global problem, a simple empty project is enough to replicate it, we hope they will solve it soon, otherwise it is serious, Apple did not help me, but the problem must be in iOS 15 , is not possible to have to republish all our apps with iOS 15 !! !

thanks for sharing
Kyle Wang 5,531 Reputation points Microsoft External Staff

2021-08-19T03:46:57.387+00:00

@Alessandro Anteritano If an existing app fails in iOS 15, you can also report it to Apple, as Dell suggested in the thread: can't run the app on iOS 15 Beta 5 after the second time. Existing apps should not fail or need to be rebuilt when the OS is updated.
For applications that want to take advantage of the new iOS 15 features, Microsoft will provide a version of Xamarin for XCode 13 and iOS 15 shortly after Apple releases general availability of XCode 13 and iOS 15. The exact timing depends on how much Apple changes between the final beta and the release version.
Alessandro Anteritano 36 Reputation points

2021-08-19T07:24:29.903+00:00

I have already contacted Apple several times, but they replied to me this:

Apple Developer Technical Support (DTS).
Thank you for contacting Apple Developer Technical Support (DTS).
We’ve determined that your question should be addressed by the support channel for the third-party resource you are using
.
DTS supports developers using Apple-authored tools and frameworks only. We are unable to provide support for third-party tools, development environments, tutorials or other resources.***
msrockswell 6 Reputation points

2021-08-19T07:49:06.22+00:00

We have the same problem. After closing the app, it cannot be restarted. After restarting the phone, the app can be opened once again.
Moni Rivera 1 Reputation point

2021-08-20T04:11:37.41+00:00

Hi, this is happening to my app too. It was working correctly last week but now it crashes on startup.
Omar Rehman 1 Reputation point

2021-08-20T04:39:52.527+00:00

Having the exact same issue with our existing app. App crashes on second launch. If launches fine if it was in the background, but crashes if it was exited and launched again. A device restart lets it run fine again for the first time.

6 answers

Your answer

Kyle Wang 5,531 Reputation points Microsoft External Staff

2021-08-18T06:05:32.233+00:00

@Alessandro Anteritano Does this app work normally on other versions of iOS? According to the latest Xamarin.iOS: Xamarin.iOS 14.19 Release Notes, Xamarin.iOS only support for iOS 14.5. So you can report an issue at Github: xamarin/xamarin-macios.
Alessandro Anteritano 36 Reputation points

2021-08-18T08:07:49.8+00:00

Hi,

it works fine on all iOS versions,
if you try a new white project, in Visual Studio, it will only start 1 time on iOS 15, if the app is terminated it will not start anymore,

Is Xamarin not compatible with iOS 15? the final version will be published in a few days and are we not ready yet?
Alessandro Anteritano 36 Reputation points

2021-08-18T10:28:17.447+00:00

I have created a simple example, with the problem

https://github.com/ante1975/test_iOS15

thanks
Brad Germain 96 Reputation points

2021-08-18T12:59:49.653+00:00

I have been experiencing this issue starting later last week as well. I haven't found a solution for it yet, but it could be a bug in the latest iOS beta as well. I tried other apps and some of them crash on first load, but then load fine after so it's definitely not good. I noticed it with Apple's TestFlight app, so not isolated to Xamarin completely. At least TestFlight will load eventually after trying a second time, my Xamarin app crashes everytime.
Alessandro Anteritano 36 Reputation points

2021-08-18T13:17:15.713+00:00

in my opinion it is a global problem, a simple empty project is enough to replicate it, we hope they will solve it soon, otherwise it is serious, Apple did not help me, but the problem must be in iOS 15 , is not possible to have to republish all our apps with iOS 15 !! !

thanks for sharing
Kyle Wang 5,531 Reputation points Microsoft External Staff

2021-08-19T03:46:57.387+00:00

@Alessandro Anteritano If an existing app fails in iOS 15, you can also report it to Apple, as Dell suggested in the thread: can't run the app on iOS 15 Beta 5 after the second time. Existing apps should not fail or need to be rebuilt when the OS is updated.
For applications that want to take advantage of the new iOS 15 features, Microsoft will provide a version of Xamarin for XCode 13 and iOS 15 shortly after Apple releases general availability of XCode 13 and iOS 15. The exact timing depends on how much Apple changes between the final beta and the release version.
Alessandro Anteritano 36 Reputation points

2021-08-19T07:24:29.903+00:00

I have already contacted Apple several times, but they replied to me this:

Apple Developer Technical Support (DTS).
Thank you for contacting Apple Developer Technical Support (DTS).
We’ve determined that your question should be addressed by the support channel for the third-party resource you are using
.
DTS supports developers using Apple-authored tools and frameworks only. We are unable to provide support for third-party tools, development environments, tutorials or other resources.***
msrockswell 6 Reputation points

2021-08-19T07:49:06.22+00:00

We have the same problem. After closing the app, it cannot be restarted. After restarting the phone, the app can be opened once again.
Moni Rivera 1 Reputation point

2021-08-20T04:11:37.41+00:00

Hi, this is happening to my app too. It was working correctly last week but now it crashes on startup.
Omar Rehman 1 Reputation point

2021-08-20T04:39:52.527+00:00

Having the exact same issue with our existing app. App crashes on second launch. If launches fine if it was in the background, but crashes if it was exited and launched again. A device restart lets it run fine again for the first time.

Answer 1

Alessandro Anteritano 36

Apple fixed the problem in iOS 15 beta 7

Mohammed B 1 Reputation point

2021-08-25T21:33:36.017+00:00

Would you please elaborate on how the app is no longer crashing. Did you need to recompile ? what actions did you take for it to no longer crash ? I have a xamarin app that is still crashing on iOS 15 BETA 7, so I don't see how Apple has fixed this issue.
thank you.
Mohammed B 1 Reputation point

2021-08-25T21:38:58.943+00:00

I have a xamarin iOS app and is still crashing on iOS 15 BETA 7 !
Did you do anything specific to get it to no longer crash ?
I don't see how Apple fixed it.
Alessandro Anteritano 36 Reputation points

2021-08-26T07:19:38.107+00:00

for my apps I do not have to republish them, those on the store, which did not work with iOS 15 beta 6, now all work with beta 7,

I had solved the problem by enabling LLVM (I re-released a test app and everything was ok)

but now with lbeta 7 I don't have to republish again, I recommend if you still have problems to contact Apple directly,

https://developer.apple.com/support/technical/

I worked with them and they solved my problem, I hope they can help you
Mohammed B 1 Reputation point

2021-08-26T15:32:55.49+00:00

@Alessandro Anteritano ,
After enabling LLVM optimizing compiler and setting minimum iOS target to iOS 14.0, it finally launched and works fine with iOS 15 BETA 7.

Thanks you for your guidance.

Answer 2

Erich Brunner | RIS GmbH 6

@Mohammed B You still need to enable LLVM (https://mallibone.com/post/custom-targets-llvm) in your 'AppStore|iPhone' or 'Release|iPhone' Build Configuration , the one where the IPA package ist zipped or a more less workaround set in info.pList the Minimum iOS to 14. But that implicates that you loose clients with iOS below v. 14.x. I still haven't tried to remove the LLVM on iOS 15 Beta 7, but definitely will try it.

Mohammed B 1 Reputation point

2021-08-26T15:30:08.07+00:00

@Erich Brunner | RIS GmbH , enabling LLVM and targeting minimum version of iOS 14.0 made it work with iOS 15 BETA 7.

Thank you for your guidance.

Answer 3

John Hair 371

Setting the deployment target to 14.0 fixes the issue on iOS 15 devices, but excludes all those older iOS versions. That might be an option for some of you though.

Answer 4

Alessandro Anteritano 36

I understood how to solve, enable in Release: "LLVM optimization"

I understand what it is for but I had never used it (by default it is disabled)

does anyone know about related problems?

Another problem with iOS 15 is that it seems to no longer accept whitelisting in
LSApplicationQueriesSchemes (fb / instagram no longer open) but that's another story ...

now i will publish one of my apps and see if everything is ok

Answer 5

Erich Brunner | RIS GmbH 6

@Alessandro Anteritano Enable "LLVM optimization" is the fix for iOS 15 App Crash?

Share via

App crash on iOS 15

6 answers

Your answer