App crashing suddenly on launch - iPhone enterprise version

Question

I have enterprise version installed on few of the devices. On one of the device app is crashing immediate after the launch button click every time.

It is working on other device without crash. Can any one help me on the issue that why it is crashing ?

**edit: We seems it certificate expiration issue. But if certificate is expired then it also should not work when I install it in new device.

Answer 1

We figured out this but posting bit late.

Few data systems and validation not matched in case of the Date Time system used. Date Time formats are different according to user and devices. Few systems have date formate as a month in the first 3 characters longer than the year(e.g. 1 Aug 2020). (from the same region devices, the date time format could be different). so this validation is very critical and needs to consider and all test cases. This was the issue we were facing as in the start we were opening the calendar and fetching the events accordingly.

Also displaying data on threads and managing threads are also more important in this kind of case. Memory leaks and appropriate GCD usage may also lead to this situation.

Thanks

Answer 2

Here are few steps will help you to find / detect / resolve your issue :

• If its live version which you are testing than check out crash logs.
• To check crash logs open Xcode -> window -> Organiser -> Select your app -> Crashes -> Select current version. You will find the crash open it in Xcode it will help you to find the line which generating crash
• If its not live app than try to debug app on same device using debug ad hoc provisioning
• Another way is you can also use crashlytics tool into your app. It will give you detailed information of the crash along with the possible code which encouraging the crash

Possible reasons for crash :

• Architecture support. Might be crash issue generated only on base 64 devices than check out your app is base 64 supported or not
• Use of Depreciated methods can also cause the crash
• iOS Compatibility issue can also be a reason of crash
• Most important reason is if your app trying to access privacy information without permission alert than also it will get crashed at very beginning of app launch

Hope it will help you.