how to analyse crash report

Question

i need to collect crash reports, but i don't understand them. For testing purposes i make the app crash with just these 2 lines in a viewDidLoad():

var test:String?
test!.isEmpty

now, while debugging the console gives me a helpful output:

2022-04-29 11:31:34.837188+0200 My App[9270:4377453] My_App/WelcomeViewController.swift:26: Fatal error: Unexpectedly found nil while unwrapping an Optional value

i also find a new ips-file in my devices analytics sections of the settings, but i don't see a similar error message anywhere in that file. How can i find out why the app crashed from that file?

Answer 1

Lets split the error message into parts:

2022-04-29 11:31:34.837188+0200

This is the timestamp. When the crash occurred

My_App/WelcomeViewController.swift:26

This is location of the crash in source code. WelcomeViewController.swift file, line 26

found nil while unwrapping an Optional value

Why the crash occurred. Looks like there is an optional data type in your code which you tried to force unwrap (maybe using !). This would have worked if the value of the variable was not nil but it crashed because it was.

Hope this helps. If you need more info please post source code around the file and line mentioned above.