#Apple image capture crashing how to#
#Apple image capture crashing code#
#Apple image capture crashing download#

So I have Xcode open here and I'm going to open up the Organizer window and you can see that I've selected the Crashes tab, that's the second tab here and I've selected this chocolate chip app that Kuba and I are working on. So now that we have the lay of the land let's play with it. This is very cool if you haven't seen it before, we'll see that in a bit.ДЄnd in the detailed view of course we show you a fully symbolicated backtrace with the crash point highlighted. On the right, for a given crash point you can see the number of unique devices affected and we group crash logs by similar issue, by similar crash point and we rank them in the source list by the number of unique devices affected.ДЄnd you can page through a sampling of the individual logs down below.ДЄnd when you click on this button you can open the crash log in your project, in the debug navigator and see it alongside your source code. On the left, you can see all of your apps distributed over TestFlight and the App Store and we support all of our platforms including watchOS and app extensions.

#Apple image capture crashing download#

You can download these crash logs using a feature in Xcode called the Crashes Organizer, this is what it looks like a beautiful dark mode.ДЄnd let's take a tour through this UI. I'd like first to talk about how you can access those crash logs from your beta testers on TestFlight and your customers on the App Store. So there are a number of ways to access these crash logs. Now thankfully Xcode takes care of symbolicating crash logs so that what you'll see are those pretty function names, file names and line numbers that you're familiar with. This is a snippet from a unsymbolicated crash log. What's actually written out is a list of binary names and addresses. Now the truth is one a release build of your app crashes the log doesn't actually look this pretty. When you're not attached with the debugger the operating system will capture this backtrace in plaintext and save it out to disk in a human readable crash log. Now sometimes you're not always conveniently attached with the debugger like we are here.

#Apple image capture crashing code#

You can see here how the app was started by the operating system and while we're paused we can see how the main function was called and functions are calling other functions within your app and eventually we get to this point where we hit a point where in your code where the only option is to crash, something has gone wrong.ДЄnd ultimately the debugger receives a signal that this app is about to crash and pauses the app. So stop me if you've seen this before, this is what it looks like in Xcode in the debugger when the debugger is attached to your app and has paused the process just before your app is terminated.ДЄnd let's take a closer look at this backtrace on the left. You may have an API where you assert is a parameter is non nil and that's perfectly all right. Or sometimes it's you, the developer that's trying to prevent a failure.

A Swift array and NSArray will halt your process if you attempt to go outside of your array bounds. Sometimes the programming language you're using is trying to prevent a failure and will trigger a crash. The operating system will preserve the user experience by killing your app if it's taking too long to launch or it's using too much memory. Or sometimes it's the operating system that's enforcing some policy. So what's not allowed? Well, sometimes it's impossible for the CPU to execute code, the CPU won't divide by zero.

So first we should define it, what is a crash? A crash is a sudden termination of your app when it attempts to do something that is not allowed.

#Apple image capture crashing how to#

And then Kuba will show you how to catch threading races early, these threading races lead to crashes, and these crashes are very hard to reproduce. And then he's going to go in depth in how to read a tricky memory issue with a crash log. Then Greg is going to come up and give you some more detail on how to read the content of a crash log. Then I'm going to show you some of the tools that we have to access crash logs when they're occurring in the wild. In particular I'm going to cover the fundamentals of crashes, why do they happen, what do they look like. Today we're going to talk about the tools and techniques that you can use to stay on top of your crashes if they're affecting your users. This is a talk for the rest of us, for those of us who make mistakes. So let me start first by saying if you never write code that crashes this session is not for you.

We have some very cool stuff prepared for you today. I'm going to be joined by some very bright people in a minute. Oh yeah, good morning, thank you for coming.