danielebogo/DBCamera

Inconsistent state

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#173 opened on Jul 30, 2015

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Description

I've been using DBCamera manager for a while. In the latest release I'm getting quite a few of these:

Fatal Exception: NSInternalInconsistencyException
*** -[AVCaptureStillImageOutput captureStillImageAsynchronouslyFromConnection:completionHandler:] - inconsistent state.

stack trace:

ReceiptBank 
DBCameraManager.m line 154
-[DBCameraManager captureImageForDeviceOrientation:]

ReceiptBank 
DBCameraViewController.m line 405
-[DBCameraViewController cameraViewStartRecording]

ReceiptBank 
DBCameraView.m line 352
-[DBCameraView triggerAction:]

I've only replicated it once, the camera shows up black (somehow failed to initialise I guess) and upon pressing the capture button the crash occurs. In the wild the crash is occurring quite a often. I'm not sure what part of my code could cause the camera to show up black randomly. I do dismiss the camera controller when the app goes in the background and recreate a new one when going in foreground if needed.

Contributor guide

Research direction
Inspect the DBCameraManager initialization and capture flow to ensure AVCaptureStillImageOutput is in a proper state before calling captureStillImageAsynchronouslyFromConnection:completionHandler:. Check for missing configuration or premature capture.
Tech stack
objective c
Domain
mobile
Issue type
Bug
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
1-3 hours
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Mostly clear
Prerequisites
Objective CiOS developmentAVFoundation
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
30