Codesign error with Flutter on iOS

Question

So I have been trying to get into Flutter recently and I am having issues. When I create a new project and do flutter run it works just fine. If I completely close the application and re-run the app I get this error every time.

Failed to build iOS app
Error output from Xcode build:
↳
    ** BUILD FAILED **

Xcode's output:
↳
    === BUILD TARGET Runner OF PROJECT Runner WITH CONFIGURATION Debug ===
    /Users/zachstarnes/Documents/code/test_proj/build/ios/Debug-iphonesimulator/Runner.app: resource fork, Finder information, or similar detritus not allowed
    Command /usr/bin/codesign failed with exit code 1
Could not build the application for the simulator.
Error launching application on iPhone X.

I have no idea how to fix this. I tried opening the xcode project file and signing the project to my organization and rerun but that still does not change the outcome. Any ideas of what I need to do to fix this?

Answer 1

I had this problem and this is what worked for me.

First off, let's just state the obvious, XCode was written to be the IDE version of the Tardis or maybe the Luggage from Terry Pratchett's Discworld series. It's bigger on the inside than it is on the outside and every time you open it you'll be shown something different.

Now, the root problem for me was that my Apple Developer sign in for my project needed to be refreshed. This is how I did that:

1. Open your Flutter project in XCode.
2. On top of the left panel there are some icons. One of them looks like a folder. If you hover over it, it will say "Show the Project navigator". Click that.
3. On left panel below those icons select Runner (should be at the top of a list). This will populate the center panel.
4. In the center panel, along the left-hand side, you should see a column with Project/Runner and Target/Runner. Select the Runner under Target. This will change the contents in the center panel right-hand side.
5. Across the top you should now see the following options: General, Signing & Capabilities, Resource Tags, Info, Build Settings, Build Phases, and Build Rules. Select Signing & Capabilities.
6. If you had the same problem as I had, you will now see prompt in the middle panel section asking you to sign in again and there will be a sign in button right there in the middle of the panel. Click it, sign in with your Apple Developer password.
7. Now build your project again. You may be prompted by macos to login to grant keychain permissions during the build.

Hopefully this will help some other people.

Answer 2

I have the exact same issue. I've tried multiple IDEs, messing with certificates in Xcode, even reinstalling my operating system (since other people that I work with in the same repository have no issues of this kind).

flutter clean

works for me, but only as a temporary fix.

Answer 3

For sure flutter clean helps, however, in my case, it was all about setting the Deployment Target to 9.0

Remember to also enable (uncomment or add) this line platform :ios, '9.0' at the top of your ios/Podfile file as long as you don't care about iOS versions below 9.0

Answer 4

So after a long time if finally figured out how to fix it.

The way I was able to fix is to delete the build directory in the root of your flutter project. The folder just gets rebuilt without the files causing the problem.

I assume it has something to do with forking the fonts/images I was adding to the project.

Edit (6/4/2019) You can also use flutter clean and it will also solve the issue. Stated by @Luke Stanyer below!

Answer 5

There can be multiple reasons for this codesign failure.

Go to Keychain Access -> Apple Worldwide Developer Relations Certificate Authority certificate -> Get Info -> (expand) Trust settings

Then for the combo box for "When using this certificate:" make it System Defaults

Answer 6

Run

 flutter clean

in your command line.