React Native app opens and closes quickly after installation on ios simulator

Question

I've been developing an App using React Native and when I switched to a Mac environment to set up the configurations for ios, after all the setup has been done, the app opens very quickly and closes after the installation, showing that powered by react native screen. I noticed that in my packager screen, the line from the bundle which shows a progress of how much has been loaded does not appear, as if it has never been loaded. Same thing happens if I try to run the code from Xcode.

Here is the screen I'm talking about, for a test project I started for comparisson purposes:

And here is the same screen for my App, without the progress indicator being displayed:

I tried following some solutions provided by the comunity for similar issues but none of them worked. Note that no error message is displayed in my terminal window, as if the build and installation has been succesfull.

Can someone help me with this one? I've been strugling with this App for quite some time, as react native always seems to crash and display error messages for me. Any help would be much appreciated :)

Edit: forgot to mention that I'm trying to run the app on the simulator since I don't have an actual device.

Answer 1

Exactly this problem happened to me yesterday when I too installed react-native-firebase. I ran react-native run-ios and the app closed as soon as it opened without any specific errors.

I decided to run the app from Xcode, so I opened the Xcode project. To be more precise I opened the <Project>.xcworkspace because I installed CocoaPods. And there inside the logs I when trying to run the app I found the error. It said that the GoogleService-Info.plist was not found. And as I was looking through the Xcode workspace I did not see the file there, although it existed under /ios/<Project>/ in my IDE (VSCode). So maybe just a syncing problem.

So basically I added the file in Xcode as well, re-run and app was running fine.

Of course, I have no idea if I can find some sort of credible sources about this, but this exact issue happened to me under the exact same circumstances as yours.

Answer 2

Some solutions ...

• If you are in latest react version then try to downgrade it.
• Re-start your application and try to run again.
• Delete node modules folder and run using npm install.
• Try to open project using XCODE and build through it.
  
  Most probably the problem is with your react version. Try to downgrade to stable react version and try

Answer 3

Check the log for errors, run react-native log-ios on the terminal and monitor it for errors.

or you can enable Debug JS Remotely option from the simulator by pressing command+D and check the console for errors.

Answer 4

Try to use adb logcat *:E, this will be helpful when you trying to find issues not related js.

Answer 5

I depends on the version of your react-native, if you are using its latest version , 0.56.0 (for now) it has a known issue, which you can see here, and it is suppose to be fixed in next version 0.57.0

https://github.com/facebook/react-native/issues/19953

although the issue raised for android version, but it has similar issue in ios (the latest comment, provides more info about the error)

for now the possible fix is to downgrade to 0.55.4 or 0.55.0

if this couldn't solve your issue, Please provide more information about your app with adding package.json and build.gradle info to the question

Answer 6

Add firebase crashlytics or open again and again that app, so it navigates to the log screen to find the issue. Mainly it caused by the misconfigured pod settings. So please check your Podfile. because all the other errors are comes in app's internal error console. I'm attaching the Non error formed Podfile for your reference. It's only the example

Podfile

require_relative '../node_modules/react-native/scripts/react_native_pods'
require_relative '../node_modules/@react-native-community/cli-platform-ios/native_modules' 
platform :ios, '12.0'

target 'iospodapp' do 
  config = use_native_modules!  
  use_react_native!(
    :path => config[:reactNativePath],
    # to enable hermes on iOS, change `false` to `true` and then install pods
    :hermes_enabled => false
  ) 
  permissions_path = '../node_modules/react-native-permissions/ios'
  pod 'Permission-LocationAlways', :path => "#{permissions_path}/LocationAlways.podspec"
  pod 'Permission-LocationWhenInUse', :path => "#{permissions_path}/LocationWhenInUse.podspec"
  pod 'Permission-MediaLibrary', :path => "#{permissions_path}/MediaLibrary.podspec"
  pod 'Permission-Notifications', :path => "#{permissions_path}/Notifications.podspec"
  pod 'Permission-PhotoLibrary', :path => "#{permissions_path}/PhotoLibrary.podspec"

  pod 'YogaKit'  
  pod 'Firebase/Performance'
  pod 'Firebase/Messaging'    
  pod 'RNVectorIcons', :path => '../node_modules/react-native-vector-icons' 
  pod 'react-native-orientation', :path => '../node_modules/react-native-orientation'
  pod 'RNFS', :path => '../node_modules/react-native-fs'

  target 'iospodappTests' do
    inherit! :complete
    # Pods for testing
  end

  # Enables Flipper.
  #
  # Note that if you have use_frameworks! enabled, Flipper will not work and
  # you should disable the next line.
  
  use_flipper!() 

  post_install do |installer|
    flipper_post_install(installer)
    installer.pods_project.targets.each do |target|
      target.build_configurations.each do |config|
        config.build_settings['IPHONEOS_DEPLOYMENT_TARGET'] = '12.0'
       end
    end 
  end
end

Note:

1. If you're using the firebase, don't forget to add the GoogleService-Info.plist into your ios directory through xcode.
2. If you're using firebase analytics that also makes the crash. because it needs too more configurations to avoid the crash. so check your build without firebase analytics first. If everything is fine, you can add the analytics later

Answer 7

If it occurs without any major changes close Terminal, Emulator and any other application related. clean the project clean cache

npm start -- --reset-cache

clean and Install pod file

Cd IOS && podinstall

Rebuild the project.