react-native cli cannot start iPhone simulator [Xcode 8]

[julienvincent]

After updating my Xcode version 8 [GM], running react-native run-ios fails to start iPhone simulator (No errors, just nothing happens).

The terminal output is the same as always:

Found Xcode project <project>.xcodeproj
Launching iPhone 6 (10.0)...
Building using "xcodebuild -project <project>.xcodeproj -scheme <project> -destination id=05675D07-A893-4731-9606-1290FF7C1C9F -derivedDataPath build"
User defaults from command line:
    IDEDerivedDataPathOverride = <project>/ios/build

=== BUILD TARGET RCTVibration OF PROJECT RCTVibration WITH CONFIGURATION Debug ===

[chrise86]

Mine won't start either, but I am getting:

The following build commands failed:
    CompileC /Users/chrisedwards/Apps/ReactNative/MyApp/ios/build/Build/Intermediates/Pods.build/Debug-iphonesimulator/React.build/Objects-normal/x86_64/Layout.o /Users/chrisedwards/Apps/ReactNative/MyApp/node_modules/react-native/React/Layout/Layout.c normal x86_64 c com.apple.compilers.llvm.clang.1_0.compiler
(1 failure)

[miguelc1221]

I fixed it by opening up Xcode after updating it. When you open up Xcode, it will ask you to install some missing components, after you install them, you can then run react-native run-ios and it should work fine.

[julienvincent]

I'm still unable to run-ios even after Xcode installed its missing components.

[chrise86]

Same, I notice this amongst all the fuzz:

lang: error: no such file or directory: '/Users/chrisedwards/Apps/ReactNative/MyApp/node_modules/react-native/React/Layout/Layout.c'
clang: error: no input files

and then right at the end:

The following build commands failed:
    CompileC /Users/chrisedwards/Apps/ReactNative/MyApp/ios/build/Build/Intermediates/Pods.build/Debug-iphonesimulator/React.build/Objects-normal/x86_64/Layout.o /Users/chrisedwards/Apps/ReactNative/MyApp/node_modules/react-native/React/Layout/Layout.c normal x86_64 c com.apple.compilers.llvm.clang.1_0.compiler
(1 failure)

[julienvincent]

@chrise86 We have different problems, I do not get compile issues - the only problem is my sim not starting. I suggest you open a new issue with your stack traces.

[julienvincent]

I have solved the problem by following the steps listed in this stackoverflow answer

To summarise - I deleted all configured simulators from the Simulator devices menu, restarted and then re-added the relevant simulators. After doing this, $ react-native run-ios could successfully launch a sim

[sahibhussain]

if nothing works you may have to add simulator yourself by simple steps

1. click on the list of simulators (which would be empty with only 1 option i.e. generic iOS Device)
2. click on add additional simulator
3. in bottom left corner click on plus and select add simulator.
4. simply select the simulator you want.