升级到 Xcode 10 后找不到 iPhone 6 模拟器

Question

I updated to Xcode 10 and since I did that, I can't run the simulator in terminal with the command react-native run-ios . I get this error:

Could not find iPhone 6 simulator

When I go to Xcode > Window > Devices and Simulator the simulator is there and when I do xcrun simctl list devices I also see the list of simulator.

I can run the app on my phone with react-native run-ios --device and from Xcode, and I tried with multiple apps so it's not the app.

When I go to Xcode > Preferences > Locations, Xcode 10.0 (10A255) is selected at Command Line Tools.

I tried restarting the computer, as well as deleting and re-installing Xcode.

Any ideas what it could be?

Here is my setup:

• MacOs High Sierra 10.13.6
• Xcode Version 10.0
• react-native-cli: 2.0.1
• react-native: 0.57.1

Answer 1

I went to node_modules/react-native/local-cli/runIOS/findMatchingSimulator.js

And i've replaced:

if (version.indexOf('iOS') !== 0 )

with

if (!version.includes("iOS" ))

And

if (simulator.availability !== '(available)')

with

if (simulator.isAvailable !== true)

Answer 2

I had similar issue. React Native - 0.52.3, XCode - 10.2 beta 2

function findMatchingSimulator(simulators, simulatorName) {
  if (!simulators.devices) {
    return null;
  }
  const devices = simulators.devices;
  var match;
  for (let version in devices) {
    // Making sure the version of the simulator is an iOS (Removes Apple Watch, etc)
    if (!version.includes('iOS')) {
      continue;
    }
    [...]
  }
}

• Open file: node_modules/react-native/local-cli/runIOS/findMatchingSimulator.js

• Check if your device version is correct, eg: in line 29 console.log(version)

• Compare it with condition in line 30: if (version.indexOf('iOS') !== 0) {

I had versions list like this:

com.apple.CoreSimulator.SimRuntime.watchOS-5-0 -1
com.apple.CoreSimulator.SimRuntime.tvOS-12-1 -1
com.apple.CoreSimulator.SimRuntime.tvOS-12-2 -1

Any of my versions doesn't return true in this condition... If you have it

• Replace version.indexOf('iOS') !== 0 with !version.includes('iOS') and it solve this issue for me.

Answer 3

The bug has been fixed in react-native so you can update the package in the package.json:

npm install -g npm-check-updates
ncu -u react-native
npm install

Answer 4

Found something that resolved my problem.
You need to go in local-cli/runIOS/findMatchingSimulator.js in react-native node module and change line 37 for

if (
        simulator.availability !== '(available)' &&
        simulator.isAvailable !== 'YES'
) {`

More info on the solution and the problem on react-native github :
https://github.com/facebook/react-native/commit/1031872
https://github.com/facebook/react-native/issues/21571

Answer 5

I just want to share with you guys how I fixed it, maybe it can help someone.

Edit this file: node_modules/react-native/local-cli/runIOS/findMatchingSimulator.js

Change:

if (!version.startsWith('iOS') && !version.startsWith('tvOS')) {
  continue;
}

To:

if (!version.startsWith('com.apple.CoreSimulator.SimRuntime.iOS') 
    && !version.startsWith('com.apple.CoreSimulator.SimRuntime.tvOS')) {
  continue;
}

It worked for me.

I used console.log(version) to see what I got from the variable version and the value wasn't expected as it should be.

Answer 6

it can be solved to fix the file below.

/node_modules/react-native/local-cli/runIOS/findMatchingSimulator.js

replace this line

if (!version.startsWith('iOS') && !version.startsWith('tvOS')) {

with

if (!version.includes('iOS') && !version.includes('tvOS')) {

Answer 7

Using react-native version 0.55.3 with XCode 10 I had to do two changes to get react-native run-ios running.

Inside node_modules/react-native/local-cli/runIOS/findMatchingSimulator.js :

1. The change as described by @martin-leroux :

   Change

   // Skipping non-available simulator if (simulator.availability !== true) {

   to

   // Skipping non-available simulator if ( simulator.availability !== '(available)' && simulator.isAvailable !== 'YES' ) {`

2. Change the line mentioned by @samernady :

   Change

   // Making sure the version of the simulator is an iOS or tvOS (Removes Apple Watch, etc) if (!version.startsWith('iOS') && !version.startsWith('tvOS')) {

   to

   // Making sure the version of the simulator is an iOS or tvOS (Removes Apple Watch, etc) if (!version.includes('iOS') && !version.startsWith('tvOS')) {

Answer 8

I have a self-refactored version of findMatchingSimulator.js. If someone in the future still facing this issue and the solutions mentioned above couldn't solve your problem, just overwrite the findMatchingSimulator-Method in ...node_modules/react-native/local-cli/runIOS/findMatchingSimulator.js with following code:

   function findMatchingSimulator(simulators, simulatorName) {
      if (!simulators.devices) {
        return null;
      }
      const devices = simulators.devices;
      var match = null;
      for(let version in devices){
          //Skip WatchOS
          if(!version.includes("tvOS") && !version.includes("iOS")){
              continue;
          }

          for(let d in devices[version]){
              var currentDevice = devices[version][d];
              if(!currentDevice.isAvailable){
                  continue;
              }
              if(currentDevice.state === "Booted" ){
                  let booted = currentDevice.state === "Booted";
                  if(currentDevice.name === simulatorName ){
                      return {
                              udid: currentDevice.udid,
                              name: currentDevice.name,
                              booted,
                              version,
                      };
                  }else if(!match){
                      //keep track of first available & bootable device
                      match = {
                         udid: currentDevice.udid,
                         name: currentDevice.name,
                         booted,
                         version,
                      };
                  }
              }
          }
      }
      if (match) {
        return match;
      }
      return null;
    }
   }

EDIT: This code will choose an already opened simulator and you're still good to go with the --simulator="NAME" parameter.

Answer 9

one option which worked for me

Check list of simulators installed in your mac using

xcrun simctl list --json devices

on list of simulator, choose any simulator name and run like this

react-native run-ios --simulator 'iPhone 6s'

Hope this works for you

Answer 10

转到 node_modules/react-native/local-cli/runIOS/ 并在 findMatchingSimulator.js 中将第 30 行替换为

if (version.indexOf('com.apple.CoreSimulator.SimRuntime.iOS') !== 0) {

Answer 11

xcrun simctl list --json devices

Edit node_modules/react-native/local-cli/runIOS/findMatchingSimulator.js yourself. Ensure that the findMatchingSimulator function returns an match object like

{
    udid: simulator.udid,
    name: simulator.name,
    version
}

Answer 12

我必须做的是：

 npm install -g npm

Answer 13

remove these lines from package.json "react": "XXXXXXXX", "react-native": "YYYYYYYYY",

then run npm install --save react-native react