@JGoldberger I got back on the Mac, and Debug has an iPhone Simulator option. I'm pretty sure it didn't have that before, but if it did, that wouldn't be the first time I've missed something that's staring me in the face.
- I help a developer who writes iOS apps - he sends me the app to test and to produce the screenshots for both the iTunes store and his website. I just run the app in the iOS Simulator then set the counter, filename and save location, then it's as easy as navigating to the screen I want in the app being tested and clicking a button.
- One of our favorite iOS emulators on the market is App.io. The app is free and it is very easy to use. The interface is so simple that it can be used by almost anyone. The App.io is available on both platforms; you can use it as iOS emulator for Mac and for Windows.
- No doubt about the fact that NDS4iOS is the best Nintendo DS Emulator for iOS devices. It’s most popular with iOS 7 and 8, The New update released for this app Now allow the full use on iOS 9. This emulator works great, especially with Pokemon games. It’s fast, and easy to use.
Starting the simulator#
Once you have your React Native project initialized, you can run
npx react-native run-ios
inside the newly created project directory. If everything is set up correctly, you should see your new app running in the iOS Simulator shortly.Specifying a device#
You can specify the device the simulator should run with the
--simulator
flag, followed by the device name as a string. The default is 'iPhone 11'
. If you wish to run your app on an iPhone SE, run npx react-native run-ios --simulator='iPhone SE'
.Simulate Ios On Mac
The device names correspond to the list of devices available in Xcode. You can check your available devices by running
xcrun simctl list devices
from the console.Multiple iOS simulators simultaneously
The other day I ran into a feature I wanted to test with multiple iOS simulators at the same time. When running your app through Xcode, you can only open one device at a time. I never had this requirement before so I never really dug deeper but I was happy to find out that you can do this quite painlessly. Despite not being able to do this directly out of Xcode, you can just open another simulator by opening up the Terminal and typing the following commands found through a good Stackoverflow thread:
cd /Applications/Xcode.app/Contents/Developer/Applications
open -n Simulator.app
open -n Simulator.app
Now, opening the second (or third) simulator will open with an error “Unable to boot device in current state: Booted”.
![App App](/uploads/1/3/3/9/133943816/146558162.jpg)
All you need to do to get the second simulator to work at this point is to change the device type of one of the simulators by heading to Hardware > Device > Chosen iOS version > and choose any of the other iOS devices or versions in the list. You can run a single version of any simulator you have installed so potentially you can have a whole tribe of simulator instances running at once.
And there we go! You are now running several instances of an iOS simulator. It’s a very useful method if you want to test some online features of your app or if you want to speed up testing on multiple screen sizes.
Other options
There are quite a few developers that have saved these lines into scripts which we recommend you do if you need to run multiple iOS simulators more often.
Quick search also showed that people have tried to tackle this use case with even bigger guns. Facebook has a public repo on their Github account called FBSimulatorControl which promises a “Mac OS X library for managing, booting and interacting with multiple iOS Simulators simultaneously” which sounds very promising if you need more features. For a simple test case I believe opening the simulator from the terminal or through a script is easy enough.
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