Learn how to leverage transforming operators in RxSwift, in this tutorial taken from our latest book, RxSwift: Reactive Programming With Swift!
Is there a step needed to get RxSwift working in XCode? I downloaded the starter project, made sure the scheme was RxSwiftPlayground, and hit Build. I get errors
diff: /âŠ/Podfile.lock: No such file or directory
diff: /Manifest.lock: No such file or directory
error: The sandbox is not in sync with the Podfile.lock. Run âpod installâ or update your CocoaPods installation.
Iâm brand new to RxSwift and this was first attempt to do something with it.
Hi @jimg, have you followed the instructions in chapter 1 to do pod install first?
Oh, duh, you wonât have access to that unless you bought the book. Please hang on, I am checking into this. The short answer is to go to the project directory in Terminal and run pod install, but I am seeing about having those instructions added to the tutorial. Thanks
No, Scott. Is Chapter 1 available (havenât bought book yet - wanted to try the examples out to see if this is something I want to learn). I didnât have cocoapods installed, so I did that and then did the pod install. I think I have it now. If Chapter 1 is available, let me know.
Glad youâre good to go now. Re: âif this is something I want to learn,â I can help you with that: Yes! 
I got rid of the pod error messages but now am getting No Such Module RxSwift and an error on import RxSwift line. Also the Pods_RxSwiftPlayground.framework seems to be missing.
As for this tutorial and all projects in the book, they all come with a completed Podfile, but without the dependency files included. We looked into this option, but it didnât make sense to include all the files for RxSwift in every single project for each chapter in the book download.
Before you start working on this tutorial, make sure you have the latest version of CocoaPods installed. You need to do that just once before starting to work on this tutorial or any of the bookâs projects. Usually executing this in Terminal will suffice:
sudo gem install cocoapods
If you want to know more, visit the CocoaPods website.
Then follow these steps:
cd /users/yourname/path/to/starter, replacing the example path with the actual path on your computer.pod install to fetch RxSwift from GitHub and install it in the chapter project..xcworkspace file and launch it. Build the workspace one time in Xcode, and youâre ready to work through the chapter!Iâve updated the tutorial exercise files, starter, challenge, and final. Everything is set up and ready to go now. Sorry for the hassle everyone. Enjoy! 
Thanks, Scott - got it working now.
Scott thanks for great tutorial. After reading it I have a question, I want to take last flatMap value and print it after button press, how can I achieve it? I donât see a way how to extract last value from map sequence âŠ
If I understand your question correctly, if value is an array, just get its last property value. Otherwise, your observable needs to be one that replays, such at a ReplaySubject, BehaviorSubject, or Variable.
Hi. I have the pods installed but I get this error when trying to runâŠ
âThe file âRxSwiftPlaygroundâ couldnât be opened because you donât have permission to view it.â Am I missing a step? Thanks! 
Same issue here, any updates?
Have you done a clean and deleted derived data?
If you right-click on the playground file in Finder, what do you see for Sharing & Permissions?
Yes, Iâve done that but no luck, I was using Xcode 8.3.2, not sure if that makes a difference.
I solved it by manually open the .project file first.
It will ask you
âRxSwiftâ is a project downloaded from the Internet. Are you sure you want to open it?
Then I can build it successfully
Opening the project file for chapter 11 doesnât help.
@zboralski Can you be more specific about the issue youâre encountering?
Did you try these steps?
In case itâs a permission issue, also check out this post.
can you give a example of flatmap marble diagram, i realy canât figure out the flatMap { $0.value * 10 }