# RxSwift **URL:** https://forums.kodeco.com/c/books/rxswift/30.md [Latest](https://forums.kodeco.com/latest.md) · [Categories](https://forums.kodeco.com/categories.md) · [Tags](https://forums.kodeco.com/tags.md) --- ## [About the RxSwift category](https://forums.kodeco.com/t/about-the-rxswift-category/27817)
**Author:** [@crispy8888](https://forums.kodeco.com/u/crispy8888)\ **Replies:** 7\ **Last updated:** [March 27, 2019, 9:13am UTC](https://forums.kodeco.com/t/about-the-rxswift-category/27817 "2019-03-27T09:13:30Z")
This is for anything and everything related to the print or PDF versions of RxSwift: Reactive Programming with Swift. --- ## [2025 - Playgrounds support](https://forums.kodeco.com/t/2025-playgrounds-support/213415)
**Author:** [@gprasant](https://forums.kodeco.com/u/gprasant)\ **Replies:** 1\ **Last updated:** [September 28, 2025, 6:45am UTC](https://forums.kodeco.com/t/2025-playgrounds-support/213415 "2025-09-28T06:45:42Z")
Hello, I picked up this book in 2025 and I’m trying to run with Xcode 16.4. I’m facing several issues as noted by other questions in this forum on the topic. examples: error: Couldn’t look up symbols: RxSwiftPlaygrou… --- ## [Chapter 2: Observables project problems](https://forums.kodeco.com/t/chapter-2-observables-project-problems/27877)
**Author:** [@faabalia](https://forums.kodeco.com/u/faabalia)\ **Replies:** 40\ **Last updated:** [January 14, 2025, 6:03am UTC](https://forums.kodeco.com/t/chapter-2-observables-project-problems/27877 "2025-01-14T06:03:10Z")
Hi, I had problems with the project, first I could not build without doing “pod install”, and it only works with Xcode 8.1 , I have tried with the last version of XCode (8.3) and it does not work, I can’t build the pro… --- ## [Error when running on chapter 2](https://forums.kodeco.com/t/error-when-running-on-chapter-2/198899)
**Author:** [@mobilifedev](https://forums.kodeco.com/u/mobilifedev)\ **Replies:** 0\ **Last updated:** [November 6, 2023, 5:10am UTC](https://forums.kodeco.com/t/error-when-running-on-chapter-2/198899 "2023-11-06T05:10:24Z")
Xcode15 error: error while processing module import: error: /Users/auttawutsriprasan/Library/Developer/Xcode/DerivedData/RxSwiftPlayground-ajjmssfmknjeruchscflqicixqsr/Build/Intermediates.noindex/Playgrounds/Products/De… --- ## [Brackets for notes in source](https://forums.kodeco.com/t/brackets-for-notes-in-source/183895)
**Author:** [@softways](https://forums.kodeco.com/u/softways)\ **Replies:** 0\ **Last updated:** [February 13, 2023, 12:22am UTC](https://forums.kodeco.com/t/brackets-for-notes-in-source/183895 "2023-02-13T00:22:01Z")
I just lost 15 mins of my life trying to figure out how RxSwift redefines \[ \] because of this line in the First Edition: \[existing code: .subscribe(onDisposed: .. \] Or was that some objective C not properly converted i… --- ## [No such module as RxRelay / Chapter 3](https://forums.kodeco.com/t/no-such-module-as-rxrelay-chapter-3/177529)
**Author:** [@saitowag](https://forums.kodeco.com/u/saitowag)\ **Replies:** 3\ **Last updated:** [January 5, 2023, 9:26am UTC](https://forums.kodeco.com/t/no-such-module-as-rxrelay-chapter-3/177529 "2023-01-05T09:26:04Z")
Hi, I keep getting this error in Chapter 3 Playground. I have tried the solution given in the Forum already but nothing is wokring Please help me out here. --- ## [Chapter 10 API Error](https://forums.kodeco.com/t/chapter-10-api-error/181184)
**Author:** [@lmw41](https://forums.kodeco.com/u/lmw41)\ **Replies:** 1\ **Last updated:** [December 25, 2022, 5:30am UTC](https://forums.kodeco.com/t/chapter-10-api-error/181184 "2022-12-25T05:30:11Z")
The endpoint is not working https://eonet.sci.gsfc.nasa.gov/docs/v2.1 Even though I change endpoint to https://eonet.gsfc.nasa.gov/api/v3 I still have problem in this part return URLSession.shared.rx.response(reques… --- ## [Chapter 24 Build Error with Realm](https://forums.kodeco.com/t/chapter-24-build-error-with-realm/181653)
**Author:** [@lmw41](https://forums.kodeco.com/u/lmw41)\ **Replies:** 0\ **Last updated:** [December 13, 2022, 4:15pm UTC](https://forums.kodeco.com/t/chapter-24-build-error-with-realm/181653 "2022-12-13T16:15:35Z")
The error message is as below: error build: In /Users/david/Documents/Learning/Raywenderlich/FRP/RxSwift\_Reactive\_Programming\_with\_Swift\_v4.0.0/rxs-materials/24-mvvm-with-rxswift/projects/starter/Tweetie/Pods/Realm/core… --- ## [Source Code Download Page - Print Version](https://forums.kodeco.com/t/source-code-download-page-print-version/27902)
**Author:** [@crispy8888](https://forums.kodeco.com/u/crispy8888)\ **Replies:** 1\ **Last updated:** [November 25, 2022, 4:54pm UTC](https://forums.kodeco.com/t/source-code-download-page-print-version/27902 "2022-11-25T16:54:52Z")
You can find the downloadable source code for the print version here: https://www.raywenderlich.com/store/rxswift/rxswift-source-code --- ## [No such module ‘RxSwift’](https://forums.kodeco.com/t/no-such-module-rxswift/176258)
**Author:** [@lxirsh](https://forums.kodeco.com/u/lxirsh)\ **Replies:** 3\ **Last updated:** [October 5, 2022, 5:08am UTC](https://forums.kodeco.com/t/no-such-module-rxswift/176258 "2022-10-05T05:08:43Z")
None of the solutions mentioned in the various threads on this topic have worked for me, but I have found a workaround. I just created a new project using CocoaPods to install the RxSwift dependencies, and imported the p… --- ## [Chapter 6 No such module as RxSwift](https://forums.kodeco.com/t/chapter-6-no-such-module-as-rxswift/178798)
**Author:** [@saitowag](https://forums.kodeco.com/u/saitowag)\ **Replies:** 1\ **Last updated:** [September 25, 2022, 6:21pm UTC](https://forums.kodeco.com/t/chapter-6-no-such-module-as-rxswift/178798 "2022-09-25T18:21:22Z")
Hi, I have run pod install but still I am getting the error No such module ‘RxSwift’ and the project is not building. --- ## [V3.0 / Chapter 2 - No such module RxSwift](https://forums.kodeco.com/t/v3-0-chapter-2-no-such-module-rxswift/65750)
**Author:** [@jecht83](https://forums.kodeco.com/u/jecht83)\ **Replies:** 50\ **Last updated:** [September 13, 2022, 2:37pm UTC](https://forums.kodeco.com/t/v3-0-chapter-2-no-such-module-rxswift/65750 "2022-09-13T14:37:52Z")
Already tried many of the approaches from other threads with no success I’m trying with Xcode 10.1 by running ./bootstrap.sh from terminal after that Xcode will open with this errors --- ## [Chapter 4 - "Error returned from daemon: Error Domain=com.apple.accounts Code=7 "(null)"" completed photo selection](https://forums.kodeco.com/t/chapter-4-error-returned-from-daemon-error-domain-com-apple-accounts-code-7-null-completed-photo-selection/118476)
**Author:** [@andreskwan](https://forums.kodeco.com/u/andreskwan)\ **Replies:** 10\ **Last updated:** [August 17, 2022, 11:26am UTC](https://forums.kodeco.com/t/chapter-4-error-returned-from-daemon-error-domain-com-apple-accounts-code-7-null-completed-photo-selection/118476 "2022-08-17T11:26:26Z")
Hi, “Error returned from daemon: Error Domain=com.apple.accounts Code=7 “(null)”” completed photo selection I’m getting this error in both the starter and final projects, this happens every time I’m in PhotosViewContr… --- ## [Chapter 11 - API and other issues](https://forums.kodeco.com/t/chapter-11-api-and-other-issues/174084)
**Author:** [@dragosionel](https://forums.kodeco.com/u/dragosionel)\ **Replies:** 1\ **Last updated:** [August 16, 2022, 7:19am UTC](https://forums.kodeco.com/t/chapter-11-api-and-other-issues/174084 "2022-08-16T07:19:01Z")
I spent some time trying to get it to work. I made the following changes: class EONET { static let API = "https://eonet.gsfc.nasa.gov/api/v3" struct EOCategory: Decodable { let id: String struct EOEventCategory: De… --- ## [Need help understanding map with bool value (Ch. 13.)](https://forums.kodeco.com/t/need-help-understanding-map-with-bool-value-ch-13/168477)
**Author:** [@lxirsh](https://forums.kodeco.com/u/lxirsh)\ **Replies:** 3\ **Last updated:** [August 4, 2022, 7:42pm UTC](https://forums.kodeco.com/t/need-help-understanding-map-with-bool-value-ch-13/168477 "2022-08-04T19:42:23Z")
In chapter 13 there is this bit of code: let running = Observable.merge( searchInput.map { \_ in true }, search.map { \_ in false }.asObservable() ) .startWith(true) .asDriver(onErrorJustReturn: false) And … --- ## [Chapter 7 - Challenge Question](https://forums.kodeco.com/t/chapter-7-challenge-question/170758)
**Author:** [@jagjayo](https://forums.kodeco.com/u/jagjayo)\ **Replies:** 1\ **Last updated:** [May 10, 2022, 6:29pm UTC](https://forums.kodeco.com/t/chapter-7-challenge-question/170758 "2022-05-10T18:29:20Z")
Hello I’m working on challenge(ing). I solved myself but have an unsolved question. Here is my code. Added only code that i wrote. let input = PublishSubject\() // Add your code here input .skipWhile({ … --- ## [Chapter 2 - Type 'Result\' has no member 'error'](https://forums.kodeco.com/t/chapter-2-type-result-string-error-has-no-member-error/158871)
**Author:** [@lmw41](https://forums.kodeco.com/u/lmw41)\ **Replies:** 2\ **Last updated:** [May 2, 2022, 11:58am UTC](https://forums.kodeco.com/t/chapter-2-type-result-string-error-has-no-member-error/158871 "2022-05-02T11:58:10Z")
I got the error when using single, like the code below. guard let path = Bundle.main.path(forResource: name, ofType: “txt”) else { single(.error(FileReadError.fileNotFound)) return disposable } The error message fro… --- ## [Chapter 4. Disposing subscriptions — review](https://forums.kodeco.com/t/chapter-4-disposing-subscriptions-review/167613)
**Author:** [@egorskikh](https://forums.kodeco.com/u/egorskikh)\ **Replies:** 2\ **Last updated:** [April 2, 2022, 5:44pm UTC](https://forums.kodeco.com/t/chapter-4-disposing-subscriptions-review/167613 "2022-04-02T17:44:29Z")
I did everything as it is written in the book. I didn’t add my code. I go to the screen PhotosViewController 9 times. I’m trying to deal with memory at this point. In the console it prints: completed photo selection -… --- ## [Chapter 17 can't show UIImage](https://forums.kodeco.com/t/chapter-17-cant-show-uiimage/161041)
**Author:** [@hajime001](https://forums.kodeco.com/u/hajime001)\ **Replies:** 3\ **Last updated:** [April 2, 2022, 4:26pm UTC](https://forums.kodeco.com/t/chapter-17-cant-show-uiimage/161041 "2022-04-02T16:26:32Z")
I followed the text book from starter project but can’t properly show a image. Even tried out the final version but could not get an image as well. The console showed iGif\[1147:179544\] Connection 5: unable to determi… --- ## [\[Chapter 12 - 4th edition\] There's something wrong here](https://forums.kodeco.com/t/chapter-12-4th-edition-theres-something-wrong-here/148968)
**Author:** [@tringuyen623](https://forums.kodeco.com/u/tringuyen623)\ **Replies:** 0\ **Last updated:** [September 29, 2021, 9:23am UTC](https://forums.kodeco.com/t/chapter-12-4th-edition-theres-something-wrong-here/148968 "2021-09-29T09:23:00Z")
In the digital version I see this one error let searchInput = searchCityName.rx .controlEvent(.editingDidEndOnExit)g .map { self.searchCityName.text ?? "" } .filter { !$0.isEmpty } what is “g” after .controlEven… --- ## [Chapter 2 - cannot find 'Observable' in scope](https://forums.kodeco.com/t/chapter-2-cannot-find-observable-in-scope/145672)
**Author:** [@peterhwang](https://forums.kodeco.com/u/peterhwang)\ **Replies:** 2\ **Last updated:** [August 16, 2021, 4:32pm UTC](https://forums.kodeco.com/t/chapter-2-cannot-find-observable-in-scope/145672 "2021-08-16T16:32:14Z")
As you see the screenshot, I got error messages “cannot find ‘Observable’ in scope”. I didi run bootstrap.sh, already. What’s wrong? :cry: Thank you for your help and hint --- ## [Chapter 3 - No such module 'RxRelay'](https://forums.kodeco.com/t/chapter-3-no-such-module-rxrelay/144325)
**Author:** [@geoffdc](https://forums.kodeco.com/u/geoffdc)\ **Replies:** 1\ **Last updated:** [August 10, 2021, 1:55am UTC](https://forums.kodeco.com/t/chapter-3-no-such-module-rxrelay/144325 "2021-08-10T01:55:59Z")
Reopening this topic because I am still encountering this issue. Doesn’t look like a resolution was reached in the previous locked thread Chapter 3 RxRelay I have checked the “Build Active Scheme” box but still see the… --- ## [12.2 searchCityName](https://forums.kodeco.com/t/12-2-searchcityname/145826)
**Author:** [@swiftlearnerlv](https://forums.kodeco.com/u/swiftlearnerlv)\ **Replies:** 1\ **Last updated:** [August 9, 2021, 11:42pm UTC](https://forums.kodeco.com/t/12-2-searchcityname/145826 "2021-08-09T23:42:29Z")
When using the code for the searchCityName in 12.2, searchCityName.rx.text.orEmpty .filter { !$0.isEmpty } .flatMap { text in ApiController.shared .currentWeather(for: text) .catchErrorJustReturn(.em… --- ## [Chapter 12 erratum - page 250](https://forums.kodeco.com/t/chapter-12-erratum-page-250/86202)
**Author:** [@culjakj](https://forums.kodeco.com/u/culjakj)\ **Replies:** 2\ **Last updated:** [August 9, 2021, 7:08am UTC](https://forums.kodeco.com/t/chapter-12-erratum-page-250/86202 "2021-08-09T07:08:21Z")
Hi! Expected the starter project source code to contain the dummy data implementation of ApiController.currentWeather function. Actual: it’s the final implementation returning live data. See page 250 of v3.0 of the bo… --- ## [Chapter 11 - No such module 'RxSwift'](https://forums.kodeco.com/t/chapter-11-no-such-module-rxswift/145357)
**Author:** [@aksvona](https://forums.kodeco.com/u/aksvona)\ **Replies:** 1\ **Last updated:** [August 6, 2021, 1:01pm UTC](https://forums.kodeco.com/t/chapter-11-no-such-module-rxswift/145357 "2021-08-06T13:01:54Z")
I’ve tried different approaches from different threads and no luck. I’m using Xcode 12.3 and running ./bootstrap.sh from terminal. This is really frustrating. --- ## [When opening playground RxSwift can't be found](https://forums.kodeco.com/t/when-opening-playground-rxswift-cant-be-found/141185)
**Author:** [@dubbawub](https://forums.kodeco.com/u/dubbawub)\ **Replies:** 0\ **Last updated:** [May 30, 2021, 11:48am UTC](https://forums.kodeco.com/t/when-opening-playground-rxswift-cant-be-found/141185 "2021-05-30T11:48:37Z")
sed: Libs/RxSwift/Rx.xcodeproj/project.pbxproj: No such file or directory sed: Libs/RxSwift/Rx.xcodeproj/project.pbxproj: No such file or directory First 5 or so projects’ve been launched successfully, but then this … --- ## [Chapter 3 RxRelay](https://forums.kodeco.com/t/chapter-3-rxrelay/129378)
**Author:** [@odyflame](https://forums.kodeco.com/u/odyflame)\ **Replies:** 6\ **Last updated:** [April 20, 2021, 1:14am UTC](https://forums.kodeco.com/t/chapter-3-rxrelay/129378 "2021-04-20T01:14:40Z")
when i .bootstrap/sh clear and run, there is no problem with RxSwift, but when import RxRelay, there is an error no such modul RxRelay what should i do? i cleanup buiild, run .bootstrap and more…but it doesn’t working … --- ## [Chapter 24 (MVVM) API Error Running Starter/Final](https://forums.kodeco.com/t/chapter-24-mvvm-api-error-running-starter-final/119724)
**Author:** [@jstheoriginal](https://forums.kodeco.com/u/jstheoriginal)\ **Replies:** 1\ **Last updated:** [April 11, 2021, 6:36am UTC](https://forums.kodeco.com/t/chapter-24-mvvm-api-error-running-starter-final/119724 "2021-04-11T06:36:31Z")
When running the starter project (and final as well), after hooking up the iOS View Controller bindings, I’m getting this rxFatalErrorInDebug API error: \[Response\]: \ { URL: https://api… --- ## [Chapter 12 - Improve Challenge Solution](https://forums.kodeco.com/t/chapter-12-improve-challenge-solution/29258)
**Author:** [@louisbur](https://forums.kodeco.com/u/louisbur)\ **Replies:** 2\ **Last updated:** [April 10, 2021, 2:04pm UTC](https://forums.kodeco.com/t/chapter-12-improve-challenge-solution/29258 "2021-04-10T14:04:18Z")
Hi, The solution for chapter 12’s challenge is: let textSearch = searchCityName.rx.controlEvent(.editingDidEndOnExit).asObservable() let temperature = tempSwitch.rx.controlEvent(.valueChanged).asObservable() let searc… --- ## [Chapter 5~6 Combinationstargram](https://forums.kodeco.com/t/chapter-5-6-combinationstargram/129477)
**Author:** [@odyflame](https://forums.kodeco.com/u/odyflame)\ **Replies:** 1\ **Last updated:** [April 8, 2021, 4:06am UTC](https://forums.kodeco.com/t/chapter-5-6-combinationstargram/129477 "2021-04-08T04:06:41Z")
the Combinationstagram App, there are some bugs that only recent picture can selected. in my case, only yesterday’s picture can selected other picture doesn’t working. [Next page](https://forums.kodeco.com/c/books/rxswift/30.md?page=1)