# š Official Books
**URL:** https://forums.kodeco.com/c/books/6.md?page=88
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**Page:** 89
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## [Out of the box errors building starter project for chapter 2](https://forums.kodeco.com/t/out-of-the-box-errors-building-starter-project-for-chapter-2/75486)
**Author:** [@clarryr](https://forums.kodeco.com/u/clarryr)\
**Replies:** 3\
**Last updated:** [August 21, 2019, 10:47pm UTC](https://forums.kodeco.com/t/out-of-the-box-errors-building-starter-project-for-chapter-2/75486 "2019-08-21T22:47:04Z")
I installed Realm and RealmSwift as directed. I ran the pod install in the starter project and opened XCode with the MyToDo.xcworkspace. Trying to build I get 3 errors: :-1: No account for team āSPN35K2MR2ā. Add a newā¦
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## [RxSwift Playground; Can't make it run](https://forums.kodeco.com/t/rxswift-playground-cant-make-it-run/29260)
**Author:** [@wiingaard](https://forums.kodeco.com/u/wiingaard)\
**Replies:** 18\
**Last updated:** [August 21, 2019, 10:44pm UTC](https://forums.kodeco.com/t/rxswift-playground-cant-make-it-run/29260 "2019-08-21T22:44:41Z")
Hello there, Iām reading RxSwift, so far a good book, thanks :slight\_smile: Iām trying to run the playground that was bundled with the book, but run into errors. Hereās what Iām doing: 1: Open āRxSwift.xcworkspaceā ā¦
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## [Chapter 8 share vs share(replay: 1) question](https://forums.kodeco.com/t/chapter-8-share-vs-share-replay-1-question/75293)
**Author:** [@josscii](https://forums.kodeco.com/u/josscii)\
**Replies:** 1\
**Last updated:** [August 21, 2019, 10:32pm UTC](https://forums.kodeco.com/t/chapter-8-share-vs-share-replay-1-question/75293 "2019-08-21T22:32:33Z")
description from the book: URLSession.rx.response(request:) sends your request to the server, and upon receiving the response, emits a .next event just once with the returned data, and then completes. In this situatā¦
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## [Chapter 20 Page 870](https://forums.kodeco.com/t/chapter-20-page-870/69376)
**Author:** [@mcneils](https://forums.kodeco.com/u/mcneils)\
**Replies:** 7\
**Last updated:** [August 21, 2019, 10:23pm UTC](https://forums.kodeco.com/t/chapter-20-page-870/69376 "2019-08-21T22:23:45Z")
In chapter 20 we add an init method for ChecklistItem. Why is it that it needs an override? We have an init in Checklist and that one doesnāt need an override.
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## [Errata, pre-release](https://forums.kodeco.com/t/errata-pre-release/75262)
**Author:** [@abunur](https://forums.kodeco.com/u/abunur)\
**Replies:** 3\
**Last updated:** [August 21, 2019, 10:02pm UTC](https://forums.kodeco.com/t/errata-pre-release/75262 "2019-08-21T22:02:48Z")
Topic for errata for the pre-release āBefore the test executes, you should receive two compilation error, which means this is a failing test! Congratulations!ā should be āBefore the test executes, you should receive tā¦
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## [Feedback : Table of contents within the pdf books](https://forums.kodeco.com/t/feedback-table-of-contents-within-the-pdf-books/62262)
**Author:** [@nidupb](https://forums.kodeco.com/u/nidupb)\
**Replies:** 3\
**Last updated:** [August 21, 2019, 9:33pm UTC](https://forums.kodeco.com/t/feedback-table-of-contents-within-the-pdf-books/62262 "2019-08-21T21:33:13Z")
Hi, I donāt know if itās the appropriate place to make a feedback regarding the books, if not, feel free to delete this post. Iām using preview with the pdf ebooks from Ray Wenderlich (itās not specific to swift apprenā¦
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## [Chapter 16 - Static Cell - viewWithTag](https://forums.kodeco.com/t/chapter-16-static-cell-viewwithtag/79384)
**Author:** [@rlau8530](https://forums.kodeco.com/u/rlau8530)\
**Replies:** 4\
**Last updated:** [August 21, 2019, 5:18am UTC](https://forums.kodeco.com/t/chapter-16-static-cell-viewwithtag/79384 "2019-08-21T05:18:04Z")
I created static cells with 3 rows in 1 section and tag them with 1,2,3 respectively. However, I tried to find those cells by using method viewWithTag but found nil. May I know how to solve it? Many thanks!!! Ricā¦
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## [Deploy from another computer](https://forums.kodeco.com/t/deploy-from-another-computer/79270)
**Author:** [@mattiav8](https://forums.kodeco.com/u/mattiav8)\
**Replies:** 2\
**Last updated:** [August 19, 2019, 6:13pm UTC](https://forums.kodeco.com/t/deploy-from-another-computer/79270 "2019-08-19T18:13:30Z")
Good Morning, Iād like to know if it could be possible to deploy in vapor from a different computer after deploying in another one. I tried once, after āvapor cloud loginā but system didnāt find any application. It woulā¦
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## [Many to many pivot with additional variables](https://forums.kodeco.com/t/many-to-many-pivot-with-additional-variables/77877)
**Author:** [@ramelan](https://forums.kodeco.com/u/ramelan)\
**Replies:** 3\
**Last updated:** [August 19, 2019, 1:08am UTC](https://forums.kodeco.com/t/many-to-many-pivot-with-additional-variables/77877 "2019-08-19T01:08:20Z")
Hi, Iām trying to create a many to many relationship with additional variables but can not find any examples. I have User and Group objects and want to create if a user has either view or write privileges for groups. hā¦
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## [BullsEye.html webView not loading](https://forums.kodeco.com/t/bullseye-html-webview-not-loading/79316)
**Author:** [@format1998](https://forums.kodeco.com/u/format1998)\
**Replies:** 3\
**Last updated:** [August 19, 2019, 12:19am UTC](https://forums.kodeco.com/t/bullseye-html-webview-not-loading/79316 "2019-08-19T00:19:33Z")
Everything was going fine with the project until I tried to add webView I connected it and everything looked at past members problems. This is the error I am getting. 2019-08-17 17:31:18.021944-1000 BullsEye\[29894:101ā¦
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## [Delete a "builder.unique" property](https://forums.kodeco.com/t/delete-a-builder-unique-property/79113)
**Author:** [@mattiav8](https://forums.kodeco.com/u/mattiav8)\
**Replies:** 2\
**Last updated:** [August 15, 2019, 11:12am UTC](https://forums.kodeco.com/t/delete-a-builder-unique-property/79113 "2019-08-15T11:12:36Z")
Hello everyone, I would like to delete the email unique property because a user can have more account with the same email. I didnāt find any tip on how to do it, and I really hope someone could help. Thank you very mucā¦
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## [Error, chapter 5](https://forums.kodeco.com/t/error-chapter-5/78998)
**Author:** [@lac\_ekim](https://forums.kodeco.com/u/lac_ekim)\
**Replies:** 1\
**Last updated:** [August 14, 2019, 9:38pm UTC](https://forums.kodeco.com/t/error-chapter-5/78998 "2019-08-14T21:38:02Z")
having a issue with new var ādifferenceā ālet message = āThe value of the slider is: (currentValue)ā + ā\\nThe target value is: (targetValue)ā + "\\nThe difference is: (difference)ā Excerpt From: By Fahim Farook. āiOS ā¦
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## [Modeling complex JSON](https://forums.kodeco.com/t/modeling-complex-json/44851)
**Author:** [@rcutshaw](https://forums.kodeco.com/u/rcutshaw)\
**Replies:** 10\
**Last updated:** [August 14, 2019, 4:24pm UTC](https://forums.kodeco.com/t/modeling-complex-json/44851 "2019-08-14T16:24:47Z")
I wrote a little app after watching your tutorial videos. It models a JSON array of dictionaries: \[ { ā\_\_typeā: āCollectionSet:#MobileServicesā, āidā: 1, āoperationSuccessā: true, āSetNameā: āSpring 2 2018ā }, { ā¦
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## [Am I using Rx and MVVM correctly here?](https://forums.kodeco.com/t/am-i-using-rx-and-mvvm-correctly-here/78721)
**Author:** [@mfilipowicz](https://forums.kodeco.com/u/mfilipowicz)\
**Replies:** 1\
**Last updated:** [August 14, 2019, 12:49pm UTC](https://forums.kodeco.com/t/am-i-using-rx-and-mvvm-correctly-here/78721 "2019-08-14T12:49:48Z")
Iāve got a UIPageViewController with 3 pages. Iām using RxSwift and Cocoa to change the content of each page depending on which page view controller is currently shown. I have the following property in my UIPageViewContā¦
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## [Object is not deinitialized when the array is deallocated](https://forums.kodeco.com/t/object-is-not-deinitialized-when-the-array-is-deallocated/79004)
**Author:** [@ertugrul](https://forums.kodeco.com/u/ertugrul)\
**Replies:** 0\
**Last updated:** [August 14, 2019, 1:14am UTC](https://forums.kodeco.com/t/object-is-not-deinitialized-when-the-array-is-deallocated/79004 "2019-08-14T01:14:12Z")
Hi everyone! In the page 461 of iOS Apprentice Book, it is written that "The special deinit method will be invoked when you delete an individual ChecklistItem but also when you delete a whole Checklist ā because all iā¦
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## [Bobblehead Wars Platform Model is uncolored](https://forums.kodeco.com/t/bobblehead-wars-platform-model-is-uncolored/78730)
**Author:** [@danieleciti](https://forums.kodeco.com/u/danieleciti)\
**Replies:** 4\
**Last updated:** [August 13, 2019, 5:47pm UTC](https://forums.kodeco.com/t/bobblehead-wars-platform-model-is-uncolored/78730 "2019-08-13T17:47:02Z")
As you read on the title, the model platform is colorless. How can I fix it? Thank you!
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## [Chapter 8 closures](https://forums.kodeco.com/t/chapter-8-closures/67818)
**Author:** [@dmitrigrin](https://forums.kodeco.com/u/dmitrigrin)\
**Replies:** 2\
**Last updated:** [August 13, 2019, 3:54pm UTC](https://forums.kodeco.com/t/chapter-8-closures/67818 "2019-08-13T15:54:44Z")
Hi, While trying to get familiar with closures, I 'm facing other mismatches. No problems with closures functionality. Wonder why playground doesnāt let me run this code:
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## [Projectile isn't always hitting ArenaBobble Mesh Collider](https://forums.kodeco.com/t/projectile-isnt-always-hitting-arenabobble-mesh-collider/78746)
**Author:** [@instig](https://forums.kodeco.com/u/instig)\
**Replies:** 1\
**Last updated:** [August 13, 2019, 3:52pm UTC](https://forums.kodeco.com/t/projectile-isnt-always-hitting-arenabobble-mesh-collider/78746 "2019-08-13T15:52:02Z")
I have implemented pooling for my projectile, where it adds the projectile to a pool once it collides with the BobbleArena / Alien / Columns (Ch. 4, Page 108). However, I found that if I stand close to the arena walls, ā¦
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## [Will update SwiftUI?](https://forums.kodeco.com/t/will-update-swiftui/78841)
**Author:** [@yoshiboarder](https://forums.kodeco.com/u/yoshiboarder)\
**Replies:** 1\
**Last updated:** [August 13, 2019, 2:24pm UTC](https://forums.kodeco.com/t/will-update-swiftui/78841 "2019-08-13T14:24:20Z")
Will RW update SwiftUI for iOS Animations?
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## [MyLocation Chapter 28](https://forums.kodeco.com/t/mylocation-chapter-28/78695)
**Author:** [@feanor](https://forums.kodeco.com/u/feanor)\
**Replies:** 2\
**Last updated:** [August 10, 2019, 3:39am UTC](https://forums.kodeco.com/t/mylocation-chapter-28/78695 "2019-08-10T03:39:17Z")
I deleted all the tagged location item in my simulator, then when I try to tag a new location and save it, the app crashed. Does anyone know how to avoid unwrapping this nil optional?
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## [CH 13: Binary Tree Challenge 2, \`deserialize\` function is not working](https://forums.kodeco.com/t/ch-13-binary-tree-challenge-2-deserialize-function-is-not-working/77653)
**Author:** [@yhkung](https://forums.kodeco.com/u/yhkung)\
**Replies:** 2\
**Last updated:** [August 9, 2019, 9:28am UTC](https://forums.kodeco.com/t/ch-13-binary-tree-challenge-2-deserialize-function-is-not-working/77653 "2019-08-09T09:28:00Z")
I was trying to solve challenge problems. After hours of try, I still canāt solve this. So, I peek the final project to see how this function works, But itās not working :frowning: the deserialze function result a compā¦
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## [Chapter 6. App crash bug](https://forums.kodeco.com/t/chapter-6-app-crash-bug/77565)
**Author:** [@comeonyoh](https://forums.kodeco.com/u/comeonyoh)\
**Replies:** 4\
**Last updated:** [August 9, 2019, 6:39am UTC](https://forums.kodeco.com/t/chapter-6-app-crash-bug/77565 "2019-08-09T06:39:19Z")
Hi. there are a bug when executing your sample proejct on xcode. The app have crashed in cellForRow method of tableView. Especially āguard let cgImage = context.createCGImage(output, from: fromRect)ā The error messageā¦
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## [No such module 'RealmSwift' error in playground](https://forums.kodeco.com/t/no-such-module-realmswift-error-in-playground/53345)
**Author:** [@amirfl](https://forums.kodeco.com/u/amirfl)\
**Replies:** 9\
**Last updated:** [August 8, 2019, 10:49pm UTC](https://forums.kodeco.com/t/no-such-module-realmswift-error-in-playground/53345 "2019-08-08T22:49:14Z")
Iāve installed the bootstrap script with no errors. However, xcode complains " No such module āRealmSwiftā " in the playground when trying to import RealmSwift. Using Xcode 10 and version 1.1 of the course.
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## [Chapter 11: Testing on Linus](https://forums.kodeco.com/t/chapter-11-testing-on-linus/78205)
**Author:** [@jjjeeerrr111](https://forums.kodeco.com/u/jjjeeerrr111)\
**Replies:** 2\
**Last updated:** [August 8, 2019, 4:12pm UTC](https://forums.kodeco.com/t/chapter-11-testing-on-linus/78205 "2019-08-08T16:12:02Z")
Running the docker-compose build command in terminal spits out errors: $ docker-compose build postgres uses an image, skipping Building til-app Step 1/6 : FROM swift:4.2 ā\> 1531aac77f45 Step 2/6 : WORKDIR /package ā¦
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## [Is using another CoreData context inside perform method of a context a problem?](https://forums.kodeco.com/t/is-using-another-coredata-context-inside-perform-method-of-a-context-a-problem/77846)
**Author:** [@frank82](https://forums.kodeco.com/u/frank82)\
**Replies:** 9\
**Last updated:** [August 8, 2019, 2:05pm UTC](https://forums.kodeco.com/t/is-using-another-coredata-context-inside-perform-method-of-a-context-a-problem/77846 "2019-08-08T14:05:30Z")
Hi, in your book āConcurrency by Tutorialsā in āChapter 11: Core Dataā you are writing on page 98: āCore Data will generate a new context on a private queue for you to work with so that you donāt have to worry about anyā¦
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## [AR Platform Setup - Unity 2019 & AR Foundation 2.1.1](https://forums.kodeco.com/t/ar-platform-setup-unity-2019-ar-foundation-2-1-1/77117)
**Author:** [@ericlm](https://forums.kodeco.com/u/ericlm)\
**Replies:** 2\
**Last updated:** [August 8, 2019, 6:44am UTC](https://forums.kodeco.com/t/ar-platform-setup-unity-2019-ar-foundation-2-1-1/77117 "2019-08-08T06:44:07Z")
Hello, I recently downloaded the sample code of the Unity AR & VR book, and I tried to test it with Unity 2019.1.10 and AR Foundation 2.1.1. I set all the components on the GameObjects as required in the book, but the bā¦
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## [SKS animation problem - in editor it works, but not on emulator](https://forums.kodeco.com/t/sks-animation-problem-in-editor-it-works-but-not-on-emulator/78281)
**Author:** [@scloud](https://forums.kodeco.com/u/scloud)\
**Replies:** 2\
**Last updated:** [August 5, 2019, 7:55pm UTC](https://forums.kodeco.com/t/sks-animation-problem-in-editor-it-works-but-not-on-emulator/78281 "2019-08-05T19:55:34Z")
Hello! Iām trying to create simple scene, where cat moves his tale, andā¦ in editor all works fine, but when game running, animation doesnāt work. Can anyone know, what iām doing wrong?
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## [Tree Deserialize solution bug](https://forums.kodeco.com/t/tree-deserialize-solution-bug/70861)
**Author:** [@oaranger](https://forums.kodeco.com/u/oaranger)\
**Replies:** 2\
**Last updated:** [August 5, 2019, 7:28pm UTC](https://forums.kodeco.com/t/tree-deserialize-solution-bug/70861 "2019-08-05T19:28:47Z")
Hello, On page 339, solution for deserialize the tree need extra condition // 2 guard let value = array.removeFirst() else { should be changed to: // 2 guard !array.isEmpty, let value = array.removeFirst() else { Oā¦
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## [Implement The Singleton Pattern for Persistency managers Swift](https://forums.kodeco.com/t/implement-the-singleton-pattern-for-persistency-managers-swift/77445)
**Author:** [@a-elnajjar](https://forums.kodeco.com/u/a-elnajjar)\
**Replies:** 3\
**Last updated:** [August 5, 2019, 8:01am UTC](https://forums.kodeco.com/t/implement-the-singleton-pattern-for-persistency-managers-swift/77445 "2019-08-05T08:01:48Z")
am creating an iOS app and I want to implement Singleton Pattern. I have created āSingletonā LibraryAPI to act as an entry point UserManager object to get data from web API. after that I used a facade Pattern āmethodā toā¦
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## [Chapter 7 Reference Error](https://forums.kodeco.com/t/chapter-7-reference-error/77764)
**Author:** [@andkot1](https://forums.kodeco.com/u/andkot1)\
**Replies:** 8\
**Last updated:** [August 4, 2019, 4:46pm UTC](https://forums.kodeco.com/t/chapter-7-reference-error/77764 "2019-08-04T16:46:42Z")
The code you provided throws an āunresolved referenceā error on line 28 of chapter 7. 28 listsRecyclerView = findViewById(R.id.lists\_recyclerview) ālists\_recyclerviewā throws an error in Android Studio 3.4.2 Whaā¦
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