# šŸ“š Official Books **URL:** https://forums.kodeco.com/c/books/6.md?page=25 [Latest](https://forums.kodeco.com/latest.md) Ā· [Categories](https://forums.kodeco.com/categories.md) Ā· [Tags](https://forums.kodeco.com/tags.md) **Page:** 26 --- ## [Unable to reproduce the cycled dependency in chapter 8](https://forums.kodeco.com/t/unable-to-reproduce-the-cycled-dependency-in-chapter-8/175214)
**Author:** [@nh123](https://forums.kodeco.com/u/nh123)\ **Replies:** 0\ **Last updated:** [July 19, 2022, 2:34pm UTC](https://forums.kodeco.com/t/unable-to-reproduce-the-cycled-dependency-in-chapter-8/175214 "2022-07-19T14:34:21Z")
Has anyone actually done the code changes related to CycledSequencePresenter (pages 216-218) that are supposed to lead to a dependency cycle? I think I have everything in place, but get no build or runtime error. --- ## [Enhancing Your UI](https://forums.kodeco.com/t/enhancing-your-ui/174805)
**Author:** [@doer](https://forums.kodeco.com/u/doer)\ **Replies:** 3\ **Last updated:** [July 18, 2022, 11:56am UTC](https://forums.kodeco.com/t/enhancing-your-ui/174805 "2022-07-18T11:56:51Z")
In section two of this book, we were made to refactor our codes into modules.However upon reaching section 3 of this book, enhancing your ui, the source code for this chapter have been refactored back to the old way withā€¦ --- ## [A problem about a functions in 6.8 Optimizing COW](https://forums.kodeco.com/t/a-problem-about-a-functions-in-6-8-optimizing-cow/174798)
**Author:** [@ys\_xs](https://forums.kodeco.com/u/ys_xs)\ **Replies:** 1\ **Last updated:** [July 18, 2022, 11:42am UTC](https://forums.kodeco.com/t/a-problem-about-a-functions-in-6-8-optimizing-cow/174798 "2022-07-18T11:42:37Z")
A minor predicament hiļ½ž I have a question. Why does this code in the article missing the sentence ā€œtail = newNodeā€ Copynodes() has, but copyNodes(returningCopyOf:) has not private mutating func copyNodes(returninā€¦ --- ## [Simulator question](https://forums.kodeco.com/t/simulator-question/174883)
**Author:** [@slyone](https://forums.kodeco.com/u/slyone)\ **Replies:** 1\ **Last updated:** [July 18, 2022, 11:41am UTC](https://forums.kodeco.com/t/simulator-question/174883 "2022-07-18T11:41:27Z")
Design Patterns by Tutorials This might seem silly, but what device did you set the simulator for testing your code? Iā€™m using Xcode 13. --- ## [How to stream a video in Compose](https://forums.kodeco.com/t/how-to-stream-a-video-in-compose/175097)
**Author:** [@arun\_95](https://forums.kodeco.com/u/arun_95)\ **Replies:** 0\ **Last updated:** [July 18, 2022, 6:47am UTC](https://forums.kodeco.com/t/how-to-stream-a-video-in-compose/175097 "2022-07-18T06:47:44Z")
Hi Everyone, i am developing a compose application where video view must be populated which will hold the stream of video from user (i.e) similar to a video call . I have used the zoom provider for the video stream . Kinā€¦ --- ## [Regarding Jetpack Bottom Navigation](https://forums.kodeco.com/t/regarding-jetpack-bottom-navigation/175094)
**Author:** [@arun\_95](https://forums.kodeco.com/u/arun_95)\ **Replies:** 0\ **Last updated:** [July 18, 2022, 3:50am UTC](https://forums.kodeco.com/t/regarding-jetpack-bottom-navigation/175094 "2022-07-18T03:50:46Z")
Hi everyone. I am working in android platform where i have a bottom navigation view which has 4 icons(video, Audio, chat and settings), In which one of the icon Audio has to be only toggle option say on tap the audio muā€¦ --- ## [JetPack Compose Navigation - Custom Action](https://forums.kodeco.com/t/jetpack-compose-navigation-custom-action/174311)
**Author:** [@arun\_95](https://forums.kodeco.com/u/arun_95)\ **Replies:** 3\ **Last updated:** [July 16, 2022, 8:57pm UTC](https://forums.kodeco.com/t/jetpack-compose-navigation-custom-action/174311 "2022-07-16T20:57:43Z")
I am working in android platform where i have a bottom navigation view which has 4 icons(video, Audio, chat and settings), I need a scenario to be sorted, In which one of the icon ā€œAudioā€ has to be only toggle option saā€¦ --- ## [Different ways to retrieve Parent-Child and Sibling relationships?](https://forums.kodeco.com/t/different-ways-to-retrieve-parent-child-and-sibling-relationships/174974)
**Author:** [@delaney](https://forums.kodeco.com/u/delaney)\ **Replies:** 1\ **Last updated:** [July 16, 2022, 12:23pm UTC](https://forums.kodeco.com/t/different-ways-to-retrieve-parent-child-and-sibling-relationships/174974 "2022-07-16T12:23:44Z")
By chapter 17, Acronym has a parent relationship to User and a sibling relationship to Category. Fluent.ParentProperty and Fluent.SiblingsProperty both conform to Relation which is where get(reload:on:) is implemented. (ā€¦ --- ## [StoreSearch Landscape Broken on iPhone 8,11,12,13 & Pro](https://forums.kodeco.com/t/storesearch-landscape-broken-on-iphone-8-11-12-13-pro/173159)
**Author:** [@zenzat22](https://forums.kodeco.com/u/zenzat22)\ **Replies:** 5\ **Last updated:** [July 15, 2022, 2:51am UTC](https://forums.kodeco.com/t/storesearch-landscape-broken-on-iphone-8-11-12-13-pro/173159 "2022-07-15T02:51:23Z")
Thanks for writing such an incredible book. I enjoyed coding along with each project and gaining better insight into how things work in UIKit. One thing I found especially helpful is your consistent focus on optionals thā€¦ --- ## [Errata for Flutter Apprentice 2nd Edition](https://forums.kodeco.com/t/errata-for-flutter-apprentice-2nd-edition/149499)
**Author:** [@jellodiil](https://forums.kodeco.com/u/jellodiil)\ **Replies:** 139\ **Last updated:** [July 11, 2022, 9:49pm UTC](https://forums.kodeco.com/t/errata-for-flutter-apprentice-2nd-edition/149499 "2022-07-11T21:49:22Z")
Creating this topic to catch any typos and bugs in the 2nd Edition of Flutter Apprentice. --- ## [Chapter 13 - onDrop modifier](https://forums.kodeco.com/t/chapter-13-ondrop-modifier/174691)
**Author:** [@srofe](https://forums.kodeco.com/u/srofe)\ **Replies:** 1\ **Last updated:** [July 11, 2022, 3:43am UTC](https://forums.kodeco.com/t/chapter-13-ondrop-modifier/174691 "2022-07-11T03:43:12Z")
Thanks for this wonderful book. Great to see something on macOS and SwiftUI as opposed to the extensive coverage of the mobile side of things. I was implementing drag and drop in the CustomImageView in Chapter 13 and haā€¦ --- ## [17 Chapter 17: Making a Simple Web App, Part 2](https://forums.kodeco.com/t/17-chapter-17-making-a-simple-web-app-part-2/174608)
**Author:** [@emmanuel18909890](https://forums.kodeco.com/u/emmanuel18909890)\ **Replies:** 1\ **Last updated:** [July 9, 2022, 12:06am UTC](https://forums.kodeco.com/t/17-chapter-17-making-a-simple-web-app-part-2/174608 "2022-07-09T00:06:29Z")
Hello there, Iā€™m currently studying on Vapor and I have an issue with the javascript script ā€œcreateAcronymsā€. It doesnā€™t found http://localhost:8080/api/categories/. I have an error on the safari inspector : Failed to ā€¦ --- ## [Stack Challenge #2 - Code Review!](https://forums.kodeco.com/t/stack-challenge-2-code-review/170989)
**Author:** [@marlhex](https://forums.kodeco.com/u/marlhex)\ **Replies:** 2\ **Last updated:** [July 7, 2022, 6:42pm UTC](https://forums.kodeco.com/t/stack-challenge-2-code-review/170989 "2022-07-07T18:42:19Z")
Can someone review if this code is valid as a solution? - The difference is that Iā€™m not popping and Iā€™m using 2 different counters. The time complexity is still linear O(n), right? + Iā€™m still using stack methods. So apā€¦ --- ## [Charter 18 error: Publisher is only available in iOS 13.0](https://forums.kodeco.com/t/charter-18-error-publisher-is-only-available-in-ios-13-0/174165)
**Author:** [@felipefl](https://forums.kodeco.com/u/felipefl)\ **Replies:** 2\ **Last updated:** [July 7, 2022, 5:19pm UTC](https://forums.kodeco.com/t/charter-18-error-publisher-is-only-available-in-ios-13-0/174165 "2022-07-07T17:19:36Z")
ā€˜Publisherā€™ is only available in iOS 13.0 or newer extension Publisher { help me please --- ## ["Checklist" project, handle appearance when in dark mode](https://forums.kodeco.com/t/checklist-project-handle-appearance-when-in-dark-mode/174509)
**Author:** [@supergegs](https://forums.kodeco.com/u/supergegs)\ **Replies:** 1\ **Last updated:** [July 7, 2022, 7:18am UTC](https://forums.kodeco.com/t/checklist-project-handle-appearance-when-in-dark-mode/174509 "2022-07-07T07:18:56Z")
When running the final ā€œChecklistā€ project on my device, Iā€™ve noticed that there is no proper handling for a case when the device is in dark mode. The main effect is that the checklist icon will not show in the table cā€¦ --- ## [Basic to advanced swift](https://forums.kodeco.com/t/basic-to-advanced-swift/162794)
**Author:** [@hassanwa](https://forums.kodeco.com/u/hassanwa)\ **Replies:** 1\ **Last updated:** [July 7, 2022, 4:56am UTC](https://forums.kodeco.com/t/basic-to-advanced-swift/162794 "2022-07-07T04:56:52Z")
I should study which book of raywenderlich for studying swift from basic to advanced level? which book is the best? what is the difference in the books of swift apprentice and iOS apprentice? --- ## [Chapter 18 fileprivate](https://forums.kodeco.com/t/chapter-18-fileprivate/174291)
**Author:** [@schluter](https://forums.kodeco.com/u/schluter)\ **Replies:** 1\ **Last updated:** [July 7, 2022, 4:49am UTC](https://forums.kodeco.com/t/chapter-18-fileprivate/174291 "2022-07-07T04:49:35Z")
In the section discussing private and fileprivate concerning class CheckAccount, the following statement is made: ā€œRight now, nothing is preventing a haphazard coder who doesnā€™t read the documentation from creating a Chā€¦ --- ## [Chapter 6 adding items not working](https://forums.kodeco.com/t/chapter-6-adding-items-not-working/168251)
**Author:** [@geek2](https://forums.kodeco.com/u/geek2)\ **Replies:** 1\ **Last updated:** [July 6, 2022, 10:32pm UTC](https://forums.kodeco.com/t/chapter-6-adding-items-not-working/168251 "2022-07-06T22:32:41Z")
I guys i need help ! when i click on save button, it always return the Empty screen. It seems, groceryItems is alsways empty even i save an item. --- ## [Chapter 9: Context variable in "Adding a search button"](https://forums.kodeco.com/t/chapter-9-context-variable-in-adding-a-search-button/157017)
**Author:** [@matan188](https://forums.kodeco.com/u/matan188)\ **Replies:** 1\ **Last updated:** [November 15, 2021, 9:54am UTC](https://forums.kodeco.com/t/chapter-9-context-variable-in-adding-a-search-button/157017 "2021-11-15T09:54:44Z")
In the ā€œAdding a search buttonā€ section, we make use of a ā€œcontextā€ variable. However, it isnā€™t clear to me where this ā€œcontextā€ comes from as it doesnā€™t look like weā€™ve initialized it anywhere or gotten it from a callbaā€¦ --- ## [Can't Print Document Directory and find UserDefaults plist](https://forums.kodeco.com/t/cant-print-document-directory-and-find-userdefaults-plist/146262)
**Author:** [@gaspare92](https://forums.kodeco.com/u/gaspare92)\ **Replies:** 2\ **Last updated:** [August 17, 2021, 6:13pm UTC](https://forums.kodeco.com/t/cant-print-document-directory-and-find-userdefaults-plist/146262 "2021-08-17T18:13:54Z")
Chapter 8: Saving Settings. Iā€™m trying to print the document directory by adding .onAppear modifier but nothing is printed on the console. import SwiftUI @main struct HIITFitApp: App { var body: some Scene { Winā€¦ --- ## [Flutter Installation Problem on Windows](https://forums.kodeco.com/t/flutter-installation-problem-on-windows/159981)
**Author:** [@amoxe](https://forums.kodeco.com/u/amoxe)\ **Replies:** 3\ **Last updated:** [July 6, 2022, 1:10pm UTC](https://forums.kodeco.com/t/flutter-installation-problem-on-windows/159981 "2022-07-06T13:10:21Z")
Hello guys, iā€™ve just started learning flutter and in the installation phase , i faced a problem i extracted the flutter sdk folder in my C:/Users (didnā€™t put it in the program file folder) i set my environment variable ā€¦ --- ## [AVD list not working after reopening Android Studio](https://forums.kodeco.com/t/avd-list-not-working-after-reopening-android-studio/156517)
**Author:** [@gncov101](https://forums.kodeco.com/u/gncov101)\ **Replies:** 6\ **Last updated:** [July 6, 2022, 1:06pm UTC](https://forums.kodeco.com/t/avd-list-not-working-after-reopening-android-studio/156517 "2022-07-06T13:06:52Z")
Hi, I was working through Chapter 2 and had to stop for a while. I closed Android Studio at that time and quit the android emulator. I had several AVD devices in my list and working with my beginning recipe app. But tā€¦ --- ## [The ā€œFirstTimeā€ setting does not work](https://forums.kodeco.com/t/the-firsttime-setting-does-not-work/174444)
**Author:** [@nukutka](https://forums.kodeco.com/u/nukutka)\ **Replies:** 0\ **Last updated:** [July 6, 2022, 8:03am UTC](https://forums.kodeco.com/t/the-firsttime-setting-does-not-work/174444 "2022-07-06T08:03:40Z")
I see no ā€œListā€ checklist at the first launch after the 18 Chapter of the book. Can u help me? I have downloaded materials, it doesnt work there too. --- ## [How to use reflections with an Arcball camera?](https://forums.kodeco.com/t/how-to-use-reflections-with-an-arcball-camera/174194)
**Author:** [@masaldana2](https://forums.kodeco.com/u/masaldana2)\ **Replies:** 4\ **Last updated:** [July 5, 2022, 9:39am UTC](https://forums.kodeco.com/t/how-to-use-reflections-with-an-arcball-camera/174194 "2022-07-05T09:39:34Z")
Hello im following chapter 22 on reflections and changing the camera PlayerCamera() to ArcballCamera(), the reflections stop working. how can I fix it? should I use .target instead of position? hmmm thank you --- ## [\[Chapter 8\] - Need some explanation about vertex descriptor](https://forums.kodeco.com/t/chapter-8-need-some-explanation-about-vertex-descriptor/118862)
**Author:** [@harmansmith](https://forums.kodeco.com/u/harmansmith)\ **Replies:** 3\ **Last updated:** [July 4, 2022, 7:47am UTC](https://forums.kodeco.com/t/chapter-8-need-some-explanation-about-vertex-descriptor/118862 "2022-07-04T07:47:37Z")
Several things remained unclear to me in this chapter. I would be grateful if you can shed some light on these points: Why do we add a new attribute MDLVertexAttributeColor to the defaultVertexDescriptor. In the case oā€¦ --- ## [Chapter 6: PostgressSQL M1 docker error](https://forums.kodeco.com/t/chapter-6-postgresssql-m1-docker-error/174217)
**Author:** [@lordandrei](https://forums.kodeco.com/u/lordandrei)\ **Replies:** 2\ **Last updated:** [July 2, 2022, 3:49am UTC](https://forums.kodeco.com/t/chapter-6-postgresssql-m1-docker-error/174217 "2022-07-02T03:49:48Z")
So I ran this command in terminal: docker run --name postgres -e POSTGRES\_DB=vapor \\ -e POSTGRES\_USER=vapor -e POSTGRES\_PASSWORD=password \\ -p 5432:5432 -d postgres After deleting previous versions of postgres Iā€™m dealā€¦ --- ## [Strafing vector from side to side](https://forums.kodeco.com/t/strafing-vector-from-side-to-side/173222)
**Author:** [@nghiaphamsg](https://forums.kodeco.com/u/nghiaphamsg)\ **Replies:** 10\ **Last updated:** [July 1, 2022, 11:58am UTC](https://forums.kodeco.com/t/strafing-vector-from-side-to-side/173222 "2022-07-01T11:58:28Z")
Hi team ! In chapter 9: Camera Movement In the orange mark, I see you set ā€œ-forwardVector.xā€. But I donā€™t understand the difference yet if I set ā€œforwardVector.xā€. The result of the vector is the same when I manipuā€¦ --- ## [Chapter 6 - Am I crazy or is this chapter a lurch?](https://forums.kodeco.com/t/chapter-6-am-i-crazy-or-is-this-chapter-a-lurch/174185)
**Author:** [@kemmetdaniel](https://forums.kodeco.com/u/kemmetdaniel)\ **Replies:** 0\ **Last updated:** [July 1, 2022, 1:12am UTC](https://forums.kodeco.com/t/chapter-6-am-i-crazy-or-is-this-chapter-a-lurch/174185 "2022-07-01T01:12:37Z")
Hey all, So Iā€™m not quite sure what to do with chapter 6. It seems based on a bunch of advanced concepts that are going to be explained later in the book so my experience with it is basically just kinda ramming through ā€¦ --- ## [Ch 22 Google Auth - {"error":true,"reason":"Value required for key 'access\_token'."}](https://forums.kodeco.com/t/ch-22-google-auth-error-true-reason-value-required-for-key-access-token/67311)
**Author:** [@viper827](https://forums.kodeco.com/u/viper827)\ **Replies:** 11\ **Last updated:** [July 1, 2022, 12:22am UTC](https://forums.kodeco.com/t/ch-22-google-auth-error-true-reason-value-required-for-key-access-token/67311 "2022-07-01T00:22:30Z")
I am getting the following error at the final Run in the chapter. {"error":true,"reason":"Value required for key 'access\_token'."} I tried everything I could think of in my own code. Then I loaded up the starter projecā€¦ --- ## [Type erasure with AnySequence](https://forums.kodeco.com/t/type-erasure-with-anysequence/174082)
**Author:** [@shioramashvili](https://forums.kodeco.com/u/shioramashvili)\ **Replies:** 1\ **Last updated:** [June 30, 2022, 2:02pm UTC](https://forums.kodeco.com/t/type-erasure-with-anysequence/174082 "2022-06-30T14:02:10Z")
ā€œAlthough it hides implementation complexity, thereā€™s a minor penalty to this extra indirection. For example, if you wrap an Array in AnySequence (or AnyCollection ), youā€™ll no longer be able to access the contiguous stoā€¦ [Previous page](https://forums.kodeco.com/c/books/6.md?page=24) [Next page](https://forums.kodeco.com/c/books/6.md?page=26)