# šŸ“š Official Books **URL:** https://forums.kodeco.com/c/books/6.md?page=84 [Latest](https://forums.kodeco.com/latest.md) Ā· [Categories](https://forums.kodeco.com/categories.md) Ā· [Tags](https://forums.kodeco.com/tags.md) **Page:** 85 --- ## [Ch. 8 PreferenceManager Deprecated](https://forums.kodeco.com/t/ch-8-preferencemanager-deprecated/85542)
**Author:** [@kdewitt](https://forums.kodeco.com/u/kdewitt)\ **Replies:** 3\ **Last updated:** [October 20, 2019, 11:18pm UTC](https://forums.kodeco.com/t/ch-8-preferencemanager-deprecated/85542 "2019-10-20T23:18:13Z")
Everything is working as described in the book but Iā€™m wondering what changes I need to make to account for the deprecation of the PreferenceManager class. Amongst other things I tried importing androidx.preference.Prefā€¦ --- ## [Coordinator and UITabBarController](https://forums.kodeco.com/t/coordinator-and-uitabbarcontroller/69239)
**Author:** [@rastislv](https://forums.kodeco.com/u/rastislv)\ **Replies:** 6\ **Last updated:** [October 17, 2019, 4:44pm UTC](https://forums.kodeco.com/t/coordinator-and-uitabbarcontroller/69239 "2019-10-17T16:44:01Z")
Hi, i just ended chapter with coordinator and I am a little bit confused with differences between coordinators and routers. Also, when I am using UITabBarController should I initiate in appdelegaterouter or create it as ā€¦ --- ## [Chapter 8: Collage - Clear Function fails](https://forums.kodeco.com/t/chapter-8-collage-clear-function-fails/84599)
**Author:** [@robsnow68](https://forums.kodeco.com/u/robsnow68)\ **Replies:** 2\ **Last updated:** [October 19, 2019, 9:31am UTC](https://forums.kodeco.com/t/chapter-8-collage-clear-function-fails/84599 "2019-10-19T09:31:03Z")
Loving the early release previews. In the Collage project, the clear function: @IBAction func actionClear() { images.send(\[\]) } ā€¦works perfectly when adding the single image. However, as soon as you subscribe to theā€¦ --- ## [In Chapter 11 I get an Error when a QRCode is detected](https://forums.kodeco.com/t/in-chapter-11-i-get-an-error-when-a-qrcode-is-detected/76973)
**Author:** [@perlguy](https://forums.kodeco.com/u/perlguy)\ **Replies:** 6\ **Last updated:** [October 18, 2019, 9:37am UTC](https://forums.kodeco.com/t/in-chapter-11-i-get-an-error-when-a-qrcode-is-detected/76973 "2019-10-18T09:37:28Z")
Iā€™m still trying to find the cause of this issue, but Iā€™m putting it out there in case others encounter it. I am right before the ā€œPlaying a videoā€ section of the chapter, and when I run the code and detect a QRCode, I ā€¦ --- ## [Initial problems in rxjava tutorial](https://forums.kodeco.com/t/initial-problems-in-rxjava-tutorial/85028)
**Author:** [@flatrocktech](https://forums.kodeco.com/u/flatrocktech)\ **Replies:** 1\ **Last updated:** [October 17, 2019, 8:03pm UTC](https://forums.kodeco.com/t/initial-problems-in-rxjava-tutorial/85028 "2019-10-17T20:03:04Z")
on page 209, i think there is problem of PublishSubject initialize val sourceObservable = PublishSubject\() // correct : PublishSubject.create\() sourceObservable.subscribe(buffer\_1) sourceObservable ā€¦ --- ## [SoyBoy save times function](https://forums.kodeco.com/t/soyboy-save-times-function/82031)
**Author:** [@ghostwolf](https://forums.kodeco.com/u/ghostwolf)\ **Replies:** 2\ **Last updated:** [October 17, 2019, 5:24pm UTC](https://forums.kodeco.com/t/soyboy-save-times-function/82031 "2019-10-17T17:24:42Z")
For some reason when I build the game and play the times will not save. If I play the game in unity it does. The strange thing is that if I go back to the build version the times show up and it write new ones. I was wondā€¦ --- ## [Trying to use pool in Kitura server app](https://forums.kodeco.com/t/trying-to-use-pool-in-kitura-server-app/81091)
**Author:** [@garths](https://forums.kodeco.com/u/garths)\ **Replies:** 5\ **Last updated:** [October 16, 2019, 5:49pm UTC](https://forums.kodeco.com/t/trying-to-use-pool-in-kitura-server-app/81091 "2019-10-16T17:49:21Z")
In application the app class you are calling Persistence.setUp(). But you are not passing ā€œpoolā€ var out of it. So in my application when I want to use SwiftKuery raw sql and access the pool for a connection there doesā€¦ --- ## [Chapter 29: WebSockets](https://forums.kodeco.com/t/chapter-29-websockets/80685)
**Author:** [@kasimok](https://forums.kodeco.com/u/kasimok)\ **Replies:** 2\ **Last updated:** [October 15, 2019, 12:54pm UTC](https://forums.kodeco.com/t/chapter-29-websockets/80685 "2019-10-15T12:54:20Z")
Really appreciate the book, I have been writing robust server side swift code backed by your unittest demos. However when I try to do TDD to implement chat component based on the websockets. I met some trouble: I have ā€¦ --- ## [Initial problems with Kitura tutorial dyld: Library not loaded:](https://forums.kodeco.com/t/initial-problems-with-kitura-tutorial-dyld-library-not-loaded/76069)
**Author:** [@greg\_s](https://forums.kodeco.com/u/greg_s)\ **Replies:** 5\ **Last updated:** [October 15, 2019, 7:02am UTC](https://forums.kodeco.com/t/initial-problems-with-kitura-tutorial-dyld-library-not-loaded/76069 "2019-10-15T07:02:35Z")
My Mac runs Mojave 10.14.5. with Xcode 10.2.1 and Swift 4.2. As I worked through the Kitura Tutorial: Getting Started With Server-Side Swift I got an error message after following the instructions (below) so I must be ā€¦ --- ## [UIViewRepresentable code does not work - Chapter 4](https://forums.kodeco.com/t/uiviewrepresentable-code-does-not-work-chapter-4/84337)
**Author:** [@createch](https://forums.kodeco.com/u/createch)\ **Replies:** 5\ **Last updated:** [October 15, 2019, 6:57am UTC](https://forums.kodeco.com/t/uiviewrepresentable-code-does-not-work-chapter-4/84337 "2019-10-15T06:57:26Z")
The UIViewRepresentable code does not work as outlined in Chapter 4. The binding give all sorts of errors. This is how I solved the problem and it is now working. I reference the ColorUISlider in the Coordinator by wā€¦ --- ## [Is ARKit By Tutorial still useable, or is there an update?](https://forums.kodeco.com/t/is-arkit-by-tutorial-still-useable-or-is-there-an-update/75297)
**Author:** [@zoran](https://forums.kodeco.com/u/zoran)\ **Replies:** 12\ **Last updated:** [October 15, 2019, 2:36am UTC](https://forums.kodeco.com/t/is-arkit-by-tutorial-still-useable-or-is-there-an-update/75297 "2019-10-15T02:36:01Z")
i am looking at buying the ARKit by Tutorial however it is for Swift 4.2. my current XCode swift version is 5 and I think ARKit is up to 3 now. will this book still work in relation to coding in it or is there a lot of dā€¦ --- ## [Chapter 1, page 32, xocde 10.3, mojavi(10.14.6(18G95)](https://forums.kodeco.com/t/chapter-1-page-32-xocde-10-3-mojavi-10-14-6-18g95/80831)
**Author:** [@hyegon](https://forums.kodeco.com/u/hyegon)\ **Replies:** 2\ **Last updated:** [October 15, 2019, 2:16am UTC](https://forums.kodeco.com/t/chapter-1-page-32-xocde-10-3-mojavi-10-14-6-18g95/80831 "2019-10-15T02:16:25Z")
cmd run ? lldb) po \[$rdi setHidden:!(BOOL)\[$rdi isHidden\]\]; \[CATransaction flush\] error: Execution was interrupted, reason: EXC\_BAD\_ACCESS (code=1, address=0xc0000000020). Solution?? --- ## [Coroutines no longer experimental](https://forums.kodeco.com/t/coroutines-no-longer-experimental/64099)
**Author:** [@tokyomike55](https://forums.kodeco.com/u/tokyomike55)\ **Replies:** 5\ **Last updated:** [October 15, 2019, 1:18am UTC](https://forums.kodeco.com/t/coroutines-no-longer-experimental/64099 "2019-10-15T01:18:15Z")
Hi guys, Your chapter on Coroutines appears to be outdated. With Kotlin 1.3, coroutines is no longer experimental and nothing in the book (starter / finish) is working. When will there be an update? --- ## [Any update for this book?](https://forums.kodeco.com/t/any-update-for-this-book/81826)
**Author:** [@yangwulong1978](https://forums.kodeco.com/u/yangwulong1978)\ **Replies:** 4\ **Last updated:** [October 15, 2019, 12:57am UTC](https://forums.kodeco.com/t/any-update-for-this-book/81826 "2019-10-15T00:57:04Z")
any update for this book? --- ## [Chapter 36 - Tmp image](https://forums.kodeco.com/t/chapter-36-tmp-image/82073)
**Author:** [@rlau8530](https://forums.kodeco.com/u/rlau8530)\ **Replies:** 1\ **Last updated:** [October 14, 2019, 11:21pm UTC](https://forums.kodeco.com/t/chapter-36-tmp-image/82073 "2019-10-14T23:21:15Z")
I am currently at chapter 36. When I scroll down the table and scroll up again, the previous loaded images have to be downloaded again. May I know how to keep those images until users kill the app? Many thanks! Rā€¦ --- ## [Help with internationalization in StoreSearch](https://forums.kodeco.com/t/help-with-internationalization-in-storesearch/82004)
**Author:** [@coder\_rgv7](https://forums.kodeco.com/u/coder_rgv7)\ **Replies:** 1\ **Last updated:** [October 14, 2019, 11:10pm UTC](https://forums.kodeco.com/t/help-with-internationalization-in-storesearch/82004 "2019-10-14T23:10:05Z")
Hi, Iā€™m currently doing StoreSearch from iOS Apprentice. Iā€™m on Chapter 41 (Internationalization) currently, and am on the part where the type property definition is changed to make it update based on Localizable.strings ā€¦ --- ## [17-working-with-blend-shapes final project](https://forums.kodeco.com/t/17-working-with-blend-shapes-final-project/81969)
**Author:** [@htaiwan](https://forums.kodeco.com/u/htaiwan)\ **Replies:** 1\ **Last updated:** [October 14, 2019, 11:02pm UTC](https://forums.kodeco.com/t/17-working-with-blend-shapes-final-project/81969 "2019-10-14T23:02:41Z")
I run the final project, and check the pig or woot button It doesnā€™t work. Is there anything I missed ?? --- ## [Change header section color when deleting the cell](https://forums.kodeco.com/t/change-header-section-color-when-deleting-the-cell/80274)
**Author:** [@mcneils](https://forums.kodeco.com/u/mcneils)\ **Replies:** 4\ **Last updated:** [October 14, 2019, 10:30pm UTC](https://forums.kodeco.com/t/change-header-section-color-when-deleting-the-cell/80274 "2019-10-14T22:30:53Z")
When deleting a cell in the location details view controller that will also remove the section header. There is a grey background-color that gets. Any tips on how to go about changing the color opacity to 0? --- ## [Sealed Classes Example](https://forums.kodeco.com/t/sealed-classes-example/84192)
**Author:** [@chuck\_taylor](https://forums.kodeco.com/u/chuck_taylor)\ **Replies:** 1\ **Last updated:** [October 14, 2019, 9:50pm UTC](https://forums.kodeco.com/t/sealed-classes-example/84192 "2019-10-14T21:50:32Z")
Iā€™m not understanding the example code found on page 238 Specifically, the code block under ā€œAnd functions defined on Shape can distinguish between the different subtypes using a when expression:ā€ fun size(shape: Shapeā€¦ --- ## [UseCase for private for the constructor that has a subclass](https://forums.kodeco.com/t/usecase-for-private-for-the-constructor-that-has-a-subclass/83292)
**Author:** [@pgudivada](https://forums.kodeco.com/u/pgudivada)\ **Replies:** 1\ **Last updated:** [October 14, 2019, 9:43pm UTC](https://forums.kodeco.com/t/usecase-for-private-for-the-constructor-that-has-a-subclass/83292 "2019-10-14T21:43:30Z")
On page 241 for the 2nd edition, super class User has a private member id. Subclass PrivilegedUser needs id. As id cannot be used within this subclass, does this kind of defining a private variable at the super class hā€¦ --- ## [\[Question\] how ? Or where should I run it? "(lldb) sys echo" $ (dclass -t swift) "| grep -v \_ | grep" \\. "| cut -d. f1 | uniq | wc -l (Page 28 Line 16)](https://forums.kodeco.com/t/question-how-or-where-should-i-run-it-lldb-sys-echo-dclass-t-swift-grep-v-grep-cut-d-f1-uniq-wc-l-page-28-line-16/80678)
**Author:** [@hyegon](https://forums.kodeco.com/u/hyegon)\ **Replies:** 2\ **Last updated:** [October 14, 2019, 9:04pm UTC](https://forums.kodeco.com/t/question-how-or-where-should-i-run-it-lldb-sys-echo-dclass-t-swift-grep-v-grep-cut-d-f1-uniq-wc-l-page-28-line-16/80678 "2019-10-14T21:04:11Z")
hi ā€¦! The following is part of the book. Page 28 ā€¦ Line 14 ~ ā€¦ !! When run from the following command lldb There is no sys command. how ? Or where should I run it? ā€œ(lldb) sys echoā€ $ (dclass -t swift) ā€œ| grep -v \_ā€¦ --- ## [ldb python script run?](https://forums.kodeco.com/t/ldb-python-script-run/80826)
**Author:** [@hyegon](https://forums.kodeco.com/u/hyegon)\ **Replies:** 2\ **Last updated:** [October 14, 2019, 9:03pm UTC](https://forums.kodeco.com/t/ldb-python-script-run/80826 "2019-10-14T21:03:08Z")
link: GitHub - DerekSelander/LLDB: A collection of LLDB aliases/regexes and Python scripts to aid in your debugging sessions Below is the execution result. (lldb) command script import ~ / Users / gimhyegon\_dev / lldb\_ā€¦ --- ## [Where to download the file and run the app?](https://forums.kodeco.com/t/where-to-download-the-file-and-run-the-app/80463)
**Author:** [@andrewpham74](https://forums.kodeco.com/u/andrewpham74)\ **Replies:** 8\ **Last updated:** [October 14, 2019, 8:46pm UTC](https://forums.kodeco.com/t/where-to-download-the-file-and-run-the-app/80463 "2019-10-14T20:46:30Z")
Hi, I just finished reading the book to have an idea of the overall picture. Even though I am still new too Swift development, I has been able to get the local notification to work. As a continuation, I would like to geā€¦ --- ## [Tutorial 3 MyLocations page 220 ' exercise](https://forums.kodeco.com/t/tutorial-3-mylocations-page-220-exercise/12028)
**Author:** [@iosgeek](https://forums.kodeco.com/u/iosgeek)\ **Replies:** 14\ **Last updated:** [October 14, 2019, 8:43pm UTC](https://forums.kodeco.com/t/tutorial-3-mylocations-page-220-exercise/12028 "2019-10-14T20:43:28Z")
Whatā€™s the solution? Thanks in advance --- ## [Issue chapter 15](https://forums.kodeco.com/t/issue-chapter-15/80647)
**Author:** [@lac\_ekim](https://forums.kodeco.com/u/lac_ekim)\ **Replies:** 5\ **Last updated:** [October 14, 2019, 7:43pm UTC](https://forums.kodeco.com/t/issue-chapter-15/80647 "2019-10-14T19:43:14Z")
ā€œOpen a new Finder window by clicking on the Desktop and typing āŒ˜+N (or, by clicking the Finder icon in your dock, if you have one.). Then press āŒ˜+Shift+G (or, select Go ā†’ Go to Folderā€¦ from the menu), copy the Documentsā€¦ --- ## [Core Data and CloudKit](https://forums.kodeco.com/t/core-data-and-cloudkit/25482)
**Author:** [@createch](https://forums.kodeco.com/u/createch)\ **Replies:** 10\ **Last updated:** [October 14, 2019, 4:09pm UTC](https://forums.kodeco.com/t/core-data-and-cloudkit/25482 "2019-10-14T16:09:42Z")
I would really love to see a section on Core Data \<-\> CloudKit synchronization. This is something that I think many would find extremely useful. I want to build an iOS and a MacOS app that synchronizes data across deviā€¦ --- ## [Setting up certificates](https://forums.kodeco.com/t/setting-up-certificates/84864)
**Author:** [@jblakeharris](https://forums.kodeco.com/u/jblakeharris)\ **Replies:** 1\ **Last updated:** [October 14, 2019, 3:04pm UTC](https://forums.kodeco.com/t/setting-up-certificates/84864 "2019-10-14T15:04:43Z")
Something that has likely changed at Apple recently makes Chapter 13 a bit misleadingā€¦ you cannot register a new app with maccatalyst.com.\[ā€¦\]. Per an Apple dev forum, the certificate is now generated via editing the iOS ā€¦ --- ## [Dependency Maps](https://forums.kodeco.com/t/dependency-maps/73984)
**Author:** [@ashitikov](https://forums.kodeco.com/u/ashitikov)\ **Replies:** 2\ **Last updated:** [October 10, 2019, 1:29pm UTC](https://forums.kodeco.com/t/dependency-maps/73984 "2019-10-10T13:29:25Z")
Hello, you announced that in chapter 13 there will be an instrument ā€œDependency mapsā€. Can you give some more details? Do you plan to use existing tool on market or you will show instrument created by your team? --- ## [Errors and crashes with final project in Chapter 17-Presentation Controller & Orientation Animations](https://forums.kodeco.com/t/errors-and-crashes-with-final-project-in-chapter-17-presentation-controller-orientation-animations/83542)
**Author:** [@jmclovin](https://forums.kodeco.com/u/jmclovin)\ **Replies:** 5\ **Last updated:** [October 10, 2019, 9:03am UTC](https://forums.kodeco.com/t/errors-and-crashes-with-final-project-in-chapter-17-presentation-controller-orientation-animations/83542 "2019-10-10T09:03:28Z")
I just downloaded the latest files for iOS Animations by Tutorials and have run into the following issues: On first run, it crashes on line 93 of ViewController.swift: let imageView = listView.viewWithTag(i) as! UIImaā€¦ --- ## [Errata for iOS Animations by Tutorials, 6th Edition](https://forums.kodeco.com/t/errata-for-ios-animations-by-tutorials-6th-edition/83652)
**Author:** [@chrisrazeware](https://forums.kodeco.com/u/chrisrazeware)\ **Replies:** 4\ **Last updated:** [October 10, 2019, 9:03am UTC](https://forums.kodeco.com/t/errata-for-ios-animations-by-tutorials-6th-edition/83652 "2019-10-10T09:03:09Z")
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