# šŸ“š Official Books **URL:** https://forums.kodeco.com/c/books/6.md?page=80 [Latest](https://forums.kodeco.com/latest.md) Ā· [Categories](https://forums.kodeco.com/categories.md) Ā· [Tags](https://forums.kodeco.com/tags.md) **Page:** 81 --- ## [Chapters 9-20 in iOS Apprentice Early Access](https://forums.kodeco.com/t/chapters-9-20-in-ios-apprentice-early-access/86959)
**Author:** [@steveb\_la](https://forums.kodeco.com/u/steveb_la)\ **Replies:** 2\ **Last updated:** [January 12, 2020, 7:05pm UTC](https://forums.kodeco.com/t/chapters-9-20-in-ios-apprentice-early-access/86959 "2020-01-12T19:05:12Z")
When can I expect Chapters 9 - 20 in the iOS\_Early\_Access\_v8.0.0 written up in the .pdf? Iā€™ve worked thru earlier versions on an older iMac. I now have a new Macbook-Pro and would really like to move forward. Iā€™ve gotā€¦ --- ## [8th Edition: Understanding the SwiftUI Helper Code](https://forums.kodeco.com/t/8th-edition-understanding-the-swiftui-helper-code/80375)
**Author:** [@rwenderlich](https://forums.kodeco.com/u/rwenderlich)\ **Replies:** 2\ **Last updated:** [January 12, 2020, 4:23pm UTC](https://forums.kodeco.com/t/8th-edition-understanding-the-swiftui-helper-code/80375 "2020-01-12T16:23:18Z")
In the upcoming iOS Apprentice 8th Edition, we are including some SwiftUI helper code in section 2, to make it easier to understand for beginners. Soon, we will be including a detailed explanation of how it works here, ā€¦ --- ## [Coordinator Pattern (c. 23): Multiple styles of navigation within a coordinator](https://forums.kodeco.com/t/coordinator-pattern-c-23-multiple-styles-of-navigation-within-a-coordinator/87329)
**Author:** [@alekplay](https://forums.kodeco.com/u/alekplay)\ **Replies:** 2\ **Last updated:** [January 12, 2020, 6:45am UTC](https://forums.kodeco.com/t/coordinator-pattern-c-23-multiple-styles-of-navigation-within-a-coordinator/87329 "2020-01-12T06:45:23Z")
In the Coordinator Pattern introduced in Chapter 23 of Design Patterns by Tutorials we specify that the specific Coordinator only knows the order of view controllers but not how to present them, and vice versa for the spā€¦ --- ## [Chapter 8 unchecked cast warning](https://forums.kodeco.com/t/chapter-8-unchecked-cast-warning/89778)
**Author:** [@acix](https://forums.kodeco.com/u/acix)\ **Replies:** 1\ **Last updated:** [January 12, 2020, 2:26am UTC](https://forums.kodeco.com/t/chapter-8-unchecked-cast-warning/89778 "2020-01-12T02:26:49Z")
Hi, The readLists function in ListDataManager (chapter 8) causes a ā€œUnchecked cast Any? to kotlin.collections.HashSetā€ warning in: val itemsHashSet = ArrayList(taskList.value as HashSet) What is the best way to deal ā€¦ --- ## [Realm Compiled Error in Xcode 11](https://forums.kodeco.com/t/realm-compiled-error-in-xcode-11/89649)
**Author:** [@lmw41](https://forums.kodeco.com/u/lmw41)\ **Replies:** 2\ **Last updated:** [January 12, 2020, 1:58am UTC](https://forums.kodeco.com/t/realm-compiled-error-in-xcode-11/89649 "2020-01-12T01:58:38Z")
After running final version of the example, Xcode shows the compiled error as below \*\*\*\*\* Terminating app due to uncaught exception ā€˜RLMExceptionā€™, reason: ā€˜Primary key property ā€˜idā€™ does not exist on object ā€˜ToDoItemā€™ā€™ā€¦ --- ## [Chapter 2 Compiled Error](https://forums.kodeco.com/t/chapter-2-compiled-error/89447)
**Author:** [@lmw41](https://forums.kodeco.com/u/lmw41)\ **Replies:** 3\ **Last updated:** [January 12, 2020, 1:49am UTC](https://forums.kodeco.com/t/chapter-2-compiled-error/89447 "2020-01-12T01:49:12Z")
After running final version of the example, Xcode shows the compiled error as below \*\*\*\*\* Terminating app due to uncaught exception ā€˜RLMExceptionā€™, reason: ā€˜Primary key property ā€˜idā€™ does not exist on object ā€˜ToDoItemā€™ā€™ā€¦ --- ## [Heads up if you are on macOS Catalina -- bash is no longer the default](https://forums.kodeco.com/t/heads-up-if-you-are-on-macos-catalina-bash-is-no-longer-the-default/93701)
**Author:** [@cupofjoe](https://forums.kodeco.com/u/cupofjoe)\ **Replies:** 2\ **Last updated:** [January 12, 2020, 1:34am UTC](https://forums.kodeco.com/t/heads-up-if-you-are-on-macos-catalina-bash-is-no-longer-the-default/93701 "2020-01-12T01:34:23Z")
Not sure if this is my problem yet but when the author wrote this book, which is very good by the way, the default shell of OS X was forever and always ā€˜bashā€™. The default shell for any user account in macOS Catalina 10ā€¦ --- ## [Challenge 1: height of binary tree](https://forums.kodeco.com/t/challenge-1-height-of-binary-tree/85536)
**Author:** [@sahsubodh](https://forums.kodeco.com/u/sahsubodh)\ **Replies:** 4\ **Last updated:** [January 12, 2020, 1:02am UTC](https://forums.kodeco.com/t/challenge-1-height-of-binary-tree/85536 "2020-01-12T01:02:48Z")
Can someone please tell me why does the base case has value -1 ? shouldnt it be 0? guard let node = node else{ return -1; } --- ## [Query about the MVP pattern (Chapter 8 - AAAA)](https://forums.kodeco.com/t/query-about-the-mvp-pattern-chapter-8-aaaa/89314)
**Author:** [@imrhk](https://forums.kodeco.com/u/imrhk)\ **Replies:** 1\ **Last updated:** [January 12, 2020, 12:29am UTC](https://forums.kodeco.com/t/query-about-the-mvp-pattern-chapter-8-aaaa/89314 "2020-01-12T00:29:41Z")
In the chapter MVP, in MainPresenter.kt, it is written val observer: DisposableObserver\\> get() = object : DisposableObserver\\>() but this means that each get call to observer will create newā€¦ --- ## [How to catch sqlite error](https://forums.kodeco.com/t/how-to-catch-sqlite-error/89235)
**Author:** [@mannguyen](https://forums.kodeco.com/u/mannguyen)\ **Replies:** 7\ **Last updated:** [January 11, 2020, 11:41pm UTC](https://forums.kodeco.com/t/how-to-catch-sqlite-error/89235 "2020-01-11T23:41:40Z")
I added a miragation prepare to make one of my data field unique but i want to catch that error so I can redirect user or show them error alert on my website instead of letting vapor to handle the error showing part --- ## [Chapter 5 - No such module 'Game'](https://forums.kodeco.com/t/chapter-5-no-such-module-game/87759)
**Author:** [@hyegon](https://forums.kodeco.com/u/hyegon)\ **Replies:** 8\ **Last updated:** [January 11, 2020, 11:24pm UTC](https://forums.kodeco.com/t/chapter-5-no-such-module-game/87759 "2020-01-11T23:24:30Z")
HI ā€¦! In my project I get the following error: Error list: BullsEyePlus Group Swift Compiler Error Group /BullsEyePlus/BullsEyePlus/ContentView.swift:33:38: Use of unresolved identifier ā€˜BullsEyeGameā€™ BullsEyePlus ā€¦ --- ## [Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-\[UnCloudNotes.Attachment copyWithZone:\]: unrecognized selector sent to instance 0x60000280fac0'](https://forums.kodeco.com/t/terminating-app-due-to-uncaught-exception-nsinvalidargumentexception-reason-uncloudnotes-attachment-copywithzone-unrecognized-selector-sent-to-instance-0x60000280fac0/88654)
**Author:** [@alexyz](https://forums.kodeco.com/u/alexyz)\ **Replies:** 2\ **Last updated:** [January 11, 2020, 9:37pm UTC](https://forums.kodeco.com/t/terminating-app-due-to-uncaught-exception-nsinvalidargumentexception-reason-uncloudnotes-attachment-copywithzone-unrecognized-selector-sent-to-instance-0x60000280fac0/88654 "2020-01-11T21:37:50Z")
Hi. I am trying to build the UnCloudNotes app after making the changes in v2 to v3 in chapter 6. I am getting the following traceback: 2019-11-19 19:10:07.317193-0800 UnCloudNotes\[6010:557927\] -\[UnCloudNotes.Attachment ā€¦ --- ## [Tableview rotation error](https://forums.kodeco.com/t/tableview-rotation-error/88567)
**Author:** [@zoran](https://forums.kodeco.com/u/zoran)\ **Replies:** 2\ **Last updated:** [January 11, 2020, 9:30pm UTC](https://forums.kodeco.com/t/tableview-rotation-error/88567 "2020-01-11T21:30:14Z")
Iā€™m currently doing the StoreSearch tutorial and as of lat it keeps crashing due to following errorā€¦ 2019-11-19 18:11:32.056113+1000 StoreSearch\[3317:436206\] \[Window\] Manually adding the rootViewControllerā€™s view to theā€¦ --- ## [Get error when run the command "swift build -c release" on ubuntu18.04](https://forums.kodeco.com/t/get-error-when-run-the-command-swift-build-c-release-on-ubuntu18-04/88200)
**Author:** [@thammaporn](https://forums.kodeco.com/u/thammaporn)\ **Replies:** 4\ **Last updated:** [January 11, 2020, 8:42pm UTC](https://forums.kodeco.com/t/get-error-when-run-the-command-swift-build-c-release-on-ubuntu18-04/88200 "2020-01-11T20:42:47Z")
I got the error message after run the command ā€œswift build -c releaseā€ as below. /usr/share/swift/usr/bin/swift-build: /usr/lib/x86\_64-linux-gnu/libcurl.so.4: version \`CURL\_OPENSSL\_4ā€™ not found (required by /usr/share/sā€¦ --- ## [Question about the MVVM pattern, Chapter 12](https://forums.kodeco.com/t/question-about-the-mvvm-pattern-chapter-12/88215)
**Author:** [@cylon](https://forums.kodeco.com/u/cylon)\ **Replies:** 1\ **Last updated:** [January 11, 2020, 8:17pm UTC](https://forums.kodeco.com/t/question-about-the-mvvm-pattern-chapter-12/88215 "2020-01-11T20:17:37Z")
Dear Friends, please excuse my not very good English, I hope you understand my question. Iā€™m having a little trouble understanding how the View (Fragment or Activity) should really interact with the ViewModel. For exampā€¦ --- ## [Editing notes for next version](https://forums.kodeco.com/t/editing-notes-for-next-version/87812)
**Author:** [@rcritz](https://forums.kodeco.com/u/rcritz)\ **Replies:** 1\ **Last updated:** [January 11, 2020, 7:06pm UTC](https://forums.kodeco.com/t/editing-notes-for-next-version/87812 "2020-01-11T19:06:52Z")
References to other chapters are formatted incorrectly. See the English Style Guide for correct formatting. A number of fenced code sections arenā€™t wrapping properly. --- ## [Making the headers of a static table view controller tappable](https://forums.kodeco.com/t/making-the-headers-of-a-static-table-view-controller-tappable/87801)
**Author:** [@mikeneirinck](https://forums.kodeco.com/u/mikeneirinck)\ **Replies:** 1\ **Last updated:** [January 11, 2020, 7:05pm UTC](https://forums.kodeco.com/t/making-the-headers-of-a-static-table-view-controller-tappable/87801 "2020-01-11T19:05:45Z")
Hi I have a static view table view controller. This has sections and it rows. When I tap on the header of a section I want it to collapse. I thought of adding a tap gesture recognizer to it but I can not find a way to cā€¦ --- ## [RxSwift v3.0 Errata](https://forums.kodeco.com/t/rxswift-v3-0-errata/87761)
**Author:** [@culjakj](https://forums.kodeco.com/u/culjakj)\ **Replies:** 1\ **Last updated:** [January 11, 2020, 7:02pm UTC](https://forums.kodeco.com/t/rxswift-v3-0-errata/87761 "2020-01-11T19:02:46Z")
remembver ā†’ remember (p.265) overhelmed ā†’ overwhelmed (p.267) Cheers! --- ## [\[CatNap, Chapter 9\] The physics body of the bed doesn't show](https://forums.kodeco.com/t/catnap-chapter-9-the-physics-body-of-the-bed-doesnt-show/29183)
**Author:** [@qiao\_zhang](https://forums.kodeco.com/u/qiao_zhang)\ **Replies:** 3\ **Last updated:** [January 11, 2020, 6:50pm UTC](https://forums.kodeco.com/t/catnap-chapter-9-the-physics-body-of-the-bed-doesnt-show/29183 "2020-01-11T18:50:39Z")
Hi, everyone. As said in the title, after I added a physics body to the bed node and set the view to show physics, there was no green box shown on simulator and the wooden block that was supposed to be pushed aside was iā€¦ --- ## [Possible solution to challenge: Calculating the tile grid (p. 997, chapter 50)](https://forums.kodeco.com/t/possible-solution-to-challenge-calculating-the-tile-grid-p-997-chapter-50/87599)
**Author:** [@danielmey](https://forums.kodeco.com/u/danielmey)\ **Replies:** 1\ **Last updated:** [January 11, 2020, 6:34pm UTC](https://forums.kodeco.com/t/possible-solution-to-challenge-calculating-the-tile-grid-p-997-chapter-50/87599 "2020-01-11T18:34:23Z")
I tried my hand at the challenge proposed in the ā€œLandscapeā€ chapter 50 on p. 997 (page 988 and chapter 39 old version). The challenge was to avoid hard coding the values of the item height and width as well as the margiā€¦ --- ## [Chapter 8 Challenge #1](https://forums.kodeco.com/t/chapter-8-challenge-1/87526)
**Author:** [@vale\_cocoa](https://forums.kodeco.com/u/vale_cocoa)\ **Replies:** 1\ **Last updated:** [January 11, 2020, 6:04pm UTC](https://forums.kodeco.com/t/chapter-8-challenge-1/87526 "2020-01-11T18:04:22Z")
I was able to have this sort of working with this code: newPhotos .ignoreOutput() .filter { \[unowned self\] \_ in self.images.value.count == 6 } .sink(receiveCompletion: { \[unowned self\] \_ in ā€¦ --- ## [How can I get iOS apprentice Seventh edition?](https://forums.kodeco.com/t/how-can-i-get-ios-apprentice-seventh-edition/86980)
**Author:** [@superkookai](https://forums.kodeco.com/u/superkookai)\ **Replies:** 1\ **Last updated:** [January 11, 2020, 4:23pm UTC](https://forums.kodeco.com/t/how-can-i-get-ios-apprentice-seventh-edition/86980 "2020-01-11T16:23:26Z")
Hi: I bought iOS apprentice Sixth edition but would like to get pdf/ePub of Seventh edition for study all UIKit in the book, how can I get those edition of the book?? (In the web site now only early update of Eighth editā€¦ --- ## [Missing information](https://forums.kodeco.com/t/missing-information/86946)
**Author:** [@game\_gecko](https://forums.kodeco.com/u/game_gecko)\ **Replies:** 1\ **Last updated:** [January 11, 2020, 4:12pm UTC](https://forums.kodeco.com/t/missing-information/86946 "2020-01-11T16:12:43Z")
I thought I post this since it is not included in the book, but IN Chapter 5: Camera, Page 129, it doesnā€™t mention in GameScene.swift to comment out debugDrawPlayableArea() in the didMove function and boundsCheckZombieā€¦ --- ## [Zombie Game Over Scene mistake](https://forums.kodeco.com/t/zombie-game-over-scene-mistake/86944)
**Author:** [@game\_gecko](https://forums.kodeco.com/u/game_gecko)\ **Replies:** 1\ **Last updated:** [January 11, 2020, 3:59pm UTC](https://forums.kodeco.com/t/zombie-game-over-scene-mistake/86944 "2020-01-11T15:59:45Z")
In the book you make the zombie lose a life every time he collides with the granny ā€œlives -= 1ā€ .It is put in func zombieHit(enemy: SKSpirteNode) after loseCats(). It is supposed to be put above the ā€œlet blinkTimesā€ consā€¦ --- ## [Chapter 8 " Add a last-modified header to the request"](https://forums.kodeco.com/t/chapter-8-add-a-last-modified-header-to-the-request/86804)
**Author:** [@mike](https://forums.kodeco.com/u/mike)\ **Replies:** 2\ **Last updated:** [January 11, 2020, 3:55pm UTC](https://forums.kodeco.com/t/chapter-8-add-a-last-modified-header-to-the-request/86804 "2020-01-11T15:55:10Z")
After the new Relay created: ā€œprivate let lastModified = BehaviorRelay\(value: nil)ā€ , then accept() was called two times: ā€œif let lastModifiedString = try? String(contentsOf: modifiedFileURL, encoding: .utf8)ā€¦ --- ## [Problem with tuples](https://forums.kodeco.com/t/problem-with-tuples/26333)
**Author:** [@jaclawiciel](https://forums.kodeco.com/u/jaclawiciel)\ **Replies:** 3\ **Last updated:** [January 11, 2020, 3:47pm UTC](https://forums.kodeco.com/t/problem-with-tuples/26333 "2020-01-11T15:47:41Z")
I practice tuples mini-exercises in Chapter 3 about types and operations. I donā€™t think that it should behave like that but if I make a mistake somewhere please correct me. When I declare a tuple like so: let dateWitā€¦ --- ## [Use of undeclared type 'CGFLoat'](https://forums.kodeco.com/t/use-of-undeclared-type-cgfloat/86770)
**Author:** [@game\_gecko](https://forums.kodeco.com/u/game_gecko)\ **Replies:** 1\ **Last updated:** [January 11, 2020, 3:21pm UTC](https://forums.kodeco.com/t/use-of-undeclared-type-cgfloat/86770 "2020-01-11T15:21:05Z")
when I try to build the game(page 97), I get the error in MyUtils.swift, Use of undeclared type ā€˜CGFLoatā€™ from this code: extension CGFloat { static func random() ā†’ CGFloat { return CGFloat(Float(arc4random()) / Floatā€¦ --- ## [Error - Does not conform 'Parameter'](https://forums.kodeco.com/t/error-does-not-conform-parameter/94232)
**Author:** [@anan](https://forums.kodeco.com/u/anan)\ **Replies:** 2\ **Last updated:** [January 11, 2020, 12:42pm UTC](https://forums.kodeco.com/t/error-does-not-conform-parameter/94232 "2020-01-11T12:42:58Z")
Hi anyone knows about this issue and how to resolve it? Thank you :blush: --- ## [Not works savings in Section 2: Checklists](https://forums.kodeco.com/t/not-works-savings-in-section-2-checklists/92459)
**Author:** [@ucelme](https://forums.kodeco.com/u/ucelme)\ **Replies:** 1\ **Last updated:** [January 8, 2020, 3:25am UTC](https://forums.kodeco.com/t/not-works-savings-in-section-2-checklists/92459 "2020-01-08T03:25:36Z")
I made all steps from the book and also downloaded final project Checklists, but it doesnā€™t work saving data in either cases. How I can fix saving feature to Checklists? --- ## [Import KituraOpenAPI doesn't work \[Chapter 6\]](https://forums.kodeco.com/t/import-kituraopenapi-doesnt-work-chapter-6/93723)
**Author:** [@danjanes](https://forums.kodeco.com/u/danjanes)\ **Replies:** 2\ **Last updated:** [January 8, 2020, 2:13am UTC](https://forums.kodeco.com/t/import-kituraopenapi-doesnt-work-chapter-6/93723 "2020-01-08T02:13:58Z")
Any idea about importing KituraOpenAPI? Iā€™ve even tracked the siteā€™s release notes: Kitura-OpenAPI/README.md at master Ā· Kitura/Kitura-OpenAPI Ā· GitHub I get this error message: ā€œNo such module ā€˜KituraOpenAPI.ā€™ā€ Any iā€¦ [Previous page](https://forums.kodeco.com/c/books/6.md?page=79) [Next page](https://forums.kodeco.com/c/books/6.md?page=81)