# šŸ“š Official Books **URL:** https://forums.kodeco.com/c/books/6.md?page=119 [Latest](https://forums.kodeco.com/latest.md) Ā· [Categories](https://forums.kodeco.com/categories.md) Ā· [Tags](https://forums.kodeco.com/tags.md) **Page:** 120 --- ## ["Hero" run animation will not work - Chap 4 - Solved by copying end of chapter files](https://forums.kodeco.com/t/hero-run-animation-will-not-work-chap-4-solved-by-copying-end-of-chapter-files/43560)
**Author:** [@buzzliteyr2018](https://forums.kodeco.com/u/buzzliteyr2018)\ **Replies:** 2\ **Last updated:** [June 15, 2018, 10:34am UTC](https://forums.kodeco.com/t/hero-run-animation-will-not-work-chap-4-solved-by-copying-end-of-chapter-files/43560 "2018-06-15T10:34:34Z")
Hi there, Working through Chap 4 (pages 129-135) and I canā€™t figure out why my running animation does not want to work. Itā€™s not the animation itself, since if I set the ā€œrunā€ in the ā€œwalkā€ or ā€œidleā€ state, the charactā€¦ --- ## [Chapter 16 - 'Done' Button never active](https://forums.kodeco.com/t/chapter-16-done-button-never-active/43605)
**Author:** [@zubes](https://forums.kodeco.com/u/zubes)\ **Replies:** 2\ **Last updated:** [June 15, 2018, 1:33am UTC](https://forums.kodeco.com/t/chapter-16-done-button-never-active/43605 "2018-06-15T01:33:31Z")
So I just completed Chapter 16 and when i run the simulator the ā€˜Doneā€™ button on the add a checklist is never active. Iā€™ve cross compared my code with the final code and Iā€™ve checked my connections and it is indeed conneā€¦ --- ## [Errata for Chapter 2](https://forums.kodeco.com/t/errata-for-chapter-2/43531)
**Author:** [@victorsmelo](https://forums.kodeco.com/u/victorsmelo)\ **Replies:** 3\ **Last updated:** [June 14, 2018, 2:07pm UTC](https://forums.kodeco.com/t/errata-for-chapter-2/43531 "2018-06-14T14:07:52Z")
Hey guys! Thanks for the book. I am starting learning Vapor now, and I couldnā€™t find easiest content on internet than the Vapor Book you are developing. Itā€™s awesome! I am reading the Chapter 2, and I found the situatioā€¦ --- ## [Writing 3D content creation tools in Metal](https://forums.kodeco.com/t/writing-3d-content-creation-tools-in-metal/43515)
**Author:** [@kikiwunder](https://forums.kodeco.com/u/kikiwunder)\ **Replies:** 1\ **Last updated:** [June 14, 2018, 3:14am UTC](https://forums.kodeco.com/t/writing-3d-content-creation-tools-in-metal/43515 "2018-06-14T03:14:44Z")
Hi there! Really enjoying the book so far. I was wondering: Will part of a later tutorial involve camera control? Manipulation? Iā€™d really love to make content creation tools using Metal and to have more of a groundinā€¦ --- ## [Animations paused by default?](https://forums.kodeco.com/t/animations-paused-by-default/42768)
**Author:** [@chemajuarez](https://forums.kodeco.com/u/chemajuarez)\ **Replies:** 3\ **Last updated:** [June 12, 2018, 4:47am UTC](https://forums.kodeco.com/t/animations-paused-by-default/42768 "2018-06-12T04:47:43Z")
Hi, in my project all the animations created in the sks files are paused by default at the beginning. If I programmatically set the property of this objects isPaused as true, works. But itā€™s annoying and in the examplesā€¦ --- ## [UIView.animate() within a loop](https://forums.kodeco.com/t/uiview-animate-within-a-loop/43017)
**Author:** [@u3qu3oxyvflx](https://forums.kodeco.com/u/u3qu3oxyvflx)\ **Replies:** 3\ **Last updated:** [June 11, 2018, 3:21am UTC](https://forums.kodeco.com/t/uiview-animate-within-a-loop/43017 "2018-06-11T03:21:02Z")
I have an outlet collection. I want to animate changing their properties. Is it reasonable to put a animation within a loop? for outlet in outletCollection { UIView.animate(withDuration: 0.5, .... animatiā€¦ --- ## [Header WenderLoonCore not found](https://forums.kodeco.com/t/header-wenderlooncore-not-found/20395)
**Author:** [@frijswijk](https://forums.kodeco.com/u/frijswijk)\ **Replies:** 1\ **Last updated:** [June 11, 2018, 2:43am UTC](https://forums.kodeco.com/t/header-wenderlooncore-not-found/20395 "2018-06-11T02:43:41Z")
Header ā€˜WenderLoonCore-Swift.hā€™ not found and no such module in LoonUIExtension if I want to build the project. --- ## [The Strange behavior for Chapter 21's Challenge : Additive animations](https://forums.kodeco.com/t/the-strange-behavior-for-chapter-21s-challenge-additive-animations/41351)
**Author:** [@hopy](https://forums.kodeco.com/u/hopy)\ **Replies:** 1\ **Last updated:** [June 11, 2018, 2:15am UTC](https://forums.kodeco.com/t/the-strange-behavior-for-chapter-21s-challenge-additive-animations/41351 "2018-06-11T02:15:03Z")
hi guys I run App from answer for chapter 21ā€™s challenges project (My configuration : Xcode 9.2,OS X 10.2.6) in Simulator(not try at real device),when I quickly switch tap "show more " and ā€œshow lessā€ button,Itā€™s appearā€¦ --- ## [IOS Apprentice V6 - Bullseye - pg 46 - doesn't like "present("](https://forums.kodeco.com/t/ios-apprentice-v6-bullseye-pg-46-doesnt-like-present/43343)
**Author:** [@steveb\_la](https://forums.kodeco.com/u/steveb_la)\ **Replies:** 5\ **Last updated:** [June 11, 2018, 2:06am UTC](https://forums.kodeco.com/t/ios-apprentice-v6-bullseye-pg-46-doesnt-like-present/43343 "2018-06-11T02:06:12Z")
Yes, Iā€™m behind is going thru this tutorial. Could someone point me to an errata for this book? Or point me to the latest tutorial? Thanks so much, Steve --- ## [Chapter 7: let convert, page 186](https://forums.kodeco.com/t/chapter-7-let-convert-page-186/39201)
**Author:** [@dfrobison](https://forums.kodeco.com/u/dfrobison)\ **Replies:** 1\ **Last updated:** [June 11, 2018, 1:50am UTC](https://forums.kodeco.com/t/chapter-7-let-convert-page-186/39201 "2018-06-11T01:50:17Z")
The code needs to be updated from: let convert: \[String: UInt\] = \[ "abc": 2, "def": 3, "ghi": 4, "jkl": 5, "mno": 6, "pqrs": 7, "tuv": 8, "wxyz": 9 \] to: let keyMap: \[String: UInt\] = \[ "abc": 2, "defā€¦ --- ## [Books/video subscription](https://forums.kodeco.com/t/books-video-subscription/43371)
**Author:** [@chakri](https://forums.kodeco.com/u/chakri)\ **Replies:** 4\ **Last updated:** [June 10, 2018, 9:03pm UTC](https://forums.kodeco.com/t/books-video-subscription/43371 "2018-06-10T21:03:09Z")
I am thinking, video courses will cover all topics covered in books. So I am thinking video subscription is better option for Raywenderlich site, rather than buying books. Any suggestions? Thanks in advance! --- ## [Full Solution for Chapter 18 (Swift Apprentice, V3), Challenge 3 - Character Battle](https://forums.kodeco.com/t/full-solution-for-chapter-18-swift-apprentice-v3-challenge-3-character-battle/43432)
**Author:** [@neptunenancy](https://forums.kodeco.com/u/neptunenancy)\ **Replies:** 2\ **Last updated:** [June 9, 2018, 8:51pm UTC](https://forums.kodeco.com/t/full-solution-for-chapter-18-swift-apprentice-v3-challenge-3-character-battle/43432 "2018-06-09T20:51:01Z")
Iā€™m trying to code the solution for Challenge 3, Character Battle, but Iā€™m stuck! Unfortunately the playground that came with the book doesnā€™t include the solution, just the test cases that are already shown in the bookā€¦ --- ## [Answers to the mini exercises and challenges](https://forums.kodeco.com/t/answers-to-the-mini-exercises-and-challenges/20910)
**Author:** [@j\_k\_nash](https://forums.kodeco.com/u/j_k_nash)\ **Replies:** 6\ **Last updated:** [June 9, 2018, 4:56am UTC](https://forums.kodeco.com/t/answers-to-the-mini-exercises-and-challenges/20910 "2018-06-09T04:56:56Z")
I know a lot of the mini exercises are easy to do but where can i find the answers to them and the challengesā€¦ --- ## [Correction in Authentication chapter](https://forums.kodeco.com/t/correction-in-authentication-chapter/43400)
**Author:** [@eric\_wvgg](https://forums.kodeco.com/u/eric_wvgg)\ **Replies:** 3\ **Last updated:** [June 9, 2018, 12:30am UTC](https://forums.kodeco.com/t/correction-in-authentication-chapter/43400 "2018-06-09T00:30:04Z")
on page 247, the reader is instructed to ā€œimport Cryptoā€, but Crypto has not been added to Package.swift yet later on page 253, the reader is instructed to add the Authentication library to Package.swift, but still leavā€¦ --- ## [BatmansDelegate :: Beginner Tutorial focused solely on the Delegate Pattern - Batman Style!](https://forums.kodeco.com/t/batmansdelegate-beginner-tutorial-focused-solely-on-the-delegate-pattern-batman-style/43189)
**Author:** [@h1i2j3](https://forums.kodeco.com/u/h1i2j3)\ **Replies:** 11\ **Last updated:** [June 8, 2018, 11:18am UTC](https://forums.kodeco.com/t/batmansdelegate-beginner-tutorial-focused-solely-on-the-delegate-pattern-batman-style/43189 "2018-06-08T11:18:35Z")
ā–¶ TL;DR BatmansDelegate :: Beginner Tutorial Exploring the Delegate Pattern :: Part I Batman and his Delegate, Alfred Tutorial Time: 5-8 minutes. Actual time may vary based on InterfaceBuilder/Storyboard proficiency. ā€¦ --- ## [Chap16 List Default Identifier for UItableViewCell](https://forums.kodeco.com/t/chap16-list-default-identifier-for-uitableviewcell/43373)
**Author:** [@ceoit](https://forums.kodeco.com/u/ceoit)\ **Replies:** 3\ **Last updated:** [June 8, 2018, 5:56am UTC](https://forums.kodeco.com/t/chap16-list-default-identifier-for-uitableviewcell/43373 "2018-06-08T05:56:13Z")
func makeCell(for tableView: UITableView) -\> UITableViewCell { let cellIndentifier = "Cell" if let cell = tableView.dequeueReusableCell(withIdentifier: cellIndentifier) { return cell } else { return UITableViewCell(sā€¦ --- ## [Chapter 9, no userID](https://forums.kodeco.com/t/chapter-9-no-userid/42967)
**Author:** [@burstrom](https://forums.kodeco.com/u/burstrom)\ **Replies:** 4\ **Last updated:** [June 7, 2018, 7:48pm UTC](https://forums.kodeco.com/t/chapter-9-no-userid/42967 "2018-06-07T19:48:24Z")
Iā€™m not sure if reverting is the problem but when I run it I only get the output: $ vapor cloud run ā€œrevert --all --yes --appā€ app: Things I Learned env: production Running ā€˜.build/release/Run --env=production revertā€¦ --- ## [Recursively mean?](https://forums.kodeco.com/t/recursively-mean/43228)
**Author:** [@maomao](https://forums.kodeco.com/u/maomao)\ **Replies:** 1\ **Last updated:** [June 4, 2018, 9:56pm UTC](https://forums.kodeco.com/t/recursively-mean/43228 "2018-06-04T21:56:56Z")
ā€œ diceNodes.append(diceScene.rootNode.childNode( withName: ā€œdice(count)ā€, recursively: false)!) }ā€ I have no ideas what this mean --- ## [Concat operator](https://forums.kodeco.com/t/concat-operator/43190)
**Author:** [@cuong1112035](https://forums.kodeco.com/u/cuong1112035)\ **Replies:** 0\ **Last updated:** [June 3, 2018, 4:45am UTC](https://forums.kodeco.com/t/concat-operator/43190 "2018-06-03T04:45:49Z")
Hi all I have some code like this: let first = Observable\.create({ observer -\> Disposable in observer.onNext(1) return Disposables.create() }) let second = Observable.of(4, 5, 6) let oā€¦ --- ## [Page 462 showDatePicker()](https://forums.kodeco.com/t/page-462-showdatepicker/43181)
**Author:** [@kurtbitner](https://forums.kodeco.com/u/kurtbitner)\ **Replies:** 2\ **Last updated:** [June 2, 2018, 11:03pm UTC](https://forums.kodeco.com/t/page-462-showdatepicker/43181 "2018-06-02T23:03:20Z")
The function in the book has us search for the date row with the indexpath to set the tint color on the cellā€™s detail text label. However, I am getting nil for that value. Since we have the date label as an outlet, why cā€¦ --- ## [Why create the database explicitly?](https://forums.kodeco.com/t/why-create-the-database-explicitly/42933)
**Author:** [@gargoyle](https://forums.kodeco.com/u/gargoyle)\ **Replies:** 3\ **Last updated:** [June 2, 2018, 2:33pm UTC](https://forums.kodeco.com/t/why-create-the-database-explicitly/42933 "2018-06-02T14:33:51Z")
In your examples youā€™re creating a database config and then doing this: let database = PostgreSQLDatabase(config: databaseConfig) databases.add(database: database, as: .psql) services.register(databases) I realizā€¦ --- ## [Computed properties](https://forums.kodeco.com/t/computed-properties/42923)
**Author:** [@robac](https://forums.kodeco.com/u/robac)\ **Replies:** 8\ **Last updated:** [June 2, 2018, 10:46am UTC](https://forums.kodeco.com/t/computed-properties/42923 "2018-06-02T10:46:54Z")
Can you say a little more about computed properties. I like to include them in my model as it helps keep the code clean. Iā€™m interested in learning more about them. Are they resource intensive, when are they computed. Thā€¦ --- ## [Why optional properties in a class are represented as ā€œhas aā€ relationship?](https://forums.kodeco.com/t/why-optional-properties-in-a-class-are-represented-as-has-a-relationship/41681)
**Author:** [@andreskwan](https://forums.kodeco.com/u/andreskwan)\ **Replies:** 4\ **Last updated:** [May 31, 2018, 6:01pm UTC](https://forums.kodeco.com/t/why-optional-properties-in-a-class-are-represented-as-has-a-relationship/41681 "2018-05-31T18:01:47Z")
In page 40, the class AddressViewController define: public var address: Address? //Model For me, this is not a strong reference to the model, so it should be ā€œuseā€ or ā€œdependsā€ or ā€œdelegates toā€. At being optionalā€¦ --- ## [Chapter 23 alternative test](https://forums.kodeco.com/t/chapter-23-alternative-test/36981)
**Author:** [@ivangodfather](https://forums.kodeco.com/u/ivangodfather)\ **Replies:** 0\ **Last updated:** [November 26, 2017, 5:47pm UTC](https://forums.kodeco.com/t/chapter-23-alternative-test/36981 "2017-11-26T17:47:16Z")
I tried to do the test func test\_whenAccountAvailable\_updatesAccountStatus() by myself instead of using expectations. func test\_whenAccountAvailable\_updatesAccountStatusV2() { let accountSubject = PublishSubject\<ā€¦ --- ## [SceneKit editor](https://forums.kodeco.com/t/scenekit-editor/36999)
**Author:** [@kjwinters](https://forums.kodeco.com/u/kjwinters)\ **Replies:** 0\ **Last updated:** [November 27, 2017, 12:40am UTC](https://forums.kodeco.com/t/scenekit-editor/36999 "2017-11-27T00:40:46Z")
First time using SceneKit editor and when following along in tutorial when create file Game.scn the view in my 3D design area is all gray. It doesnā€™t appear the same like shown in tutorial with more like a 3d grid. And wā€¦ --- ## [Question about particle systems (p. 464, Swift 4)](https://forums.kodeco.com/t/question-about-particle-systems-p-464-swift-4/37150)
**Author:** [@salanthonyc](https://forums.kodeco.com/u/salanthonyc)\ **Replies:** 1\ **Last updated:** [November 29, 2017, 6:38pm UTC](https://forums.kodeco.com/t/question-about-particle-systems-p-464-swift-4/37150 "2017-11-29T18:38:06Z")
The code at the top of page 464 adds an ā€œexplosionā€ particle system to the scene. Is this a preconfigured particle system? How would I change this to something different, like smoke for example? --- ## [DropCharge Issue (Swift 4)](https://forums.kodeco.com/t/dropcharge-issue-swift-4/37168)
**Author:** [@salanthonyc](https://forums.kodeco.com/u/salanthonyc)\ **Replies:** 1\ **Last updated:** [November 30, 2017, 2:11am UTC](https://forums.kodeco.com/t/dropcharge-issue-swift-4/37168 "2017-11-30T02:11:47Z")
I finished the tutorial for the DropCharge game and I decided to change the image for the breakable platforms. When I did so the image loaded fine; however, for some reason the new image is stretched to form a square-likā€¦ --- ## [DropCharge: Error when trying to build and run](https://forums.kodeco.com/t/dropcharge-error-when-trying-to-build-and-run/37460)
**Author:** [@salanthonyc](https://forums.kodeco.com/u/salanthonyc)\ **Replies:** 0\ **Last updated:** [December 9, 2017, 9:43pm UTC](https://forums.kodeco.com/t/dropcharge-error-when-trying-to-build-and-run/37460 "2017-12-09T21:43:06Z")
I completed the DropCharge tutorial and everything was working fine. However, all of a sudden I am getting the following error: ā€œā€¦ Actions.sks: No such file or directoryā€ and I can not find that file in my trash or anywhā€¦ --- ## [Chapter 27: About the slide animation glitch problem](https://forums.kodeco.com/t/chapter-27-about-the-slide-animation-glitch-problem/36651)
**Author:** [@anastasioscho](https://forums.kodeco.com/u/anastasioscho)\ **Replies:** 0\ **Last updated:** [November 17, 2017, 12:40pm UTC](https://forums.kodeco.com/t/chapter-27-about-the-slide-animation-glitch-problem/36651 "2017-11-17T12:40:58Z")
I think the problem occurs only because of the wrong frame rect. In actionSlide(), if you replace this line of code: penguin.frame = CGRect(x: penguin.frame.origin.x, y: penguinY + (walkSize.height - slideSize.height)ā€¦ --- ## [Book error. Chapter 12, page 256 (pdf)](https://forums.kodeco.com/t/book-error-chapter-12-page-256-pdf/37593)
**Author:** [@mirceagrelus](https://forums.kodeco.com/u/mirceagrelus)\ **Replies:** 0\ **Last updated:** [December 14, 2017, 10:49am UTC](https://forums.kodeco.com/t/book-error-chapter-12-page-256-pdf/37593 "2017-12-14T10:49:19Z")
In chapter 12, on page 256 (pdf) the last code snippet removes the catchErrorJustReturn method, and the decription states: ā€œYou also removed the catchErrorJustReturn() call to the observable returned by currentWeather(ciā€¦ [Previous page](https://forums.kodeco.com/c/books/6.md?page=118) [Next page](https://forums.kodeco.com/c/books/6.md?page=120)