CocoaHeads BNE Sept 2014

"Building Realtime Apps", including latest news, Rob Pearson's presentation on ReactiveCocoa, Roger Stephen's presentation on Firebase and Ben Stovold's presentation on putting the two together.

Transcript

1. cocoaheadsbne.org
4. Rob: ReactiveCocoa Roger: Firebase Ben: Realtime Apps
5. News
7. vimeo.com/channels/nsconf6
8. 4.7-inch 1334 × 750, 326 PPI @2x 5.5-inch 2208 × 1242, 461 PPI @3x
11. Universal storyboards, size classes, and Auto Layout combine to enable you to design for all devices using a single interface document, and we're bringing this to another area, Launch Images. With iOS 8, you can now provide an Interface Builder document and, at runtime, have the OS generate all of the necessary Launch Images for you. [ Applause ] So now you no longer need to provide the individual assets and you can use the same great design tools for your interfaces and your launch presentations.
17. ReactiveCocoa Lessons Learned Rob Pearson @robpearson
18. Maple Pixel Everyday Transit 1.0 coming soon ...
19. FrieNDA
20. Everyday ReactiveCocoa 1. Functional Programming Briefly 2. Signals and Pipelines 3. RAC Lessons Learned
21. Functional Programming Briefly
24. Signals and Pipelines
25. Demo
27. Transit Dashboard Pipeline Inputs: * List of Everyday Trips (Favourites) * GPS Location * Time Outputs: * Next Transit Trip
28. Pipelines == RACSignals
29. RACSignal Example [RACSignal createSignal:^(id<RACSubscriber subscriber) { // Do Something u_int32_t r = arc4random(); // Start (and in this case complete) the signal. [subscriber sendNext:@(r)]; [subscriber sendCompleted]; return (RACDisposable *)nil; }];
30. So we have Pipelines/ Signals. Now what?
31. Two Options RAC(self, viewModel.something) RACSignal subscribeNext: error: completed:
32. RAC Lessons Learned
34. KVO
35. No, Seriously ... KVO!
36. Key Value Observing // Bind Transit Trips to Table View [RACObserve(self.viewModel, everydayTransitTrips) subscribeNext:^(id x) { @strongify(self); [self.tableView reloadData]; }];
37. Work with Protocols
38. rac_signalForSelector [[self rac_signalForSelector:@selector(searchBar:textDidChange:) fromProtocol:@protocol(UISearchBarDelegate)] subscribeNext:^(RACTuple *value) { @strongify(self); UISearchBar *searchBar = value.first; if (searchBar == self.departingLocationsSearchBar) { [self.viewModel filterDepartingLocationsByName:self.departingLocationsSearchBar.text]; } else { [self.viewModel filterArrivingLocationsByName:self.arrivingLocationsSearchBar.text]; } }];
39. Take advantage of RAC Category Methods
40. NotificationCentre RACSignal *appActiveSignal = [[[[NSNotificationCenter.defaultCenter rac_addObserverForName:UIApplicationDidBecomeActiveNotification object:nil] mapReplace:@YES] startWith:@YES] setNameWithFormat:@"%@ appActive", self];
41. Signal Tips and Tricks
42. Reactive Timer 1 Map Time
43. Reactive Timer 1 [[[[[RACSignal interval:60 onScheduler:[RACScheduler scheduler]] map:^id(NSDate *timestamp) { @strongify(self); if (self.hasEverydayTrips != nil && [@(YES) isEqualToNumber:self.hasEverydayTrips]) { return @"SEQ"; } else { return @"Everyday Transit"; } }] startWith:@"Everyday Transit"] distinctUntilChanged] deliverOn:[RACScheduler mainThreadScheduler]];
44. Reactive Timer 2 Empty Signal with a delay.
45. Reactive Timer 2 RACSignal *nextTransitTripIntervalSignal = [RACSignal interval:1 onScheduler:[RACScheduler scheduler]]; RACSignal *currentUserLocationRefreshDelay = [[RACSignal empty] delay:60]; RACSignal *currentUserLocationRefreshSignal = [[[self.locationService.locationSignal take:1] concat:currentUserLocationRefreshDelay] repeat];
46. Real Power is combing and chaining signals
47. Protips • Start by reading IntroToRx.com • Start small and iterate. • Logging w/ Something like Cocoalumberjack • Asks questions by opening issues at http://github.com/ ReactiveCocoa/
48. Challenges • Thinking like a Functional Programmer • ReactiveCocoa Doco • Debugging
49. References • Github Repo: http://github.com/ReactiveCocoa/ • Ray Wenderlich Tutorial: https://bit.ly/1rXA31Y • Big Nerd Ranch Tutorial: https://bit.ly/1mp04mI • FRP on iOS by Ash Furrow: https://leanpub.com/iosfrp • Brent Simmons on ReactiveCocoa: https://bit.ly/PcyjCL
50. Questions?
51. Firebase Roger Stephen 2014–09–02 Cocoaheads Brisbane
52. • backend service for realtime storage and sync • Device-device sync e.g. chat, notifications, location • www.firebase.com
53. How does it work? • NoSQL, JSON • Snapshots • Forge • SDKs
54. Good things… • Fast, easy development • APIs • Docs • Sync for free
55. Not so good things… • NoSQL != SQL • Denormalization != Normalization • Static Library
56. Demo • A Simple Chat App
57. Crap's gonna hit the fan Jones, and this place ain't prepared for shit! This firebase can’t be defended
58. Realtime Apps
59. Event-driven data
 +
 Value objects
 +
 FRP
 =
 :)
60. Demo bit.ly/getfireside
61. cocoaheadsbne.org
62. cocoaheadsbne.org http://daringfireball.net/2014/08/larger_iphone_display_conjecture
 http://instagram-engineering.tumblr.com/post/95922900787/hyperlapse http://oleb.net/blog/2014/08/replacing-launch-images-with-storyboards/ http://devetc.org/code/2014/07/07/auto-layout-and-views-that-wrap.html http://useyourloaf.com/blog/2014/08/07/self-sizing-table-view-cells.html
 http://blog.brianlovin.com/design-details-pinterest-for-ios/ http://www.commitstrip.com/en/2014/08/18/the-dilemna-of-mobile-apps-development