Download to read offline
![{
"name": "8419",
"type": 1,
"text": "...song Walking in LA?",
"markups": [
{
"type": 3,
"start": 300,
"end": 315,
"href": "https://somewhere.com",
"title": "",
"rel": ""
}
]
}](https://image.slidesharecdn.com/iostechtalkfinal-140827172238-phpapp01/75/Medium-TechTalk-iOS-20-2048.jpg)
![{
"name": "24cc",
"type": 4,
"text": "",
"markups": [],
"layout": 1,
"metadata": {
"id": "1*WwSQ20QNvf-WovuMLLslEA.jpeg",
"originalWidth": 453,
"originalHeight": 301
}
}](https://image.slidesharecdn.com/iostechtalkfinal-140827172238-phpapp01/75/Medium-TechTalk-iOS-21-2048.jpg)
![+ (id)sharedResource {
static id _instance;
static dispatch_once_t onceToken;
!
dispatch_once(&onceToken, ^{
_instance = [[Resource alloc] init];
});
!
return _instance;
}](https://image.slidesharecdn.com/iostechtalkfinal-140827172238-phpapp01/75/Medium-TechTalk-iOS-66-2048.jpg)
![1. User bookmark action is queued
PostViewController
PostViewService
PostService
Net
AuthCredentialDataService Logged in
dispatch_async(_backgroundQueue, ^{
[[Services postView] bookmark:_postId];
});](https://image.slidesharecdn.com/iostechtalkfinal-140827172238-phpapp01/75/Medium-TechTalk-iOS-89-2048.jpg)
![1. User bookmark action is queued
2. User signs out
PostViewController
PostViewService
PostService
Net
AuthCredentialDataService Logged out
LoginViewController
dispatch_async(_backgroundQueue, ^{
[[Services postView] bookmark:_postId];
});](https://image.slidesharecdn.com/iostechtalkfinal-140827172238-phpapp01/75/Medium-TechTalk-iOS-90-2048.jpg)
![1. User bookmark action is queued
2. User signs out
3. Bookmark action is dequeued
PostViewController
PostViewService
PostService
Net
AuthCredentialDataService Logged out
LoginViewController
dispatch_async(_backgroundQueue, ^{
[[Services postView] bookmark:_postId];
});](https://image.slidesharecdn.com/iostechtalkfinal-140827172238-phpapp01/75/Medium-TechTalk-iOS-91-2048.jpg)
![1. User bookmark action is queued
2. User signs out
3. Bookmark action is dequeued
PostViewController
PostViewService
PostService
Net
AuthCredentialDataService Logged out
LoginViewController
dispatch_async(_backgroundQueue, ^{
[[Services postView] bookmark:_postId];
});](https://image.slidesharecdn.com/iostechtalkfinal-140827172238-phpapp01/75/Medium-TechTalk-iOS-92-2048.jpg)
![1. User bookmark action is queued
2. User signs out
3. Bookmark action is dequeued
PostViewController
PostViewService
PostService
Net
AuthCredentialDataService Logged out
LoginViewController
dispatch_async(_backgroundQueue, ^{
[[Services postView] bookmark:_postId];
});](https://image.slidesharecdn.com/iostechtalkfinal-140827172238-phpapp01/75/Medium-TechTalk-iOS-93-2048.jpg)
![1. User bookmark action is queued
2. User signs out
3. Bookmark action is dequeued
PostViewController
PostViewService
PostService
Net
AuthCredentialDataService Logged out
LoginViewController
dispatch_async(_backgroundQueue, ^{
[[Services postView] bookmark:_postId];
});](https://image.slidesharecdn.com/iostechtalkfinal-140827172238-phpapp01/75/Medium-TechTalk-iOS-94-2048.jpg)
![1. User bookmark action is queued
2. User signs out
3. Bookmark action is dequeued
4. Bookmark request 401s
PostViewController
PostViewService
PostService
Net
AuthCredentialDataService Logged out
LoginViewController
dispatch_async(_backgroundQueue, ^{
[[Services postView] bookmark:_postId];
});](https://image.slidesharecdn.com/iostechtalkfinal-140827172238-phpapp01/75/Medium-TechTalk-iOS-95-2048.jpg)
![1. User bookmark action is queued
2. User signs out
3. Bookmark action is dequeued
4. Bookmark request 401s
5. PostViewController is cleaned up
PostViewService
PostService
Net
AuthCredentialDataService Logged out
LoginViewController
dispatch_async(_backgroundQueue, ^{
[[Services postView] bookmark:_postId];
});](https://image.slidesharecdn.com/iostechtalkfinal-140827172238-phpapp01/75/Medium-TechTalk-iOS-96-2048.jpg)
![Option 2: Embrace time dependence
Advantages!
- Doesn’t require refactoring
Disadvantages!
- Requires global knowledge of all the apps components
- Affects other, disjunct service consumers
- Difficult to test
- Async bookmark operation still fails
- (void)logOut {
// Synchronously wipe all the user-dependent data
[[Services authCredentialDataService] wipeData];
// …
!
// Reload UI with new global data
[_appController reload];
}](https://image.slidesharecdn.com/iostechtalkfinal-140827172238-phpapp01/75/Medium-TechTalk-iOS-99-2048.jpg)
![Option 3: Dependency inject your user-dependent data
- Eliminates time dependence in the service layer
- Gracefully supports switching authentication contexts
- Easy to test interfaces with a mock Session object
- Async bookmark operation succeeds
- (void)logOut {
// Create an unauthenticated session
Session *newSession = [Session loggedOutSession];
!
// Reload UI with logged out session
[_appController loadSession:newSession];
}](https://image.slidesharecdn.com/iostechtalkfinal-140827172238-phpapp01/75/Medium-TechTalk-iOS-100-2048.jpg)
![PostViewService
PostService
Net
PostViewController
Session
[[PostViewController alloc] initWithPostId:postId
session:session];
PostViewController
Session](https://image.slidesharecdn.com/iostechtalkfinal-140827172238-phpapp01/75/Medium-TechTalk-iOS-107-2048.jpg)
![1. User bookmark action is queued
PostViewService
PostService
Net
PostViewController
Logged in
Session
dispatch_async(_backgroundQueue, ^{
[[Services postView] bookmark:_postId session:_session];
});](https://image.slidesharecdn.com/iostechtalkfinal-140827172238-phpapp01/75/Medium-TechTalk-iOS-112-2048.jpg)
![1. User bookmark action is queued
2. User signs out
PostViewService
PostService
Net
PostViewController
Logged in
Session
LoginViewController
Logged out
Session
dispatch_async(_backgroundQueue, ^{
[[Services postView] bookmark:_postId session:_session];
});](https://image.slidesharecdn.com/iostechtalkfinal-140827172238-phpapp01/75/Medium-TechTalk-iOS-113-2048.jpg)
![1. User bookmark action is queued
2. User signs out
3. Bookmark action is dequeued
PostViewService
PostService
Net
PostViewController
Logged in
Session
LoginViewController
Logged out
Session
dispatch_async(_backgroundQueue, ^{
[[Services postView] bookmark:_postId session:_session];
});](https://image.slidesharecdn.com/iostechtalkfinal-140827172238-phpapp01/75/Medium-TechTalk-iOS-114-2048.jpg)
![1. User bookmark action is queued
2. User signs out
3. Bookmark action is dequeued
PostViewService
PostService
Net
PostViewController
Logged in
Session
LoginViewController
Logged out
Session
dispatch_async(_backgroundQueue, ^{
[[Services postView] bookmark:_postId session:_session];
});](https://image.slidesharecdn.com/iostechtalkfinal-140827172238-phpapp01/75/Medium-TechTalk-iOS-115-2048.jpg)
![1. User bookmark action is queued
2. User signs out
3. Bookmark action is dequeued
PostViewService
PostService
Net
PostViewController
Logged in
Session
LoginViewController
Logged out
Session
dispatch_async(_backgroundQueue, ^{
[[Services postView] bookmark:_postId session:_session];
});](https://image.slidesharecdn.com/iostechtalkfinal-140827172238-phpapp01/75/Medium-TechTalk-iOS-116-2048.jpg)
![1. User bookmark action is queued
2. User signs out
3. Bookmark action is dequeued
4. Bookmark action succeeds
PostViewService
PostService
Net
PostViewController
Logged in
Session
LoginViewController
Logged out
Session
dispatch_async(_backgroundQueue, ^{
[[Services postView] bookmark:_postId session:_session];
});](https://image.slidesharecdn.com/iostechtalkfinal-140827172238-phpapp01/75/Medium-TechTalk-iOS-117-2048.jpg)
![1. User bookmark action is queued
2. User signs out
3. Bookmark action is dequeued
4. Bookmark action succeeds
5. PostViewController and logged in
Session are cleaned up
PostViewService
PostService
Net
LoginViewController
Logged out
Session
dispatch_async(_backgroundQueue, ^{
[[Services postView] bookmark:_postId session:_session];
});](https://image.slidesharecdn.com/iostechtalkfinal-140827172238-phpapp01/75/Medium-TechTalk-iOS-118-2048.jpg)
![Lessons Learned [2]
• Make it easy for everyone to see which version of
the app each group has
• Easy visibility and communication on features of
each of these groups
• Automate everything, consider Jenkins CI over
Xcode Bots](https://image.slidesharecdn.com/iostechtalkfinal-140827172238-phpapp01/75/Medium-TechTalk-iOS-150-2048.jpg)
More Related Content
Medium TechTalk — iOS
- 4. How might wecreate a simple and intuitive mobile consumption experience for Medium?
- 6. How might wecreate a simple and intuitive mobile consumption experience for Medium?
- 7. How might wecreate a delightful, simple and intuitive mobile consumption experience for Medium?
- 13. History stack Futurestack Cover Flow
- 14.
- 18. • 60 FPS •Memory • Parallax UIKit & TextKit
- 19. { "content": { ... "bodyModel": { "elements":<Elements>, "sections": <Sections> }, ... }, }
- 20. { "name": "8419", "type": 1, "text":"...song Walking in LA?", "markups": [ { "type": 3, "start": 300, "end": 315, "href": "https://somewhere.com", "title": "", "rel": "" } ] }
- 21. { "name": "24cc", "type": 4, "text":"", "markups": [], "layout": 1, "metadata": { "id": "1*WwSQ20QNvf-WovuMLLslEA.jpeg", "originalWidth": 453, "originalHeight": 301 } }
- 22.
- 23. { "name": "7b28", "startIndex": 31, "backgroundImage":{ "id": "1*DhgXe8j0YqltMNM6-pRy6Q.jpeg", "originalWidth": 1920, "originalHeight": 1200 }, "textLayout": 2, "imageLayout": 2 }
- 24.
- 25.
- 26.
- 27.
- 28.
- 29.
- 30.
- 31.
- 32.
- 33.
- 34.
- 35.
- 36.
- 37.
- 38.
- 39.
- 40.
- 41.
- 42.
- 43.
- 44.
- 45. Shapes & things Buildingthe data layer of the Medium iOS app ! ! Elizabeth Ford @infraredflower
- 47.
- 48.
- 49. User’s name Bio List ofstories
- 50. • How willwe deal with the possibility of API changes? • especially since the app will be long-lived • How do we minimize the number of requests from the iOS app to the server? • How can we avoid making separate API routes for the iOS app (and every client thereafter)? Questions…
- 51. Clearly bad ideas •Make multiple requests to display one Post, User, or Collection • Make new iOS routes with exactly what we need • Only save full objects
- 52. Clearly bad ideas •Save partial objects and if we need a full object, just check to see if all the fields are set in the object in the cache • Is the field supposed to be “” or was it never set?
- 53. Speaking of which… •How should we deal with merging two objects?
- 54. • Merging afull post and a partial post Example
- 55.
- 56.
- 57.
- 58.
- 59. Complexity hidden bydata layer • merges objects • determines when to make network requests
- 60. Complexity hidden bydata layer
- 61. What about dealingwith a changing API? • explicit definitions for the resources returned by API endpoints • tests based on these definitions
- 62. Possible areas forimprovement • one service to return any shape (instead of a separate data service for each type of object) • autogenerate shape definitions from protocol buffers (on both server and client)
- 63. • easy toadd features on the iOS side • easy to make changes on the server side without breaking the iOS client • minimize # of server requests Shapes!
- 64.
- 65. Meet the Singletons JimmyO’Neill Engineer, Medium @jmyonl
- 66. + (id)sharedResource { staticid _instance; static dispatch_once_t onceToken; ! dispatch_once(&onceToken, ^{ _instance = [[Resource alloc] init]; }); ! return _instance; }
- 67. A singleton restrictsthe instantiation of a class to one object. They are often lazily instantiated. They can be accessed globally by any module of a program.
- 68.
- 69. Since singletons areso commonplace in CocoaTouch, many developers overuse them.
- 70. A lot ofthis: Singletons are bad!! ! Not a lot of this: Singletons can be bad because ____. Here’s a real example!
- 71. ! ! ! I’m going tofocus on this: Singletons can be bad because ____. Here’s a real example!
- 73. - (AuthCredential *)mediumAuthCredential; ! -(void)saveMediumAuthCredential:(AuthCredential *)credential; AuthCredentialDataService Keychain AuthCredentialDataService
- 74. - (void)fetch:(NetRequest *)request completion:(void(^)(NetResponse *, NSError *))completion; Net AuthCredentialDataService NetNet
- 75. - (void)fetchPostById:(NSString *)postId completion:(void(^)(Post*post, NSError *error))completion; PostService Net AuthCredentialDataService PostService
- 76. - (void)fetchPostViewDataWithPostId:(NSString *)postId completion:(void(^)(Post*post, PostViewModel *postViewModel, PostUserData *postUserData, NSError *error))callback; PostViewService PostService Net AuthCredentialDataService PostViewService
- 77.
- 78.
- 79.
- 80. Time dependence isn’tan issue until the underlying data starts changing. PostViewController PostViewService PostService Net AuthCredentialDataServiceAuthCredentialDataService PostViewController
- 81. If your appsupports sign out, the underlying authentication data is changing. PostViewController PostViewService PostService Net AuthCredentialDataServiceAuthCredentialDataService PostViewController
- 82. What problems doestime dependence cause? - Functional impurity - Leaky abstraction - Background task failures - Difficult to test PostViewController PostViewService PostService Net AuthCredentialDataServiceAuthCredentialDataService PostViewController
- 83.
- 84.
- 85.
- 87.
- 88.
- 89. 1. User bookmarkaction is queued PostViewController PostViewService PostService Net AuthCredentialDataService Logged in dispatch_async(_backgroundQueue, ^{ [[Services postView] bookmark:_postId]; });
- 90. 1. User bookmarkaction is queued 2. User signs out PostViewController PostViewService PostService Net AuthCredentialDataService Logged out LoginViewController dispatch_async(_backgroundQueue, ^{ [[Services postView] bookmark:_postId]; });
- 91. 1. User bookmarkaction is queued 2. User signs out 3. Bookmark action is dequeued PostViewController PostViewService PostService Net AuthCredentialDataService Logged out LoginViewController dispatch_async(_backgroundQueue, ^{ [[Services postView] bookmark:_postId]; });
- 92. 1. User bookmarkaction is queued 2. User signs out 3. Bookmark action is dequeued PostViewController PostViewService PostService Net AuthCredentialDataService Logged out LoginViewController dispatch_async(_backgroundQueue, ^{ [[Services postView] bookmark:_postId]; });
- 93. 1. User bookmarkaction is queued 2. User signs out 3. Bookmark action is dequeued PostViewController PostViewService PostService Net AuthCredentialDataService Logged out LoginViewController dispatch_async(_backgroundQueue, ^{ [[Services postView] bookmark:_postId]; });
- 94. 1. User bookmarkaction is queued 2. User signs out 3. Bookmark action is dequeued PostViewController PostViewService PostService Net AuthCredentialDataService Logged out LoginViewController dispatch_async(_backgroundQueue, ^{ [[Services postView] bookmark:_postId]; });
- 95. 1. User bookmarkaction is queued 2. User signs out 3. Bookmark action is dequeued 4. Bookmark request 401s PostViewController PostViewService PostService Net AuthCredentialDataService Logged out LoginViewController dispatch_async(_backgroundQueue, ^{ [[Services postView] bookmark:_postId]; });
- 96. 1. User bookmarkaction is queued 2. User signs out 3. Bookmark action is dequeued 4. Bookmark request 401s 5. PostViewController is cleaned up PostViewService PostService Net AuthCredentialDataService Logged out LoginViewController dispatch_async(_backgroundQueue, ^{ [[Services postView] bookmark:_postId]; });
- 97. How do wefix this?
- 98. Option 1: YOLO Advantages! -Very little work - No testing needed - Funny later in your career Disadvantages! - Horrible UX - Async bookmark operation still fails - (void)logOut { // nuke everything exit(0); }
- 99. Option 2: Embracetime dependence Advantages! - Doesn’t require refactoring Disadvantages! - Requires global knowledge of all the apps components - Affects other, disjunct service consumers - Difficult to test - Async bookmark operation still fails - (void)logOut { // Synchronously wipe all the user-dependent data [[Services authCredentialDataService] wipeData]; // … ! // Reload UI with new global data [_appController reload]; }
- 100. Option 3: Dependencyinject your user-dependent data - Eliminates time dependence in the service layer - Gracefully supports switching authentication contexts - Easy to test interfaces with a mock Session object - Async bookmark operation succeeds - (void)logOut { // Create an unauthenticated session Session *newSession = [Session loggedOutSession]; ! // Reload UI with logged out session [_appController loadSession:newSession]; }
- 101. @interface Session :NSObject ! - (instancetype)initWithAuth:(AuthCredential *)authCredential; ! @property (nonatomic, strong, readonly) NSString *sessionId; @property (nonatomic, strong, readonly) AuthCredential *authCredential; ! - (BOOL)isAuthenticated; ! @end The Session object directly models user-dependent state, and is injected into objects that need it.
- 102. - (void)fetch:(NetRequest *)request completion:(void(^)(NetResponse *, NSError *))completion; Net AuthCredentialDataService Net
- 103.
- 104. Net Session - (void)fetch:(NetRequest *)request session:(Session*)session completion:(void (^)(NetResponse *, NSError *))completion; Net
- 105. PostService Net Session - (void)fetchPostById:(NSString *)postId session:(Session*)session completion:(void(^)(Post *post, NSError *error))completion; PostService
- 106. PostViewService PostService Session Net - (void)fetchPostViewDataWithPostId:(NSString *)postId session:(Session*)session completion:(void(^)(Post *post, PostViewModel *postViewModel, PostUserData *postUserData, NSError *error))callback; PostViewService
- 107.
- 108.
- 109.
- 111.
- 112. 1. User bookmarkaction is queued PostViewService PostService Net PostViewController Logged in Session dispatch_async(_backgroundQueue, ^{ [[Services postView] bookmark:_postId session:_session]; });
- 113. 1. User bookmarkaction is queued 2. User signs out PostViewService PostService Net PostViewController Logged in Session LoginViewController Logged out Session dispatch_async(_backgroundQueue, ^{ [[Services postView] bookmark:_postId session:_session]; });
- 114. 1. User bookmarkaction is queued 2. User signs out 3. Bookmark action is dequeued PostViewService PostService Net PostViewController Logged in Session LoginViewController Logged out Session dispatch_async(_backgroundQueue, ^{ [[Services postView] bookmark:_postId session:_session]; });
- 115. 1. User bookmarkaction is queued 2. User signs out 3. Bookmark action is dequeued PostViewService PostService Net PostViewController Logged in Session LoginViewController Logged out Session dispatch_async(_backgroundQueue, ^{ [[Services postView] bookmark:_postId session:_session]; });
- 116. 1. User bookmarkaction is queued 2. User signs out 3. Bookmark action is dequeued PostViewService PostService Net PostViewController Logged in Session LoginViewController Logged out Session dispatch_async(_backgroundQueue, ^{ [[Services postView] bookmark:_postId session:_session]; });
- 117. 1. User bookmarkaction is queued 2. User signs out 3. Bookmark action is dequeued 4. Bookmark action succeeds PostViewService PostService Net PostViewController Logged in Session LoginViewController Logged out Session dispatch_async(_backgroundQueue, ^{ [[Services postView] bookmark:_postId session:_session]; });
- 118. 1. User bookmarkaction is queued 2. User signs out 3. Bookmark action is dequeued 4. Bookmark action succeeds 5. PostViewController and logged in Session are cleaned up PostViewService PostService Net LoginViewController Logged out Session dispatch_async(_backgroundQueue, ^{ [[Services postView] bookmark:_postId session:_session]; });
- 119. Think back tothe original decision. Net AuthCredentialDataService Keychain Net
- 120. It appears innocentwithout context. Net AuthCredentialDataService Keychain Net
- 121. Let’s do ourbest to recognize! the larger context earlier. PostViewController PostViewService PostService Net AuthCredentialDataService Data dependence Time dependence AuthCredentialDataService PostViewController
- 122. Singletons are globalstate.
- 123. Singletons assume thatthe lifetime of the state they encapsulate is equal to the lifetime of the program.
- 124. Singletons are notevil.
- 125. But often, dependencyinjection is a sounder option.
- 126.
- 127. Designing an iOS DistributionPipeline Vinicius Baggio Fuentes
- 128. Delivery on theWeb • Feature Toggle • Tracking and measuring • Rolling releases • Multiple deploys a day
- 129.
- 130. How can wedo the same for apps?
- 131. Challenges • Pre-App Storedistribution is complicated • Slow response time on App Store approvals
- 132. Fast release requirements •Over-the-air updates • Crash report system • Authorization server • Feature toggles • Versioning system • Distribution channels
- 133. OTA updates, crashreports and authorization • Crashlytics • TestFlight / Apple’s upcoming beta program • HockeyApp
- 134. Feature toggle • A/BTesting • Long running feature development • Emergencies
- 135.
- 136. Feature toggle tools •GroundControl, SkyLab & related projects • Roll-your-own (not recommended)
- 137.
- 138.
- 139.
- 140.
- 141. master 640a0a5 build-1.3 638b3b7 03dc0b54aee8cd dde3123 bb24c74 build-1.3.0
- 142. master 640a0a5 build-1.3 638b3b7 03dc0b54aee8cd 04d773b dde3123 bb24c74 f1e48af build-1.3.1 build-1.3.0
- 143. master 640a0a5 build-1.3 build-1.4 638b3b7 03dc0b54aee8cd 04d773b dde3123 bb24c74 f1e48af build-1.3.1 f1e48af build-1.3.0 build-1.4.0
- 144.
- 145. Distribution channels Developers MediumStaff On merge Version 1.4.90
- 146. Distribution channels Version 1.4.90 DevelopersMedium Staff Trusted testers On merge After a day
- 147. Distribution channels Version 1.4.90 DevelopersMedium Staff Trusted testers Beta testers On merge After a day After a week
- 148. Lessons Learned • Xcconfigfiles and -derivedDataPath compiler flag helps builds being deterministic • Plist manipulation in Python, nomad-cli tools (esp. Shenzhen, Cupertino)
- 149. Xcconfig example #include "base.xcconfig" #include"Servers/medium.xcconfig" #include "Build/config-debug.xcconfig" ! MEDIUM_DISTRIBUTION_CHANNEL = mediumStaff
- 150. Lessons Learned [2] •Make it easy for everyone to see which version of the app each group has • Easy visibility and communication on features of each of these groups • Automate everything, consider Jenkins CI over Xcode Bots
- 151. Thanks! • References: • www.nomad-cli.com •jenkins-ci.org • crashlytics.com • https://github.com/mattt/GroundControl • http://semver.org • hockeyapp.net • http://techcrunch.com/2014/06/02/ios-testflight/ Vinícius Baggio Fuentes vinny@medium.com @vinibaggio
- 152.