Combine

Transcript

1. © The App Business © The App Business COMBINE 1 ⚡ ✨ ⭐ ⭐ ✨ ⚡
2. © The App Business 2 a = b + c
3. Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling © The App Business Agenda
4. © The App Business PROBLEM STATEMENT 4
5. © The App Business © The App Business 5 Server Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
6. © The App Business © The App Business 6 Server Target/Action URLSession Callbacks KVO Timer Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
7. Target/Action Notification Center URLSession Key-value observing Callbacks © The App Business Asynchronous Interfaces Nope. Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
8. © The App Business 8 COMBINE Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
9. © The App Business INTRODUCTION TO COMBINE 9
10. Publisher Subscriber Operator Subjects © The App Business Key Concepts Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
11. © The App Business Publisher 11 Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling A publisher fundamentally provides data, when available, upon request. It is described with two associated types: one for Output and one for Failure.
12. © The App Business 12 Publisher
13. © The App Business 13 Publisher
14. © The App Business 14 Publisher
15. © The App Business 15 Publisher
16. What? Defines how values and errors are produced Type Value Type Feature Allows registration of a subscriber © The App Business Publisher 16 Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
17. Value Error Completion © The App Business Types of Values Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
18. © The App Business Value 18 Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
19. © The App Business Error 19 Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
20. © The App Business Completion 20 Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
21. A protocol that declares a type that can receive input from a publisher. A given subscriber’s Input and Failure associated types must match the Output and Failure of its corresponding publisher. © The App Business Subscriber 21 Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
22. © The App Business Subscriber 22 Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
23. © The App Business 23 Subscriber
24. © The App Business 24 Subscriber
25. © The App Business 25 Subscriber
26. © The App Business 26 Subscriber
27. © The App Business 27 Subscriber
28. © The App Business 28 Subscriber
29. What? Receives value Type Reference Type Feature Can request N values © The App Business Subscriber 29 Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
30. Feature Can request N values © The App Business 30 Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
31. © The App Business © The App Business 31 Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
32. © The App Business © The App Business BACKPRESSURE 32 Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
33. © The App Business Backpressure Resistance or force opposing the desired flow of water through pipes. 33 Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling software data
34. Computational Speed Awaiting user inputs Server Capability © The App Business Backpressure Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
35. © The App Business Backpressure Buffering 35
36. © The App Business Backpressure Buffering 36
37. © The App Business Backpressure Dropping 37
38. © The App Business Backpressure Dropping 38
39. Buffering Using a buffer to temporarily store and process data. Dropping Dropping requests instead of handling them. © The App Business 39 Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling Backpressure
40. © The App Business © The App Business 40 Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling Backpressure
41. Subscribers.Demand © The App Business Backpressure 41 Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
42. © The App Business Backpressure 42 Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
43. © The App Business Pattern 43 Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling subscribe() receive(subscription:) Here you go: request(_: Demand) I demand 3 values. receive(completion:) receive(_: Input) Here are 3 values: Subscriber Publisher
44. © The App Business Pattern 44 Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling subscribe() receive(subscription:) Here you go: request(_: Demand) I demand 3 values. receive(completion:) receive(_: Input) Here are 3 values: Subscriber Publisher
45. © The App Business HOW TO USE IT? 45
46. What? Pre-built functions to transform and interact with values. Feature Support bringing together outputs from different pipelines, or splitting to send to multiple subscribers. © The App Business Operators 46 Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
47. © The App Business 47 Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
48. Publisher Operator Subscriber © The App Business Pipeline 48 Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
49. © The App Business Operator 49
50. © The App Business Operator 50
51. © The App Business Operator 51
52. © The App Business 52 Operators can also help with error handling and retry logic, buffering and prefetch, controlling timing, and supporting debugging. Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
53. © The App Business 53 Operators can also help with error handling and retry logic, buffering and prefetch, controlling timing, and supporting debugging. Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
54. © The App Business 54 Operators can also help with error handling and retry logic, buffering and prefetch, controlling timing, and supporting debugging. Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
55. © The App Business 55 Operators can also help with error handling and retry logic, buffering and prefetch, controlling timing, and supporting debugging. Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
56. © The App Business 56 Operators can also help with error handling and retry logic, buffering and prefetch, controlling timing, and supporting debugging. Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
57. © The App Business 57 Operators can also help with error handling and retry logic, buffering and prefetch, controlling timing, and supporting debugging. Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
58. © The App Business 58 Operators can also help with error handling and retry logic, buffering and prefetch, controlling timing, and supporting debugging. Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
59. What? A special case of publisher that adopts the Subject protocol which allows external entities to publish values. Feature Used to "inject" values into a stream, by calling the subject’s send() method © The App Business Subjects 59 Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
60. © The App Business Subject 60
61. © The App Business Subject 61
62. © The App Business Subject 62
63. © The App Business Subject 63
64. CurrentValueSubject A subject that wraps a single value and publishes a new element whenever the value changes. PassThroughSubject A subject that broadcasts elements to downstream subscribers. © The App Business Types of Built-In Subjects 64 Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
65. © The App Business COMBINE PATTERNS 65
66. Make use of existing Publishers, Operators & Subscribers Create Publishers that wrap a remote API call Create Subscribers that consume an API © The App Business Developing with Combine Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
67. © The App Business 67 Scenario: Creating a subscriber with sink Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
68. © The App Business 68 Simple sink
69. © The App Business 69 Sink with completion
70. © The App Business 70 Sink with completion
71. © The App Business 71 Sink with completion
72. © The App Business 72 Scenario: Making a network request with dataTaskPublisher Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
73. © The App Business 73 Network Request
74. © The App Business 74 Network Request let publisher: Publishers.Decode<Publishers.Map<URLSession.DataTaskPublisher, JSONDecoder.Input>, RawBase64, JSONDecoder> let publisher: AnyPublisher<RawBase64, Publishers.Decode<Upstream, Output, Coder>.Failure>
75. © The App Business 75 Network Request
76. © The App Business ERROR HANDLING 76
77. © The App Business 77 Scenario: Using catch to handle errors in a one-shot pipeline Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
78. © The App Business 78 Operator: catch
79. © The App Business 79 Operator: catch
80. © The App Business WHERE TO GO FROM HERE? 80
81. Testing Debugging SwiftUI Integration Entwine Test Flux © The App Business Where to go from here? Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling
82. © The App Business Hello 82 Problem Statement Introduction to Combine How to use it? Combine Patterns Error Handling Summary
83. © The App Business 83
84. © The App Business Talks & Resources
85. © The App Business Introducing Combine https://developer.apple.com/videos/play/wwdc2019/722/
86. © The App Business Combine in Practice https://developer.apple.com/videos/play/wwdc2019/721/
87. © The App Business Using Combine, by Joseph Heck https://heckj.github.io/swiftui-notes/
88. © The App Business MovieSwift, by Thomas Ricouard https://github.com/Dimillian/MovieSwiftUI
89. © The App Business 89 Questions? I may have some answers. I think.
90. © The App Business 90 Questions! You better have answers.
91. Functions that are used to publish values. Functions that are used to operate on published values. Functions that are used exclusively for handling errors. Functions that map published values using a closure. Functions that subscribe to publishers. © The App Business What is an Operator?
92. Functions that are used to publish values. Functions that are used to operate on published values. Functions that are used exclusively for handling errors. Functions that map published values using a closure. Functions that subscribe to publishers. © The App Business What is an Operator?
93. Values, Error, Completion Subscribers, Error, Completion Signals, Error, Completion Operators Books © The App Business What are the types of values that a Publisher can publish?
94. Values, Error, Completion Subscribers, Error, Completion Signals, Error, Completion Operators Books © The App Business What are the types of values that a Publisher can publish?
95. Operator Subscriber Publisher Signal © The App Business Subjects are a type of ___________
96. Operator Subscriber Publisher Signal © The App Business Subjects are a type of ___________
97. A function that creates a publisher and sends values. An operator that subscribes to a publisher. A function that creates a subscriber and receives values. A place where you wash your hands. © The App Business What is a sink?
98. A function that creates a publisher and sends values. An operator that subscribes to a publisher. A function that creates a subscriber and receives values. A place where you wash your hands. © The App Business What is a sink?
99. IntegerValue & PassThrough CurrentValue & PassThrough Future & Promises Unrealised Hopes & Dreams © The App Business Types of in-built Subjects
100. IntegerValue & PassThrough CurrentValue & PassThrough Future & Promises Unrealised Hopes & Dreams © The App Business Types of in-built Subjects
101. © The App Business © The App Business 101 ⚡ ✨ ⭐ ⭐ ✨ ⚡ THANK YOU.