Promise on iOs
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This document discusses promises and futures in iOS development. It begins by explaining callback hell and the problems it causes. It then defines what a promise is, including deferred and settled states. It covers chaining and parallel task patterns using promises, including continueWith, continueOnSuccessWith, continueOnErrorWith, whenAll, and whenAny. It also discusses handling errors. An example is provided using the Bolt framework to create promises from asynchronous and synchronous functions. Finally, it lists the advantages of using promises such as readable, testable and reusable code.
Promise on iOs
- 1. Future/Promise on iOS Thinh VoXuan Summer 2016
- 2. 1. Callback hell & Another problem 2. What is promise ? 3. Chaining tasks pattern 4. Parallel tasks pattern 5. Errors handler 6. Example with Bolt Framework 7. Advantages Agenda Future/Promise on iOS 2
- 3. • Synchronous vs Asynchronous Not Today Future/Promise on iOS 3
- 4. Callback hell & Another problems Future/Promise on iOS 4
- 5. Callback hell & Another problems Future/Promise on iOS 5
- 6. Callback hell & Another problems Future/Promise on iOS 6
- 7. Callback hell & Another problems Future/Promise on iOS 7 How could I call 3 requests on same times?
- 8. Callback hell & Another problems Future/Promise on iOS 8 Hard to understand and follow the logic ? What happen when 1 request has error?
- 9. What is promise ? Future/Promise on iOS 9 • Deferred State • pending • Settled State • fulfilled • rejected
- 10. What is promise ? - fulfilled Future/Promise on iOS 10 fulfilled could be •Value •Object •Another Promise
- 11. What is promise ? - rejected Future/Promise on iOS 11 rejected could be •Error
- 12. Chaining tasks pattern Future/Promise on iOS 12 • continueWith: Enqueues a given closure to be run once this task is complete. • continueWithTask: This is the method that all other continuations must go through. • continueOnSuccessWith (continueOnSuccessWithTask): Enqueues a given closure to be run once this task completes with success (has intended result). • continueOnErrorWith (continueOnErrorWithTask): Enqueues a given closure to be run once this task completes with error.
- 13. Chaining tasks pattern Future/Promise on iOS 13
- 14. Chaining tasks pattern Future/Promise on iOS 14
- 15. Chaining tasks pattern Future/Promise on iOS 15
- 16. Chaining tasks pattern - continueWith Future/Promise on iOS 16
- 17. Chaining tasks pattern Future/Promise on iOS 17
- 18. Parallel tasks pattern Future/Promise on iOS 18 • whenAll : Creates a task that will be completed after all of the input tasks have completed. • whenAllResult: Like whenAll. The result of the task is going an array of results of all tasks in the same order as they were provided. • whenAny: Creates a task that will complete when any of the input tasks have completed.
- 19. Parallel tasks pattern Future/Promise on iOS 19
- 20. Parallel tasks pattern - whenAll Future/Promise on iOS 20
- 21. Parallel tasks pattern - whenAllResult Future/Promise on iOS 21
- 22. Parallel tasks pattern – whenAny Future/Promise on iOS 22
- 23. Could only go with tasks on function •continueWith •continueOnErrorWith If error occurs next task on continueOnSuccessWith will never run Errors handler Future/Promise on iOS 23
- 24. • How to create Promise from Asynchronous function • How to create Promise from Synchronous function BoltFramework Future/Promise on iOS 24
- 25. BoltFramework – Create Promise Future/Promise on iOS 25 BoltFramework/Bolt-Swift
- 26. BoltFramework – Create Promise Future/Promise on iOS 26 BoltFramework/Bolt-ObjC
- 27. • Readable code • Testable code • Component task • Re-useable code Advantages Future/Promise on iOS 27
- 28. Chaining tasks pattern - continueOnSuccessWith Future/Promise on iOS 28
- 29. References Future/Promise on iOS 29 • https://github.com/BoltsFramework/Bolts-Swift • https://github.com/BoltsFramework/Bolts-ObjC • http://www.slideshare.net/NicholasvandeWalle
- 31. Thank you Future/Promise on iOS 31
- 32. • Software Engineer at GEEKUp company: • iOS • Web • Scrum Master • love sharing & technical excellent • Website: http://thinhvoxuan.me • Github: https://github.com/voxuanthinh • Skype: voxuan.thinh whoami Future/Promise on iOS 32