promise on ios

Future/Promise on iOS

Thinh VoXuan Summer 2016

1. Callback hell & Another problem2. What is promise ?3. Chaining tasks pattern4. Parallel tasks pattern5. Errors handler6. Example with Bolt Framework7. Advantages

AgendaFuture/Promise on iOS

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• Synchronous vs Asynchronous

Not TodayFuture/Promise on iOS

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Callback hell & Another problemsFuture/Promise on iOS

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How could I call 3 requests on same times?


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Hard to understand and follow the logic ?

What happen when 1 request has error?

What is promise ?Future/Promise on iOS

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• Deferred State• pending

• Settled State• fulfilled• rejected

What is promise ? - fulfilledFuture/Promise on iOS

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fulfilled could be•Value•Object•Another Promise

What is promise ? - rejectedFuture/Promise on iOS

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rejected could be•Error

Chaining tasks patternFuture/Promise on iOS

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• 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.


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Chaining tasks pattern - continueWithFuture/Promise on iOS

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Parallel tasks patternFuture/Promise on iOS

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• 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.

Parallel tasks patternFuture/Promise on iOS

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Parallel tasks pattern - whenAllFuture/Promise on iOS

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Parallel tasks pattern - whenAllResultFuture/Promise on iOS

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Parallel tasks pattern – whenAnyFuture/Promise on iOS

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Could only go with tasks on function•continueWith•continueOnErrorWith

If error occurs next task on continueOnSuccessWith will never run

Errors handlerFuture/Promise on iOS

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• How to create Promise from Asynchronous function

• How to create Promise from Synchronous function

BoltFrameworkFuture/Promise on iOS

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BoltFramework – Create PromiseFuture/Promise on iOS

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BoltFramework/Bolt-Swift

BoltFramework – Create PromiseFuture/Promise on iOS

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BoltFramework/Bolt-ObjC

• Readable code• Testable code• Component task• Re-useable code

AdvantagesFuture/Promise on iOS

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Chaining tasks pattern - continueOnSuccessWith

Future/Promise on iOS

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ReferencesFuture/Promise on iOS

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• https://github.com/BoltsFramework/Bolts-Swift

• https://github.com/BoltsFramework/Bolts-ObjC

• http://www.slideshare.net/NicholasvandeWalle/promisesdraft

http://www.slideshare.net/NicholasvandeWalle/promisesdraft






Q&AFuture/Promise on iOS

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Thank youFuture/Promise on iOS

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• 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

whoamiFuture/Promise on iOS

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http://thinhvoxuan.me/

https://github.com/voxuanthinh

promise on ios

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