rxswift combinelatest not working

I think we all agree your code is the most readable one. RxSwift needs a Binder / ObserverType to bind to. I've been working with RxSwift for a few years now, and am starting to explore Combine with SwiftUI and am having some trouble trying to replicate some functionality from RxSwift in Combine. Yeah, that was my initial try, which I thought should work, since this does: I think that Swift compiler is just being little drama queen with && :), I think that when Swift compiler becomes little more mature, it will also be be able to compile. As stated before, the idea is to grab only the first element of the fbTokenChangeNotification observable and apply combineLatest with someOtherObservable. In WWDC 2019 Apple introduced their very own FRP framework, making it… All of the operators that enter this project should not only be thoroughly unit tested but their code validity should be proved. It would be cool if we had a combineLatest that took two (or whatever) Observable (or comparable or whatever) and returned an Observable<(Bool, Bool)>. RxSwift and RxCocoa are part of the suite of ReactiveX (Rx) language tools that span multiple programming languages and platforms. As you can see, I’ve used the most recommended traits for representing http request, if you’re not familiar with them, please take a look here: Combine, ReactiveSwift, RxSwift withLatestFrom (source), I don’t think most people in this audience have the luxury of starting an app from from new. RxSwift Combining Operators: combineLatest, zip and withLatestFrom zip operator combine the emissions of multiple Observables together via a specified closure and emit single items for each //withLatestFrom slower than source. DisposeBag: In RxSwift there is a concept of DisposeBag which accumulates all the disposables and call the dispose method when the DisposeBag object gets deallocated. pipe (//both sources must emit at least 1 value (5s) before emitting. Introduce it selectively. My understanding of merge is that it emits items even if one of the observables involved is completely empty (in other words, they are not dependent on each other). You guys are dealing with five years, six years of different codebases. I'm also glad to have someone with a ReactiveCocoa background on-board here. Then, there is also confusion with Rx and operator. Swift gives us an opportunity to do something safer with the type system. Already on GitHub? If we don't have that clearly defined, people will be confused. Sometimes I'm going to not know the ReactiveX jargon that would describe my question. Nhóm toán tử đề cập đến lần này là Combining Operators.. Dành một chút thời gian để quay về các khái niệm cơ bản của Operators trong RxSwift. take(1) takes the first item emitted by an observable then completes. Tried it myself this morning and it looks like it's not working :(. The framework provides a declarative Swift API for processing values over time. The Clarke’s third law says: Any sufficiently advanced technology is indistinguishable from magic. Combine is a new framework by Apple introduced at WWDC 2019. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. What should it contain? We’ll occasionally send you account related emails. If the sequence is not finite then it can cause memory leaks if the resources are not deallocated hence it’s very important to release the resources by adding it to the DisposeBag. The biggest help I need here is actually proving that operators behave like they should in RxSwift. This is where we'll probably have biggest discussion regarding APIs. There isn't much room for being creative here. Short description of the issue: Observable.combineLatest(Collection) with an empty Collection does not complete. To do so, you have to call dispose() on Disposable which is an output from subscribe.Usually, you have more than a one Rx subscription inside … I am not sure what to make of this! In this article, I want to answer for few question like what is the DisposeBag, Disposable and to talk generally about ARC memory management with RxSwift and how to protect yourself from memory leaks while using RxSwift. However, you have to break the retain cycle at some point. The text was updated successfully, but these errors were encountered: I'm assuming one of the observable sequences sent error and disposed everything. ... RxSwift has 2 functions to combine item from one Observable with latest item from other Observable. Basically, it is how RxSwift handles memory management on iOS platform. You signed in with another tab or window. What actually happens: The Observable does not complete. You signed in with another tab or window. The other significant... Read more » I'm working on an iOS application adopting the MVVM pattern, using SwiftUI for designing the Views and Swift Combine in order to glue together my Views with their respective ViewModels. Every subscribe creates a retain cycle inside Rx’s logic. I really feel it's better not including it right now in RxSwift because of the mentioned reasons. In one of my ViewModels I've created a Publisher (type Void ) for a button press and another one for the content of a TextField (type String ). Your suggestion seems to have gotten me a little closer. I think the real question here is what is the definition of RxSwift project. Maybe I should revise it in future if it becomes inadequate. Making PRs to get merged here should be a lot easier because integrations are pretty simple, they usually rely on reusing building blocks from RxSwift. I'm having this issue as well even though I am not using Carthage. Wrapping up! Just defining your own operator locally. And we need to figure out how to allow users to write readable code. Here are existing options that are kind of equivalent of those. Do not hesitate, RxSwift will be as comfortable as Combine to use. I am working on RxSwift and started creating few basic. no, Level of RxSwift knowledge: to your account. ... Competitor-reviews” and funneled all of my competitors app reviews to that channel, allowing me to easily see what is working and not working for the other apps in my space. Something I liked from ReactiveCocoa 2 was the and operator, which operated on two signals sending NSNumbers wrapping BOOLs. The introduction to RxSwift you've been missing. I am opening issues as I encounter things that I'd like to see but can't find, and I'm coming from a ReactiveCocoa-only background. By clicking “Sign up for GitHub”, you agree to our terms of service and Sign in My understanding of merge is that it emits items even if one of the observables involved is completely empty (in other words, they are not dependent on each other). Hope you've enjoyed this quick rundown of some of the most interesting features and updates to RxSwift 6, but it's not all that was fixed. Note: Last but not least, combineLatest completes only when the last of its inner sequences completes. I appreciate being pointed in the correct direction. As a side-note, linking to relevant documentation or describing how And/Then/When work would be far more helpful than shutting me down by telling me what I'm looking for isn't important. GitHub is home to over 50 million developers working together to host and review code, manage projects, and build software together. Question or problem with Swift language programming: I have defined: let currentHours:Variable = Variable(0.0) let currentRate:Variable = Variable(0.0) and I would like to make an Observable with combineLatest to sum these two value: Observable.combineLatest(currentHours, currentRate, { (h, r) -> Float in return Float(h+r) }) and I also try: let c = Observable.combineLatest… Not all observables emitted Rx operator that starts like combineLatest but then acts like withLatestFrom Observable.CombineLatest bind and subscribe RxSwift RxSwift Combining heterogeneous observables Observable doesn't receives events Combine 2 PublishSubject's and emit with Observable.combineLatest How Does RXSwift combineLatest Use, What Looks Like, … Be aware that combineLatestwill not emit an initial value until each observable emits at least one value. This allows easily linking against a prebuilt copy of RxSwift without worrying about forward compatibility when upgrading to the next version of Swift, thanks to binary module stability. It is a core part where its magic happens. Only the first merge (with an empty observable) performs as expected. RxSwift is all about working with and mastering asynchronous sequences. You are correct, the code that you've written has really awesome readability. On the other hand, I do need some way of deciding what should enter RxSwift library. If you look at commit history, it slowly crawled into RxSwift core. You can trace all events for sequence by using debug operator. Last few months were for me my personal RxSwift bootcamp. Sign in In the previous article, we found out the basic object of the RxSwift, an Observable. Copy link Collaborator sergdort commented Jan 4, 2016. (I like your rx_subscribeEnabledTo suggestion BTW.). The reason why I feel it's so valuable is because it's probably the most common way of optimizing cold observables for performance. privacy statement. Probably someOtherObservable. Having said that, I do see great value for external independent projects that provide common convenience Rx operators optimized for specific use cases or operators that ease the transition from other reactive frameworks. If I include this, I don't have to include 40 more functions, just 10 :). Strange, because the merge result in the second example should always emit something if more than one notification was sent, regardless of whatever observable it is merged with. Below is my code, please let me know what I … RxCocoa should contain default out of the box integration with Foundation/Cocoa/UIKit environment. It seems not working for me. If I add boolean and operator, then I should probably add all 10 overloads for all combinations of arguments, even though it's not really realistic that somebody will be using and for 10 boolean arguments :), And what's worse, I should probably add or, and xor and possibly some others too :). RxSwift Combining Operators: combineLatest, zip and withLatestFrom. Chào bạn đến với Fx Studio.Bài viết này vẫn là chủ đề liên quan tới các Operators trong thế giới RxSwift. @kzaher I think the existing workarounds you pointed out are good approaches until swiftc catches up :) Thanks! I have multiple versions of Xcode installed: Hmm, I see that. I want to be able to talk with other teams in the same common language, and read code in other languages. However, I am running into a situation where the result of a merge is an observable that never emits items, even when one of the original observables IS emitting. This operator is best used when you have multiple, long-lived observables that rely on each other for some calculation or determination. const example = secondSource. Max: A lot of the guys who contribute to RxSwift say you should live and breath RxSwift from the day one your project happens. It's really similar to translating math books :) single errors out if the observable emits more than one item. I was really having a hard time fighting this one out. I have a small code base. It does not by default operate on any particular Scheduler.. Javadoc: combineLatest(List,FuncN) Javadoc: combineLatest(Observable,Observable,Func2) … At least, such is my understanding. yeah, theoretically this should work and I really thought this does work (I could have swore that I've tried that once), but don't think swift compiler is polished enough. If somebody proves to me that I've missed some case for some operator, and makes a PR to fix that edge case, that has extremely high value for this project, will have my gratitude and PR will be merged immediately. Something like: Then we can also have operators like and and or. While ReactiveX started as part of the .NET/C# ecosystem, it’s grown extremely popular with Rubyists, JavaScripters and, particularly, Java and Android developers. Thanks to it you don’t have to keep a strong reference to the button.rx.tap observable in above example. Swift compiler is still delicate peace of software, so I'm afraid adding more overloads will even make it behave worse. Successfully merging a pull request may close this issue. Successfully merging a pull request may close this issue. RxSwift Combine Notes; amb() asObservable() eraseToAnyPublisher() asObserver() bind(to:) assign(to:on:) Assign uses a KeyPath which is really nice and useful. I have added new button however with rx_tap subscribe not working for button action. Unit tests are necessary and extremely useful, but they don't prove correctness, and especially not in multithreaded environment. to your account. By clicking “Sign up for GitHub”, you agree to our terms of service and You are right that AFAIK, and/then/when have not been added to this library yet so asking for one of them makes a lot of sense. RxSwift needs a Binder / ObserverType to bind to. This work is inspired by The introduction to Reactive Programming you've been missing from @andrestaltz.I recreated his RxJS sample code in RxSwift with a step-by-step walkthrough for those struggling with learning RxSwift due to lack of good references (as I did). Any future notifications by fbTokenChangeNotification should always be observed). Until then, maybe it would be better to temporarily do small workarounds like you've done? Right now it's just an alias for replay(1) >- refCount, but since it's probably going to be used often, having a single place where I can apply optimizations in future for everybody is valuable enough IMHO to include it there. RxSwift is awesome and powerful and saves a lot of developer life and effort, can used in : 1- Bindings. The foundation of the entire project. On the RxSwift GitHub there is an example in a file called ActivityIndicator.swift. Swift NSUserNotificationCenter didActivateNotification not working January 9, 2018 Swift Leave a comment Questions: I’m working on a swift os x application and I’m having trouble understanding the userNoticiation / didActivateNotification structure. Both merges should be emitting items when the "fbTokenChangeNotification" emits more than one item. Already on GitHub? The third options is to do something that you've done. RxSwift should be the purest core of the system. Which lets developers write code like this: Now, this gets kind of crazy since ideally you could have an arbitrary number of bools in your tuple of Bools. Have a question about this project? Basic examples of this can be seen in example three, where events from multiple buttons are being combined to produce a count of each and an overall total, or a calculation of BMIfrom the RxJS documentation. Cool, sounds awesome. I'm quite excited to see a variety of FRP libraries for iOS and OS X! We're all in this together , Sorry Ash, it wasn't my intention to shut you down. Expected outcome: The Observable completes immediately. RxJava implements this operator as combineLatest.It may take between two and nine Observables (as well as the combining function) as parameters, or a single List of Observables (as well as the combining function). We could use an array or set or some other internal data structure – but I think abstracting away the logic of &&ing a bunch of Bools together into an expressive function would be in the spirit of FRP. RxSwift uses quite a lot of operators utilizing reactive patterns. (Here's a link for anyone else looking.) Other than that, the issue has been resolved. Replacing single() with take(1) seems to have fixed this error for me, though frankly I am uncertain as to why, as I understand them to be the same thing. (for the sake of completeness, the idea behind this construction would be that the first item emitted by fbTokenChangeNotification is only observed if the second observable emits an item. Thanks for the reply, it's much appreciated! This is the same behavior as … RxSwift Combine Notes; amb() asObservable() eraseToAnyPublisher() asObserver() bind(to:) assign(to) Assign uses a KeyPath which is really nice and useful. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. We’ll occasionally send you account related emails. Which indicates that the fbTokenChangeNotification.single() observable is somehow malfunctioning, I suppose? Combine Swift Jun 25, 2019 May 06, 2020 • 7 min read Getting started with the Combine framework in Swift. I agree that priority should be placed on standard stuff, but I don't think you understood my question. What is it's purpose (also the same for RxCocoa project). The text was updated successfully, but these errors were encountered: ReactiveX already has and/then/when. This is where consistency doesn't matter so much because this is platform specific code, but having some consistency would be good idea. In this case, it looks like the And or Zip operators might do what I'm looking for, which is great. I am trying to use combineLatest and merge together. So here is what I'm thinking. Because of all of this, it will probably be a lot harder to make PRs for bigger features (like operators), but easy for bugfixes (although I'm hoping there shouldn't be many serious bugs because of all of the measures :) This has it's drawbacks, but believe me, porting those operators is tedious and exhausting work. Reason why I would want that is because if some mathematical abstraction works on so many different platforms and environments (native clients/servers/web clients), it's reasonable to assume that it will work on one more. Before that, it keeps sending combined values. RxSwift has been around since 2015 and widely known among Apple developer community as an efficient open-sourced FRP library. It will ofc also include basic platform scheduler implementations. I would rather see all the standard operators first, before starting on custom ones. If you are interested in having your favorite Combine operators in RxSwift, take a part in this issue. I think it's awesome that you can in 10 lines of code create something that is so much more readable for particular use case, and I do see great value of sharing those modifications, but I would just want to be careful where to include them. Have a question about this project? It will also possibly contain convenience functions that we can't live without and that provide significant value for future optimizations (I really think that variable/sharedWithCachedLastResult is that function). We need help outlining the differences and likenesses between the two libraries. So these are reasons for and against as I see them. I'm still setting up my new computer so I can't test this myself right now, but can't you already do something like this? I am trying to use combineLatest and merge together. It's responsibility is to provide highly optimized basic sequence operators. This seems to me like a possibly useful thing to have, it's well defined and can be considered as adapted combineLatest operator version in context of swift. But, that’s not realistic. This is how I see their responsibility right now. Tagged with swift. I think we all bring a unique perspective on things and I'm really thrilled to have the opportunity to work together on such a nascent, but important library. I started with the research with the MVVM-C and RxSwift but to be honest it made me feel like I’m at the start of iOS programming. But you’ll often need to make order out of chaos! privacy statement. You also have consistency between platforms.
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