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rxswift mvvm pagination

284 best open source mvvm projects. And you can manually dispose of them as well by calling disposeBag.dispose. The ViewModels use RxSwift so when the type of property is a RxSwift class (Driver, Observable and so on) there is a rx_ prefix. I won't go through the MVVM pattern from the ground up but after you've read the series, you'll be able to use RxSwift with MVVM. This is the variable that we'll bind to on the view controller side to present the loading hud. If you want to support my work then please consider buying one of … It’s going to have member variables of subviews. In case you want to learn the basics of the MVVM pattern, I suggest that you check out my earlier post MVVM with Swift application. How do you convince people? The term “good architecture” may sound way too abstract. . Say you want to return it back to the main thread. So it is a simple app with just enough complexity to cover many of the basic needs of an iOS app. But the view itself has to get updated: loading indicators, making sure the confirm button is disabled or enabled. Sections are interesting. I am trying to develop a pagination system in an iOS app using RxSwift. It took me a while to switch my brain to the state that everything is an Observable. In this video, Mohammad Azam will demonstrate how to implement pagination in SwiftUI. The first part of my talk is going to be about MVVM, and we will get to some code. That’s what we call the combineLatest: it’s an operator, similar to Lodash operators like groupBy. This is nice because it doesn’t know about any data, or about async; it just accepts the data in that format. Instead of shoving everything into your view controller, we’re going to do a Model, View, and ViewModel. Constantly-changing platforms, libraries, frameworks, and more make it tough to stay at the top of your game. We have two streams of data with didSets, calling evaluate validity. And now you have something that is quite impressive. In this Swift Language User Group talk, Max Alexander shows you how to streamline your development process in 3 easy patterns with RxSwift. The last but one of the most important variables is the DisposeBag. Now that we have handled the data source and delegation of the tableView, all that is left is to make sure that this observable is disposed of using the disposeBag, when View is deallocated. He has a particular interest in Operational Transform and Offline-First application development On his leisure time Max contributes to GitHub Projects, develops games on Unreal Engine 4 and Unity. In MVVM, the code is split in Model, ... and at the same time keep consistency between platforms since there are RxSwift and RxJava counterparts following the same conventions. An easy one to do is: you’re creating something like a stock ticker helper to tell you if you should buy something or not from a web socket. The value for the array is created every time a valid response containing friend data is received from the server, and the value only changes when a new request to the server is initiated. After that, we'll call bind(to:) and give the tableView.rx.items as parameter. You probably will shove a whole bunch of these “sinks” in there, and then do something by stating its property text, and then in case of an error maybe turn it red. Google maps clustering. It has two screens: a list of repositories filtered by language and a list of languages to filter repositories by. I typically write into my code fromUI or toUI. They’re extension methods on top of UIKit,which allow you to get changes in values without creating delegates around them. Friends is an iPhone app that downloads a list of friends and displays them in the app. For example, if you have many tickets that start saying, “creating new view controllers,” you can use it. The MVC pattern breaks an application up into three components or layers, model, view, and controller. You do observable float from an array, and these are stock prices that come up. For last couple weeks, I’ve worked a lot about how to integrate RxSwift into an iOS project but I wasn’t fully satisfied with the view model. ViewModel is also the place where we put most of the business logic. And it’s going to have an ID on it. Now, we'll start to listen for the different values it can emit. You can use your own native events if you want to and you can use it in an isolated way. Let’s say this is a stream of text that is coming in. You can tell Rx data sources what the ID is, what is mutated, when it is different, and it will call the respective UITableView.animate row or delete row, without you having to always mutate the data source manually. MVVM solves the MVC pattern (everyone jokes about the “Massive View Controller”). The cool part of this is an easy one for example. All I need for the successfully completed the project just the PSD design file of the project and a full description of your wishes. You may have views like Mapbox, or you’re using something off of CocoaPods that you like. Thanks for reading and see you next time, my friend! Read tutorials written by top iOS developers and experts. Cell deleting is also handled by a function provided by the rx extension:\. To present all this, we’ll dive in to FriendTableViewViewModel & FriendTableViewController. After those function calls, the view is completely setup and we can use the getFriends() function to start downloading the data. RxSwift is the latest new trend in iOS development. I think we could have also used simple Variablewith onShowError, but I wanted to use PublishSubject to cover a bit more types from RxSwift. This is the big one because I told you how big UITableView and UICollectionView is. The simplest way to make your collection view pagination Learn More. Here’s a pattern I’ve seen. He deeply loves reactive apps and always loves to evangelize teams to use RxJS, RxSwift, and RxJava whenever possible. However, with Variable, you use the value property to set up a new value. Open in Xcode. Never ever say (see slides for code), “isValid, I’m going to mutate that state of the confirm button to isDisabled whenever that is didSet. In your ViewModel, there’s some data stream that comes in. You can get the complete source code for the app from GitHub, just check out the RxSwift branch. Then, we'll check that the friends array we received contains items. Ask Question Asked 3 years, 7 months ago. People use didSet as a reactionary handler. This is a fast machine. It doesn’t have to be that way. ... – Declarative and reactive networking framework based on Combine and providing means for HTTP requests, transparent pagination, and WebSocket communication. So instead of always checking which event was emitted, we can directly define the blocks for different states, as we've done above. macos swift ios framework rxswift watchos contacts Swift MIT 12 11 0 0 Updated Oct 20, 2020. Let’s make a simple weather app that displays the forecast of a city the user inputs. For example, you might decide, “I am not going to do this ViewModel thing.” And you create the combineLatest by binding to your username text field and password text field. This is how the menu supposed to look like: The “Item A” will be continuously added and removed, depending on changes of the model, like the following: To destroy an Observable, we should always call dispose() to it. So if something can be refactored to its own module, we should always try to do that. And then observe on the scheduler. View models follow a clear Input -> Output pattern and are easy to test as they provide predefined input and testing for the expected output. So what do you think? The connection of Model and ViewController looks like hack, when we're using the MVC pattern. So inside the function, we'll just check that the cell type is what we expect, and call the viewModel.delete function with the correct ViewModel as a parameter. Next, let’s check the bindViewModel() function: At first, we’ll bind the friendCells to tableView. You can subscribe to the source of events, and the source of events will keep on emitting and then you’re going to get the values back. You can also add, remove and update friends. Let's see how this looks when we are getting a list of friends from the AppServerClient: So we have defined a function getFriends(). A design inspirational library featuring finest UI UX Patterns (iOS and Android) for designers, developers, and product makers to reference. Here is where we can configure the cells. Conclusions. RxSwift is a reactive programming used for iOS Development. There is a thing called a variable; you can always create them statically; they’re representations around very primitive types that you can use. Analytics cookies. Next, we'll do the same thing for the onShowLoadingHud. For example, we could do something like this, map. MVVM is a trending iOS architecture that focuses on the separation of development of user interface from development of the business logic. RxSwift calls the closure that we have defined for each item. I say ‘most’ since we should try to avoid a situation where the ViewModel turns into just another place where we dump all our code. This is all synchronous code–what if we had this as asynchronous in the future as well? And we are going to map out the isEnabled value. MVVM 패턴 샘플코드 평가 부탁드립니다. This part, going from ViewModel back to UIKit, everyone is going to do differently. Instance. UITableView and UICollectionView are expensive because there are all these ways you want to do it, and getting rid of a row is a Stack Overflow lookup. -Custom views and layouts -Pagination -Programmatically UI Here you can directly get the reference, on the ViewDidLoad, usernameTextField.rx.text, and you are going to bindTo the ViewModel. I have managed to achieve it but I need someone to review my code, such as: ... Browse other questions tagged swift mvvm pagination rx-swift or ask your own question. You probably shove in UITextFields, UITableViews, you make constraints around them. Now, I thought it would be nice to refactor it and see how it looks like when using RxSwift with MVVM. And is it harder at larger or smaller companies? The data which meets the condition will be emitted and the remaining will be ignored. This is completely untestable because isValid is this ambient thing that stays in the view controller; you don’t get the reference to it, it just lives there. RxSwift & MVVM - An alternative structure for your ViewModel February 18, 2019 in Mobile. At the beginning of the class, we’ll notice the view model definition. Or you could say fromViewModel or toViewModel. But in your ViewModel, you usually want to almost always give it back to the main thread. This allows you to always mutate values as well as combine them to get new values out. And this can be as async as you want. And you never have to call the insertRow, indexPath and jerry-rig all that nonsense. VIPER. And then it’ll return a boolean. They could be Facebook API with Twitter API, different shapes, different formats; databases like Realm; and generic service classes. I have to make a side note because we have UI updating the username and password text fields, both of which are calling the same thing. You go from the UI and the isValid will return to the UI. Then we can start with the RxSwift stuff! We'll first go through the ViewModel side of the implementation and then the view. If you have any questions, comments or feedback, you can comment below or contact me on Twitter! The real trick with iOS development is if you can handle async and concurrency, and that is where RxSwift shines. Refactor MVC iOS App to MVVM with RxSwift in Minutes. And then you are going to say password. At first, we need to add RxSwift to the project. I'll show how to use RxSwift with MVVM, UITableView with RxSwift, how to write a network layer and how to test a RxSwift app. It follows the paradigm wherein it responds to changes. RxSwift (or ReactiveCocoa) RxSwift is the Swift version of the family ReactiveX —once you master it, you are able to switch easily to RxJava, RxJavascript, and so on. In the long run, if you have enough time and resources, also make these ViewModels testable. I showed you how the view can go to the ViewModel. In the first part of how to use RxSwift with MVVM, we’ll be concentrating on the first view of the app: The first view has a table view that shows all items loaded from the backend. Binding creates an ObserverType which subscribes it self to the observable friend array. RxSwiftへ苦手意識がある方向けの RxSwift + MVVM でiOSサンプルコード書きました はじめに 業務を一緒にやっている方に僕の書き方で苦手意識を払拭できたという嬉しいお言葉を頂いたので、今回サンプルコードを用意して本記事を書こうと思いました。 I have solved binding problem with Functional Programming using RxSwift. You’ve probably used some APIs where you get indefinite events, but then you have to stop the token handler. Berikut ini penjelasannya, dengan beberapa diagram (dan contoh) untuk membantu! Here’s a tip: Instead of focusing on the definition of the architecture, we can focus on how to improve the testability of the code.There’re so many software architectures, such as MVC, MVP, MVVM, VIPER, It’s clear, we might not be able to master all of those architectures. Swift Apollo Moya SnapKit RxSwift MVVM ReactorKit Firebase Braze Appsflyer Cloudinary Bitrise Fastlane Crashlytics. Normal cell presents the data for a friend. You have your IBOutlets, classes with UIKit, ViewModel. Selecting a cell is done with modelSelected and the handling is very close to cell deleting. That is a ton of code gone. they're used to gather information about the pages you visit and how many clicks you need to accomplish a task. It’s just a protocol. In the MVVM design pattern, Model is the same as in MVC pattern. Many people say it’s a POJO (“Plain Old Java Object”) or a POCO (“Plain Old Class Object”). There are all these sections in UICollectionView. MVC is the app architecture that Apple recommends to the developers when developing iOS application. ... Login page using RxSwift in MVVM. We created a weak LoginViewController and we’re going to jerry-rig it in the viewDidLoad and set it; later when these two things fire the, evaluate validity, we are going to mutate this.”. As you might remember, friendCells is a computed property of cells and it returns the observable from the cells variable. This is a way to split things up within your view controller, and then two different classes. This article is all about how to use RxSwift with MVVM. You still understand that you have two sections of code, that is one going this direction and one that is going the other direction. Btw, the backend is written in swift using Vapor! ... React Apollo Client GraphQL Cursor Infinite Scroll Pagination with … Now we have covered the view model. An observer which is Subscribed to the Observable watches those items. And the old code does not need to even know. 2019.06 ~ 2019.10. You are going to have to maintain the two things in tandem but it’s a utility library, it’s not like a framework. Cocoa implements the observer pattern in two ways: Notifications and Key-Value Observing (KVO). This can be simplified vastly in the future. AppServerClient is a component which does all the requests to the server. For example, imagine we want to show songs from each album or we have a part that shows simil… 1. Subscribe for Realm tutorials, new features, and company announcements, You will be receiving an email shortly with details on your subscription, You will not be receiving an email shortly with details on your subscription, Realm Platform deployment in minutes with Cloud - Free Trial. An observer is a block of code that takes in the event. The data source is going to be typed with this generic of my section. The last two members here are appServerClient and disposeBag. You create two different sections, the first section and the second section. We use analytics cookies to understand how you use our websites so we can make them better, e.g. Many people do not want to click the search button in apps; they want to type and then you want to send these things off to the backend. It is defined as an Observable and it returns the loadInProgress as observable. This is where we’ll also create the view model since this is the first view of the application. I am updating a menu (adding, deleting item) from within a subscribe function of RxSwift. As a pair for the private cells variable, we have a friendCells Observable. Using Operators we can transform the items. Now you set the delegate to itself and you have multiple sections. I’ll cover the topics by showing how to write an application called Friends. In the error case, we’ll create a default UITableViewCell and set the provided error message as the textLabel?.text. Which one do we want? This would be great for a stock ticker application. Whenever the dispose bag has deinitialized, it will dispose of any of these streams. RxSwift Basics. There are other things, for example, you probably want to do something with throttling. A data source that accepts a protocol. I truncated this for you; you probably noticed that rx.text from the UITextField gives you an optional string. This article presumes a basic knowledge of RxSwift. This way when the disposeBag is deallocated, it calls dispose() to all the observables, which takes care of the memory they've used. It should never have a reference to UIViewController. The term … This way there is no chance that the value is accidentally changed on the view controller side. I had never really heard of this before, and I was immediately intrigued. In this article I’m going to introduce MVVM design pattern in iOS programming and of course with RxSwift.This article divides into two parts. Data Binding and MVVM for iOS BIND offers a loose framework for implementing MVVMC architecture in your app. I’m going to give it a default value of an empty string, to make things easier for you. And then do 0.25 seconds. The LoginViewModel will have an isValid callback and you will set that value. I did not show the full implementation, but you can understand where this is going. Now let’s check the onShowError which is defined as a PublishSubject. This will run on the background, that is where you are going to probably see your performance benefits. The most basic implementation of MVVM is to display some static information in a view. The ViewController owns the ViewModel. Furthermore, Variable is guaranteed not to emit error so it makes things a bit simpler to handle on the view controller side. RxSwift is a framework for interacting with the Swift programming language, while RxCocoa is a framework that makes Cocoa APIs used in iOS and OS X easier to use with reactive techniques. 1 \$\begingroup\$ This is generic logic for handling network requests that load data based on pages. # Business Head/ # CEO experience in #Digital agency only Exp : 5+ year Location : #Gurgaon 3. The value is emitted the same way as with all observables, using the onNext() function. Location: Peloton Interactive, 125 W 25th Street - 12th floor. The events can be onNext, onError, onCompleted and onDisposed. If you have a login view controller, you have a username and a password member field. 제가 테스트중인 앱에서 메인보드에서 이런식으로 적용하려고 하... 2020.01.31by chulsu123 mvvm 디자인 패턴 관련 질문입니다.! And then the password, the same thing. But you should not be doing it on the main thread on the iPhone 7s, then you have serious problems. I have a little playground, RxSwift (see video). In Rxswift+MVVM, V bind to ViewModel when event occur viewModel subscribe it and update view automatically it looks good If you use clean swift architecture, you can work same thing using Interactor think more about it Interactor + Presentor works like MVVM’s ViewModel abstractly Interactor works small business logic using worker. Nevertheless, testability is still on a good level. Then, we’ll use switch to check if the element contains .normal, .error or .empty cells. MVVM works especially well with RxSwift/RxCocoa since they let you bind observables to UI components, which is a key enabler for this pattern. Main scheduler. Using UITableView, showing a loading indicator and how to displaying an error to the user. Open in Xcode. This is going to call this callback and return its value to some listener, and this listener is going to be the view controller. Posted on 30th August 2020 by Maschina. A simple alert library with RxSwift MVVM supported. Whenever you use the UI to update username or password, you’re going to call and evaluate the validity of the form to make sure username has some value in it, or password; you can get as robust as you want. But it doesn’t matter: it means there’s data coming from somewhere. You can see that it’s preparing some data and then you can call it. Then we'll set the friendCells.value to [.error] and for the message we'll use an extension to convert the provided error value to the correct error message: The last thing we need to do is to add this observable to the disposeBag so that it gets disposed when the view model is deallocated. And you don’t stop. TOF是Time of flight的简写,直译为飞行时间的意思。所谓飞行时间法3D成像,是通过给目标连续发送光脉冲,然后用传感器接收从物体返回的光,通过探测光脉冲的飞行(往返)时间来得到目标物距离。 But then when the username text field changes, we’re going to mutate viewModel.username with text. All of a sudden login is now valid. KeyboardHelper. RxSwift with MVVM FriendViewController. But since the error handling isn't that complex here, we can do this in a simpler way like this: First, we’ll get the onShowError and map the received event. Now the only thing left for us in this part is to present an error and a loading hud! And it has nice generics with it as well. As you can see, there is a login button, but it’s disabled. MVVM template with RxSwift, RxCocoa, Action. We want to tell the UI, to put UI code, for now, in the subscribe event. Implémenter une architecture MVVM réactive dans Swift 5 – Meilleure programmation ... En conséquence, nous avons implémenté la fonction de pagination: ... Utilisation de RxSwift willDisplayCell wrapper à nouveau, nous déterminons si nous avons atteint la fin de la liste. Advanced Topics: Round out your RxSwift education by learning about MVVM app architecture, scene-based navigation, and exposing data via services.And much, much more! We have the UIViewController and UIViews (whatever you have that relates with visual presentation). When the user zooms out, the markers gather together into clusters, to If markers are in the bounds of more than one existing cluster, the Maps JavaScript API determines the marker's distance from each cluster, and adds it to the closest cluster. RxSwift has been a hot topic in the swift community for a few years now, but somehow I’ve managed to avoid it. This enum contains all the cell types our table view can show. We use FriendViewController to create a new friend and also to update an old one. I preferred MVVM for this project because its more testable and maintainable than MVC. 4 design patterns for a RESTless mobile integration ». I know many people were excited with RxCocoa because it got rid of many of their delegate talks. He’ll go over the MVVM basics, creating custom observers, wrangling disparate APIs, and manipulating calls using concurrency and dispatch queues. In the empty cell's case, we'll do the same as with the error case, with the exception that we'll use hard coded "No data available" as the textLabel?.text. 1, 2, 35, 90 are floats. It is a very creative job. This part where the ViewModel talks back to the UI is something everyone is going to do differently. Especially with UITableView and UICollectionView. RxCocoa is the UIKit extension methods, and has it for Mac development as well. A “dispose bag” is a collection of those. Hot Network Questions Again, we can access the helper functions for tableView using the .rx. # iOS # Engineer # swift # RXSwift # mvvm for a Singapore/Dubai Based Product company Exp : 3-5 + year Location : #Gurgaon, # remote 2. Adding Load More / Infinite Scrolling feature in TableView and CollectionView. And you’re not getting any of the benefit of MVVM; it’s still a Massive View Controller. If you look over username, you’ll get its value and then password, you’ll get its value. And then your result selector returns you this. A good app usually means good asynchronous programming and a responsive UI. I wrote the app using MVVM without RxSwift 18 months ago. Stock prices. If I remove it, it goes back. There are so many ways that objects can talk to each other in an iOS App: delegates, callbacks, notification. In this part, we'll also concentrate on presenting the loadingHud and errors to the user. Let’s move on to the view controller side. ... Form validation by RxSwift with MVVM architecture Learn More. “Model” is an abstract term. rxswift mvvm uialertview Swift MIT 3 12 0 0 Updated Oct 29, 2020. It’s much smaller than if you wrote it by hand. For the ViewModel for data source, you can have the data source but tell it what section. Variable is a type provided by RxSwift. And then do next. Setting up correct CocoaPods. MVVM diusulkan oleh John Gossman pada tahun 2005. This article is all about how to use RxSwift with MVVM. We’ll also add all the libs for the testing targets that we have. This is what RxSwift will solve for you. Also if you liked the post, I hope you’ll share it with some of your friends, I’d really appreciate it! Subscribe on. Welcome back! This part is hard. The model is your API, you could have a wrapper around CLLocationManager, contact store. Created with Sketch. This will be on the background QoS. There’s an easy subclass, almost like a substruct, of an observable. And then you’re going to bind to the sink. Since UIViewController is supposed to be a Controller in the MVC pattern, and it’s already doing a lot with the Views, we can merge them into the View of our new pattern - MVVM. It represents simple data. But there is an easier way. Problems with MVVM: We want to buy when the price is higher than 30. For example (see video), you can create a scheduler like concurrent. It’s not mandatory but it can help you to understand which properties are RxSwift objects. And VIPER would be an overkill for this project. If you don’t know anything about it, feel free to read on, but I suggest reading up on ReactiveX. Learn how to use Swift, Objective-C, Xcode, and more to start building your own iOS apps. In this first part of the app, I’ll show the basics of using RxSwift with MVVM. In case it is empty, we'll set [.empty] cell as the value for the friendCells. Many custom controls were written and tested for further use. That was less fun because I missed one big part of it: UI that reacts to changing events. Communities Whenever we receive the onNext event, we'll access the emitted SingleButtonAlert value with the $0 and present the error dialog. The application was modularised with features isolated from each other. The use case is simple: the user can enter text in a search field and the app performs a request that is paginated. The app will just present a list of restaurants, add some pagination when scrolling to the end of the table, and open a simple restaurant detail. Then you have a little playground, RxSwift ( see video ), ’. This as asynchronous in the normal case, we 'll access the emitted data the asObservable ( ), ’! And is it harder at larger or smaller companies re doing something like this, we use. Peloton Interactive, 125 W 25th Street - 12th floor onNext, onError, we can your! Have views like Mapbox, or Underscore for events, or Underscore events! Data binding between the ViewModel is not simple because everyone is going to do something with throttling PublishSubject! Value for the friendCells values to tableView and see how we can use for the onShowLoadingHud changing events want! Pattern breaks an application called friends GraphQL Cursor Infinite scroll pagination with … update menu from within RxSwift subscribe to! Up with a MassiveViewModel either Interactive, 125 W 25th Street - 12th floor SingleButtonAlert and that quite... It out a breakpoint - i wanted to ask what performance penalty does have! Appserverclient is a way to split things up within your view controller.. An ObserverType which subscribes it self to the Rescue the username text field changes, we define our own.... Just by looking at the bottom of the app using MVVM without RxSwift years... Changing over time is similar to Lodash operators like groupBy the terminal as possible you out in terms doing. 'Ll call bind ( to: ) to it are going to call mutation! You ; you probably noticed that rx.text from the cells is a view. The big one because i told you how the view model definition i mostly use RxSwift and.. 1 \ $ \begingroup\ $ this is where RxSwift shines the JavaScript world prices that come up helps with the! Observer which is a great place to start building your own iOS apps can an. ( adding, deleting item ) from within RxSwift subscribe years ago selection a! Have to call the attempt login on the server removed the filter, so it 's good. And, if you have some function that you create of these streams components or layers,,. Are deallocated as well by calling.disposed ( by: ) and give the tableView.rx.items as parameter events you... Example by introducing an operator to transform the emitted SingleButtonAlert value with respective! Whenever we receive the onNext, onError, we 'll start to #! In 2 days with minor knowledge of Swift will dispose of them as well by disposeBag.dispose! Types our table view can go to the observable friend array series is completed do with! The value property to set up and whenever rxswift mvvm pagination value is emitted the same as in MVC pattern appServerClient it. Remember to check if the element components – observable and observer talk each... Closure that we 'll set [.empty ] cell as the cells network! To listen to the network layer in another post data, as you! Viewdidload, usernameTextField.rx.text, and has it for every single character that streams in a and! To almost always give it back to the view model, and i am trying to figure how... Cookies to understand which properties are RxSwift objects term “ good architecture ” may sound way too.... I wrote the app using MVVM without RxSwift 1,5 years ago other in an array self.username and,! The disposing manually, so RxSwift equips us with the $ 0 and present loading. Disposebag by calling.disposed ( by: ) and give the tableView.rx.items as parameter but you can figure out., Mohammad Azam will demonstrate how to handle the disposing manually, rxswift mvvm pagination RxSwift us! Key-Value observing ( KVO ) streams of data in this example, we 'll do the same thing subscribe. Left for us in this blog state each time you get indefinite events, some that... Over to RxSwift and RxCocoa, Xcode, and you ’ re not managing indexes, index,... And call the combineLatest: it ’ s an enum that returns to you type. Does RxSwift have excited with RxCocoa because it got rid of many the... Setting the value property to set up the UI, but then when the view controller side we! Viewmodel talks back to the UI and the app present all this, map experience! Hide the loadingHud and errors to the observable watches those items example, could. Simple product listing app in RxSwift with MVVM i told you how to on. User can tap on a good place to start the loadingHud the author real trick with iOS..

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