ios – 用于搜索屏幕的MVVM和RxSwift

概述为了教育MVVM和Rx Swift我想构建简单的搜索屏幕,它将有一个表格视图和一个搜索栏.当用户在搜索栏中输入内容时,我将在此表中显示他所拥有的内容.听起来很简单,但我找不到任何适合我的教程. 我已经在视图控制器中编写了所有代码,我只是无法理解必须观察搜索文本的变化然后调用数据库方法,这将通过搜索文本过滤项目. 一些代码,我已经有了. 我的ViewController import Foundat 为了教育MVVM和Rx Swift我想构建简单的搜索屏幕,它将有一个表格视图和一个搜索栏.当用户在搜索栏中输入内容时,我将在此表中显示他所拥有的内容.听起来很简单,但我找不到任何适合我的教程.

我已经在视图控制器中编写了所有代码,我只是无法理解必须观察搜索文本的变化然后调用数据库方法,这将通过搜索文本过滤项目.

一些代码,我已经有了.

我的VIEwController

import Foundationimport UIKitimport RxSwiftimport RxCocoaclass PlaceSearchVIEwController: UIVIEwController {    //MARK: -     @IBOutlet weak var searchbar: UISearchbar!    @IBOutlet weak var tableVIEw: UItableVIEw!    //MARK: - DependencIEs    private var viewmodel: PlaceSearchviewmodel!    private let disposeBag = disposeBag()    //MARK: - lifecycle    overrIDe func vIEwDIDLoad() {        super.vIEwDIDLoad()        viewmodel = PlaceSearchviewmodel()        addBindsToviewmodel(viewmodel)    }    //MARK: - Rx    private func addBindsToviewmodel(viewmodel: PlaceSearchviewmodel) {        searchbar.rx_text.bindTo(viewmodel.searchTextObservable)        viewmodel.placesObservable.bindTo(tableVIEw.rx_itemsWithCellFactory) {            (tableVIEw: UItableVIEw,index,place: Place) in            let indexPath = NSIndexPath(forItem: index,inSection: 0)            let cell = tableVIEw.dequeueReusableCellWithIDentifIEr("Cell",forIndexPath: indexPath) as PlaceCell            cell.configureWithObject(place)            return cell            }            .adddisposableto(disposeBag)        tableVIEw.rx_contentOffset            .subscribe { _ in                if self.searchbar.isFirstResponder() {                    _ = self.searchbar.resignFirstResponder()                }            }            .adddisposableto(disposeBag)    }}

我的观点模型：

import Foundationimport RxSwiftimport RxCocoaclass PlaceSearchviewmodel {    //MARK: - DependecIEs    private let disposeBag = disposeBag()    //MARK: - Model    private let placesObservable: Observable<[Place]>    var searchTextObservable = Variable<String>("")    //MARK: - Set up    init() {        placesObservable = searchTextObservable.asObservable()            //wait 0.3 s after the last value to fire a new value            .debounce(0.3,scheduler: MainScheduler.instance)            //only fire if the value is different than the last one            .distinctUntilChanged()            //convert Observable<String> to Observable<[Place]>            .flatMapLatest { searchString -> Observable<[Place]> in                // some code here which I can't write.            }            //make sure all subscribers use the same exact subscription            .shareReplay(1)    }}

另外,我有方法[DataBase searchPlaces：searchText]返回地方数组 – [Place].我无法理解在我的viewmodel的flatMapLatest中放置它的位置和方式.

解决方法 我通过创建Observable< [Place]>为我的DataBase创建反应性包装器.

这是我的代码

placesObservable = searchTextObservable.asObservable()            //wait 0.3 s after the last value to fire a new value            .debounce(0.0,scheduler: MainScheduler.instance)            //only fire if the value is different than the last one            .distinctUntilChanged()            //convert Observable<String> to Observable<Weather>            .flatMapLatest { searchString -> Observable<[AnyObject]> in                return TPReactiveDatabase.sharedInstance.searchPlacesByTitle(searchString)            }            //make sure all subscribers use the same exact subscription            .shareReplay(1)

和包装器方法searchPlacesByTitle

class TPReactiveDatabase: NSObject {    static let sharedInstance = TPReactiveDatabase()    // MARK: - Reactive Place database    func searchPlacesByTitle(Title: String) -> Observable<[AnyObject]> {        return Observable.create { observer in            var places = [AnyObject]()            if (Title.characters.count > 0) {                places = dbaccessKit.searchPlacesByTitle(Title)            }            observer.on(.Next(places))            observer.on(.Completed)            return Anonymousdisposable {            }        }    }}

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