我正在将 aviewDidAppear
和filter
Drivers 与 RxSwift 结合起来。他们工作得很好。但是当我介绍第三个驱动程序时,它停止调用flatMapLatest
最新的联合收割机。
在我的视图控制器中,我有这些驱动程序:
let filter: Driver<String>
let viewDidAppear: Driver<Void>
let refresh: Driver<Void>
在我的视图模型中:
// On viewDidAppear, I download a list of portfolios
let viewDidAppearPortfolios = viewDidAppear
.flatMapLatest({ (_) -> Driver<Result<[PortfolioModel]>> in
return networkService.request(Router.portfolios)!
.responseCollections()
.trackActivity(fetching)
.asDriver(onErrorJustReturn: .failure(NSError()))
})
.flatMapLatest({ (result: Result<[PortfolioModel]>) -> Driver<[PortfolioModel]> in
switch result {
case .success(let value): return Driver.just(value)
case .failure(_): return Driver.just([])
}
})
// Then I combine with a filter from my search bar.
self.portfolios = Driver.combineLatest(viewDidAppearPortfolios, filter)
.flatMapLatest { (portfolios: [PortfolioModel], filter: String) -> Driver<[PortfolioModel]> in
if filter.isEmpty {
return Driver.just(portfolios)
}
return Driver.just(portfolios.filter({ (portfolio) -> Bool in
portfolio.portfolio.localizedCaseInsensitiveContains(filter)
}))
}
以上有效!
网络请求一个投资组合列表,我可以在客户端输入时过滤这些结果。
但是,我希望用户拉刷新,并再次触发网络请求!因此,我结合了我的刷新驱动程序。
和这个:
Driver.combineLatest(viewDidAppearPortfolios, filter)
变成这样:
Driver.combineLatest(viewDidAppearPortfolios, filter, refresh)
问题!
与viewDidAppear结合后refresh
不再调用!仅当我手动 pullToRefresh 时。flatMapLatest
Driver.combineLatest(viewDidAppearPortfolios, filter, refresh).flatMapLatest { _,_,_ in
// No longer get's called on viewDidAppear after combining with refresh
}
- 仍然执行,
viewDidAppearPortfolios
所以网络请求被调用了! - 只有当我手动拉动刷新时,我才能获得我之前请求的投资组合列表......
知道为什么吗?
谢谢!