[英]RXSwift - How to recall an api
i created an observable for an api call and bind to a tableview. 我为api调用创建了一个observable并绑定到tableview。 Now i am unclear how to call the same api once again?
现在我不清楚如何再次呼叫相同的api? so as to do a refresh - say on an button click?.
以便刷新 - 比如按一下按钮? The following is my sample code.
以下是我的示例代码。
Please let me know your thoughts it will be helpfull 请让我知道你的想法,这将有所帮助
var items : Observable<[String]>?
func viewDidLoad(){
items = fetchAllAnswers()
items.bindTo(....).addDisposableTo(bag)
}
func fetchAllAnswers() -> Observable<[String]>{
let api = Observable.create { (obsever: AnyObserver<[String]>) -> Disposable in
let answers = API.allAnswers()
obsever.onNext(answers)
obsever.onCompleted()
return AnonymousDisposable{
print("api dispose called")
}
}
return api
}
func onClickRefresh()
{
// how to call api here again?
// let items = fetchAllAnswers()
// items.bindTo(....).addDisposableTo(bag)
}
it's simple. 这很简单。 You may to use Variable for update your items:
您可以使用变量来更新您的项目:
let items = Variable([String]())
Next you must to bind items with your UITableView: 接下来,您必须使用UITableView绑定项目:
items.asObservable.bindTo(....).addDisposableTo(bag)
Next you may to update your items in subscriber: 接下来,您可以更新订阅者的项目:
fetchAllAnswers()
.subscribeNext { stringArray in
items.value = stringArray
}
.addDisposableTo(bag)
If you want to update your table by button click, you may to do next: 如果您想通过按钮点击更新您的表格,您可以做下一步:
yourButton.rx_tap
.flatMap { void -> Observable<[String]> in
return fetchAllAnswers()
}
.subscribeNext { stringArray in
items.value = stringArray
}
.addDisposableTo(bag)
func viewDidLoad() {
button.rx_tap.startWith().flatMap { _ in
fetchAllAnswers()
}.bindTo(...).addDisposableTo(bag)
}
flatMap
will transform taps to the result of the observable the closure returns, here a String
array. flatMap
会将tap转换为闭包返回的observable的结果,这里是一个String
数组。
startWith()
will force rx_tap
to emit a first value at subscription time, so that the first refresh behavior is kept. startWith()
将强制rx_tap
在订阅时发出第一个值,以便保留第一个刷新行为。
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