我正在尝试创建一个searchBar,它通过带有请求的MKLocalSearch搜索地址,并使用RXSwift并绑定到RXCocoa
到目前为止,我已做了以下工作 1.过滤和去抖以避免过多的请求:
let searchRes = searchBar.rx.text
.orEmpty
.filter { query in
return query.characters.count > 4
}
.debounce(1, scheduler: MainScheduler.instance)
生成的String查询是map:ed以创建MKLocationSearch,然后是flatMapp:ed以返回MKMapItems数组,以便能够将数组绑定到tableView的项目:
searchRes.map{query -> MKLocalSearch in
let request = MKLocalSearchRequest()
request.naturalLanguageQuery = query
request.region = self.mapView.region
return MKLocalSearch(request: request)
}.flatMapLatest{search -> Observable<[MKMapItem]> in
search.start(completionHandler:{(response, error) in
let items: Variable<[MKMapItem]> = Variable([])
if let resp = response {
//need to return the result form this
// i.e. items.value = response.mapItems
}
//can not return from here since the request is async
}
}.bindTo //continue to bind to tableview
如何使用RXSwift完成,我找不到任何相关的例子
答案 0 :(得分:5)
您必须使用ansync请求创建一个Observable。您可以定义以下方法来执行此操作:
_
然后你可以使用func mapItems(for searchRequest: MKLocalSearch) -> Observable<[MKMapItem]> {
return Observable.create { observer in
searchRequest.start(completionHandler: { (response, error) in
if let error = error {
observer.onError(error)
} else {
let items = response?.mapItems ?? []
observer.onNext(items)
observer.onCompleted()
}
})
return Disposables.create {
searchRequest.cancel()
}
}
}
方法:
flatMapLatest