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我正在尝试实现一个搜索栏,用户可以在其中输入字符串并搜索地址或企业。

为了寻找企业,我使用 Yelp API 来外包我需要的信息。

为了查找地址,我使用 Apple 的MKLocalSearchAPI 来获取我需要的信息。

不过,我确实有问题。当我按住退格按钮从搜索栏中清除文本或在搜索栏中输入太快时,我收到MKErrorDomain错误消息:

The operation couldn’t be completed. (MKErrorDomain error 3.)

当我收到此错误时,我将不得不等待片刻,以便代码再次运行并从 API 中检索信息。

以下代码是我必须实现我正在寻找的内容:

这是搜索栏委托方法:

func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {

    if searchBar.text == "" {
        addServiceCellToTableView()
        loadSearchHistory()
        return
    } else if searchBar.text != "" {
        removeServiceCellFromTableView()
    }


    if searchCompleter.isSearching{
        searchCompleter.cancel()
        searchCompleter.region = (delegate?.businessSearchResultTableViewControllerNeedsUpdatedMapRegion(self))!
        searchCompleter.queryFragment = searchText
    } else {
        searchCompleter.region = (delegate?.businessSearchResultTableViewControllerNeedsUpdatedMapRegion(self))!
        searchCompleter.queryFragment = searchText
    }

}

我用来MKLocalSearchCompleter根据用户在搜索栏中输入的内容获取建议:

func completerDidUpdateResults(_ completer: MKLocalSearchCompleter){

    guard completer.results.count != 0 else {return}

    var searchTerm: String = completer.results.first!.title
    if completer.results.first!.subtitle != "" {
        searchTerm = searchTerm + ", " + completer.results.first!.subtitle
    }


    if let _ = addressDetector.firstMatch(in: searchTerm, options: [], range: NSMakeRange(0, searchTerm.utf8.count)){
        searchAddress(for: searchTerm)
    } else {
        getBusinesses(withSearchTerm: searchTerm, userCoordinates: currentUserLocation.coordinate)
    }


}

在上面的代码中,我NSDataDetector用来查看建议的文本是否是地址...如果是,我将其输入MKLocalSearch...

最后,为了搜索地址,我定义了一个名为searchAddress(for:)

func searchAddress(for string: String){

        let localSearchRequest = MKLocalSearchRequest()
        localSearchRequest.naturalLanguageQuery = string
        localSearchRequest.region = (delegate?.businessSearchResultTableViewControllerNeedsUpdatedMapRegion(self))!

        let localSearch = MKLocalSearch(request: localSearchRequest)
        localSearch.start(completionHandler: {searchResponse, error in
            guard error == nil else {
                print(error.debugDescription)
                return
            }

            guard let mapItems = searchResponse?.mapItems else {return}

            self.tableViewDataSourceList = mapItems
            self.tableView.reloadData()
            self.delegate?.businessSearchResultTableViewStopedGettingBusiness(self, with: self.tableViewDataSourceList, at: CLLocationCoordinate2D(latitude: self.currentUserLocation.coordinate.latitude, longitude: self.currentUserLocation.coordinate.longitude))
        })
    }

当我键入太快或按住退格键时,我在控制台中收到以下错误:

The operation couldn’t be completed. (MKErrorDomain error 3.)
The operation couldn’t be completed. (MKErrorDomain error 3.)
The operation couldn’t be completed. (MKErrorDomain error 3.)
The operation couldn’t be completed. (MKErrorDomain error 3.)
The operation couldn’t be completed. (MKErrorDomain error 3.)
The operation couldn’t be completed. (MKErrorDomain error 3.)
The operation couldn’t be completed. (MKErrorDomain error 3.)
The operation couldn’t be completed. (MKErrorDomain error 3.)

任何帮助都感激不尽 :-)

4

1 回答 1

4

您在这里看到的是MKError.loadingThrottled错误。您将不得不延迟发送给 Apple 的请求。

您可以通过在每次用户更新搜索查询时重新启动计时器来做到这一点。您可以通过延长计时器的长度来调整 ping API 的频率。通过在每次更新查询时重置计时器,您可以避免在字符快速更改时发送多个请求。

// declare and store Timer somewhere

func searchAddress(with query: String) {

}

func timerDidFire(_ sender: Any) {
    let query = textField.text
    searchAddress(with: query)
}

Timer.scheduledTimerWithTimeInterval(0.5, target: self, selector: #selector(timerDidFire), userInfo: nil, repeats: false)
于 2017-12-07T07:06:30.037 回答