URLQuery item 没有抓取位置坐标

Question

我想知道我的问题是什么原因造成的。我正在使用核心位置来获取我的坐标位置，我在网络方法中将其用作 URLQueryItem，以便从 API 获得响应。但是控制台输出显示纬度查询和经度查询都等于 0，而我有我的纬度和经度值。我在 viewdidload 中使用网络方法。

感谢所有回复和解释。

  var queryLattitudeItem : Double = 0
  var queryLongitudeItem : Double = 0

func network () {

        let configuration = URLSessionConfiguration.default
        configuration.waitsForConnectivity = true
        let session = URLSession(configuration: configuration)
        guard let urls = URL(string:"https://api.yelp.com/v3/businesses/search") else { return }
        var urlcomponent = URLComponents(string: "\(urls)")
        let queryLat = URLQueryItem(name:"latitude" , value: "\(queryLattitudeItem)")
        let queryLong = URLQueryItem(name: "longitude", value: "\(queryLongitudeItem)")
        let queryItemterm = URLQueryItem(name: "term", value: "restaurant")
        let queryLimit = URLQueryItem(name: "limit", value: "10")
        urlcomponent?.queryItems = [queryItemterm,queryLat,queryLong,queryLimit]
        print(urlcomponent!)
        print(queryLat)
        print(queryLong)
        var request = URLRequest(url: urlcomponent!.url!)
        request.httpMethod = "GET"
        request.addValue("Bearer \(apiKey)", forHTTPHeaderField: "Authorization")
        request.addValue("application/json", forHTTPHeaderField: "Content-Type")

        let task = session.dataTask(with: request) { (data, response, error) in

            if let response = response as? HTTPURLResponse {
                print(response)

            } else{
                print("error")
            }

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
        let location = locations[locations.count - 1]

        if location.horizontalAccuracy > 0 {
            locationManager.stopUpdatingLocation()
          print("\(location.coordinate.longitude), \(location.coordinate.latitude)")

        }
        let latitude : Double = (location.coordinate.latitude)
        let longitude : Double = location.coordinate.longitude
        print("This is lat: \(latitude), et long\(longitude)")
        queryLattitudeItem = latitude
        queryLongitudeItem = longitude


    }

控制台输出

https://api.yelp.com/v3/businesses/search?term=restaurant&latitude=0.0&longitude=0.0&limit=10
latitude=0.0
longitude=0.0
-73.984638, 40.759211
This is lat: 40.759211, et long-73.984638
<NSHTTPURLResponse: 0x600003a91ec0> { URL: https://api.yelp.com/v3/businesses/search?term=restaurant&latitude=0.0&longitude=0.0&limit=10 } { Status Code: 200, Headers {
    "Accept-Ranges" =     (

Answer 1

我会对您的代码做的一种风格化的事情是利用某种结构来存储字符串，这样它们就不会散落在您的代码中。当出现问题时，您可以到一个地方调试它，而不是翻阅一堆代码。在这里，我将字符串作为静态 let 存储在枚举中（b/c 我讨厌 rawValues）：

enum Endpoint {
    static let yelp = "https://api.yelp.com/v3/businesses/search"
}

接下来，我将放弃纬度和经度的 var 声明：

var queryLattitudeItem : Double = 0 //  nuke
var queryLongitudeItem : Double = 0 //  nuke

相反，我会更新您的网络请求方法以直接从委托方法中接受 CLLocationCoordinate2D，如下所示：

func getYelpInfo(for coordinate: CLLocationCoordinate2D) {

    // omitted your networking code...this is just the URL creation code

    var components = URLComponents(string: Endpoint.yelp)
    let queryLat = URLQueryItem(name: "latitude", value: String(coordinate.latitude))
    let queryLong = URLQueryItem(name: "longitude", value: String(coordinate.latitude))
    let queryLimit = URLQueryItem(name: "limit", value: "10")
    components?.queryItems = [queryLat, queryLong, queryLimit]

    // You could use a guard statement here if you want to exit out, too
    if let url = components?.url {
        var request = URLRequest(url: url)
        // do your networking request
    }


    print(components!.url!.absoluteString)
}

接下来，在您的 didUpdateLocations 中，我将调用更新后的方法，如下所示：

getYelpInfo(for: location.coordinate)

您更新后的方法如下所示：

func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
    let location = locations[locations.count - 1]

    if location.horizontalAccuracy > 0 {
        locationManager.stopUpdatingLocation()
        getYelpInfo(for: location.coordinate)
        print("\(location.coordinate.longitude), \(location.coordinate.latitude)")

    }
}

URLQuery item 没有抓取位置坐标

URLQuery item does not grab the location coordinate

core-location

ios

swift

nsurlcomponents