Ios 当使用google directions Api并请求json中的数据时，获取零数据

我对使用swift进行编程和ios开发还不熟悉。我试图在两个位置之间绘制路线，但遇到了此问题

func getDirections(origin: String!, destination: String!, waypoints: Array<String>!, travelMode: AnyObject!, completionHandler: ((status: String, success: Bool) -> Void)) {
    if let originLocation = origin {
        if let destinationLocation = destination {
            var directionsURLString = baseURLDirections + "origin=" + originLocation + "&destination=" + destinationLocation

            directionsURLString = directionsURLString.stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding)!

            let directionsURL = NSURL(string: directionsURLString)

            dispatch_async(dispatch_get_main_queue(), { () -> Void in
                let directionsData = NSData(contentsOfURL: directionsURL!)

                println(directionsData)

                var error: NSError?
                let dictionary: Dictionary<NSObject, AnyObject> = NSJSONSerialization.JSONObjectWithData(directionsData!, options: NSJSONReadingOptions.MutableContainers, error: &error) as! Dictionary<NSObject, AnyObject>

---

您没有在请求URL中包含

API键

您可以使用

NSURLSession

执行方向API请求。从API响应返回数据时，可以使用

NSJSONSerialization.JSONObjectWithData（）

解析JSON日期

 func directionAPITest() {

        let directionURL = "https://maps.googleapis.com/maps/api/directions/json?origin=Toronto&destination=Montreal&key=YOUR_API_KEY"
        let request = NSURLRequest(URL: NSURL(string:directionURL)!)
        let session = NSURLSession.sharedSession()
        session.dataTaskWithRequest(request,
            completionHandler: {(data: NSData!, response: NSURLResponse!, error: NSError!) in

                if error == nil {
                    let object = NSJSONSerialization.JSONObjectWithData(data, options: nil, error: nil) as! NSDictionary
                    println(object)

                    let routes = object["routes"] as! [NSDictionary]
                    for route in routes {
                        println(route["summary"])
                    }
                    dispatch_async(dispatch_get_main_queue()) {
                      //update your UI here 
                    }
                }
                else {
                    println("Direction API error")
                }

        }).resume()
    }

---

如果您需要自定义

mapView

或

UITableView

，可以在

dispatch\u async（dispatch\u get\u main\u queue（）中执行此操作

关闭。

您没有在请求的

URL

中包含

服务器密钥

而不是API密钥…创建一个服务器密钥并等待大约10分钟激活。

您在API请求URL中使用的

源

和

目的地

是什么？'origin'和'destination'是正在ViewController中输入地址。为此，我们在向变量发送nil数据的UItextFields中发现了错误

 func directionAPITest() {

        let directionURL = "https://maps.googleapis.com/maps/api/directions/json?origin=Toronto&destination=Montreal&key=YOUR_API_KEY"
        let request = NSURLRequest(URL: NSURL(string:directionURL)!)
        let session = NSURLSession.sharedSession()
        session.dataTaskWithRequest(request,
            completionHandler: {(data: NSData!, response: NSURLResponse!, error: NSError!) in

                if error == nil {
                    let object = NSJSONSerialization.JSONObjectWithData(data, options: nil, error: nil) as! NSDictionary
                    println(object)

                    let routes = object["routes"] as! [NSDictionary]
                    for route in routes {
                        println(route["summary"])
                    }
                    dispatch_async(dispatch_get_main_queue()) {
                      //update your UI here 
                    }
                }
                else {
                    println("Direction API error")
                }

        }).resume()
    }