Swift

Question

以下应用应获取用户的当前位置，然后使用 OpenWeatherMap 显示该位置的名称和温度。

import UIKit
import CoreLocation

class ViewController: UIViewController, CLLocationManagerDelegate {

    @IBOutlet weak var location: UILabel!
    @IBOutlet weak var temperature: UILabel!

    var locationManager: CLLocationManager = CLLocationManager()
    var startLocation: CLLocation!

    func extractData(weatherData: NSData) {
        let json = try? NSJSONSerialization.JSONObjectWithData(weatherData, options: []) as! NSDictionary

        if json != nil {
            if let name = json!["name"] as? String {
                location.text = name
            }

            if let main = json!["main"] as? NSDictionary {
                if let temp = main["temp"] as? Double {
                    temperature.text = String(format: "%.0f", temp)
                }
            }
        }
    }

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

        let lat = latestLocation.coordinate.latitude
        let lon = latestLocation.coordinate.longitude

        // Put together a URL With lat and lon
        let path = "http://api.openweathermap.org/data/2.5/weather?lat=\(lat)&lon=\(lon)&appid=2854c5771899ff92cd962dd7ad58e7b0"
        print(path)            

        let url = NSURL(string: path)

        let task = NSURLSession.sharedSession().dataTaskWithURL(url!) { (data, response, error) in
            dispatch_async(dispatch_get_main_queue(), {
                self.extractData(data!)
            })
        }

        task.resume()
    }

    func locationManager(manager: CLLocationManager,
        didFailWithError error: NSError) {

    }

    override func viewDidLoad() {
        super.viewDidLoad()

        locationManager.desiredAccuracy = kCLLocationAccuracyBest
        locationManager.delegate = self
        locationManager.requestWhenInUseAuthorization()
        locationManager.startUpdatingLocation()
        startLocation = nil
    }
}

我一直在学习如何按照本教程从 OpenWeatherMap 获取数据： https://www.youtube.com/watch?v=r-LZs0De7_U

应用崩溃时间：

self.extractData(data!)

由于数据等于 nil，这不应该发生，因为当我将打印的路径复制并粘贴到我的网络浏览器中时，数据就在那里。我确定我已经正确地按照教程进行操作，那么问题是什么以及如何解决它？

Answer 1

问题出在运输安全上——这给我们很多人带来了问题。这是解释如何解决它的 SO 答案之一

如果您在 plist 中进行设置 - 在 .plist 文件中的 NSAppTransportSecurity 字典下将 NSAllowsArbitraryLoads 键设置为 YES - 然后就可以了。

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