当我运行应用程序时，Xcode 告诉我 解包 Optional 值时意外发现 nil 在 url 但 url 不是 nil，有人可以帮忙吗？
这是代码
import Foundation
protocol WeatherUndergroundServiceByGeographicalDelegate{
func setWeatherByGeographical(weather:WeatherUnderground)
}
class WeatherUndergoundServiceByGeographical{
var delegate:WeatherUndergroundServiceByGeographicalDelegate?
func getWeatherFromWeatherUnderground(latitude:Double, longitude:Double){
let path = "http://api.wunderground.com/api/48675fd2f5485cff/conditions/geolookup/q/\(latitude,longitude).json"
let url = NSURL(string: path)
//session
let session = NSURLSession.sharedSession()
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~Error is at here~~~~~~~~~~~~~~~~~~~~~~~~~
let task = session.dataTaskWithURL(url!) { (data:NSData?, response:NSURLResponse?, error:NSError?) -> Void in
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
let json = JSON(data: data!)
//parsing json weather condition from weather api. using swiftyJson
let name = json["current_observation"]["display_location"]["city"].string
let temp = json["current_observation"]["temp_c"].double
let windsp = json["current_observation"]["wind_mph"].double
//prasing the weather data
let weather = WeatherUnderground(cityName: name!, temperature: temp!, windSpeed: windsp!)
if self.delegate != nil{
dispatch_async(dispatch_get_main_queue(), { () -> Void in
self.delegate?.setWeatherByGeographical(weather)
})
}
}
task.resume()
}
}
最佳答案
你的路径字符串中可能有错误，试试这个:
let path = "http://api.wunderground.com/api/48675fd2f5485cff/conditions/geolookup/q/\(latitude),\(longitude).json"
原因是您在字符串中插入元组值 \(latitude,longitude)，这会增加额外的空间并使 url 字符串无效，因为空间不是百分比转义。
相反，您必须在每个值之间插入一个逗号:\(latitude),\(longitude)
关于ios - 运行应用程序时 Swift NSURL nil，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36059342/