Question

我的视图控制器文件中有一个名为temperature的实例变量，以及一个带有所有cityID的数组

    var temperature:Array<String>?

我有一个获取城市温度的函数：

    func getCityCurrentTemperture(cityID:String){

    let session = URLSession.shared
    let weatherURL = URL(string: "http://api.openweathermap.org/data/2.5/weather?id=\(cityID)&APPID=\(apiId)")!
    let dataTask = session.dataTask(with: weatherURL) {
        (data: Data?, response: URLResponse?, error: Error?) in
        if let error = error {
            let errorCode=(error as NSError).code
            if errorCode == -1009{
                print("no internet")
            }else{
                print("Error:\n\(error)")
            }

        } else {
            if let data = data {
                let dataString = String(data: data, encoding: String.Encoding.utf8)
                //                    print("All the weather data:\n\(dataString!)")
                if let jsonObj = try? JSONSerialization.jsonObject(with: data, options: .allowFragments) as? NSDictionary {

                    if let mainDictionary = jsonObj!.value(forKey: "main") as? NSDictionary {
                        if let temperture = mainDictionary.value(forKey: "temp") {
                            DispatchQueue.main.async {
                                let currTempNumber = (temperture as? Double)! - 273.15
                                //                                    let currTempText = "\(currTempNumber)°C"
                                let currTempText=String(format: "%.02f °C", currTempNumber)
                               self.temperture?.append(currTempText)

                            }

                        }


                    }

                } else {
                    print("Error: unable to convert json data")
                }
            } else {
                print("Error: did not receive data")
            }
        }
    }

    dataTask.resume()
}

然后，在 ViewDidLoad（）中：

 for i in cityID{
        getCityCurrentTemperture(cityID: i)
    }
    print(temperature)

温度始终显示为零。我是Swift的新手，我不知道如何将数据存储回数组。在正确存储城市的温度后，我需要使用温度进行进一步的工作。我怎样才能做到这一点？预先感谢

调用函数后如何将数据保存在数组中？

0 个答案: