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iOS

Posted by Scott Lind
Scott Lind
2,524 Points

Error when running simple weather app from Pasan

Hello,

I get an error when running my 'Simple Weather App' - the iOS course with Pasan.

Xcode gives me a green breakpoint and I can just continue with the execution just fine, but when I load onto my iPhone, it's just stuck.

My code (I've marked the line of code where it gives me the error): 

import Foundation
import UIKit

struct Current {

**    var currentTime: String? **
    var temperature: Int
    var humidity: Double
    var precipProbability: Double
    var summary: String
    var icon: UIImage?

    init(weatherDictionary: NSDictionary) {
        let currentWeather = weatherDictionary["currently"] as NSDictionary


        temperature = currentWeather["temperature"] as Int
        humidity = currentWeather["humidity"] as Double
        precipProbability = currentWeather["precipProbability"] as Double
        summary = currentWeather["summary"] as String

        let currentTimeInValue = currentWeather["time"] as Int
        currentTime = dateStringFromUnixTime(currentTimeInValue)

        let iconString = currentWeather["icon"] as String
        icon = weatherIconFromString(iconString)

    }

    func dateStringFromUnixTime(UnixTime: Int) -> String {
        let timeInSeconds = NSTimeInterval(UnixTime)
        let weatherDate = NSDate(timeIntervalSince1970: timeInSeconds)

        let dateFormatter = NSDateFormatter()
        dateFormatter.timeStyle = .ShortStyle

        return dateFormatter.stringFromDate(weatherDate)
    }

    func weatherIconFromString(stringIcon: String) -> UIImage {
        var imageName: String

    switch stringIcon {
        case "clear-day":
            imageName = "clear-day"
        case "clear-night":
            imageName = "clear-night"
        case "rain":
            imageName = "rain"
        case "snow":
            imageName = "snow"
        case "sleet":
            imageName = "sleet"
        case "wind":
            imageName = "wind"
        case "fog":
            imageName = "fog"
        case "cloudy":
            imageName = "cloudy"
        case "partly-cloudy-day":
            imageName = "partly-cloudy"
        case "partly-cloudy-night":
            imageName = "cloudy-night"
        default:
            imageName = "default"
        }

        var iconImage = UIImage(named: imageName)
        return iconImage

    }




}

If anyone has experienced the same; please let me know! Any help is much appreciated, thanks!

  • Scott

2 Answers

Vittorio Somaschini
Vittorio Somaschini
33,371 Points
Vittorio Somaschini
Vittorio Somaschini
33,371 Points

Hello Scott.

What error does it return? I think this is not going to be easy to find as it is 3 swift files and a storyboard.

Can you disclose what error it returns? The line you have marked is surely ok like this but this does not means much. Was it the first time you ran your app on the device?

Jorge A. Espinoza
Jorge A. Espinoza
5,675 Points
Jorge A. Espinoza
Jorge A. Espinoza
5,675 Points

I've same problem. This is my error "Value of optional type '' 'UIImage' not unwrapped: did you mean to use '!' or '?' ? "

I try this

func weatherIconFromString(stringIcon: String) -> UIImage {
    var imageName: String

    switch stringIcon {
    case "clear-day":
        imageName = "Sun-thin"
    case "clear-night":
        imageName = "Moon-thin"
    case "rain":
        imageName = "Rain-thin"
    case "snow":
        imageName = "Snow-thin"
    case "sleet":
        imageName = "Hail-thin"
    case "wind":
        imageName = "windy-thin"
    case "fog":
        imageName = "Haze-thin"
    case "cloudy":
        imageName = "cloudy"
    case "partly-cloudy-day":
        imageName = "PartlySunny-thin"
    case "partly-cloudy-night":
        imageName = "PartlyMoon-thin"
    default:
        imageName = "AppIcon"
    }

    var iconName = UIImage(named: imageName)

    return iconName! 
}

But the app is crash when try to load the icon

fatal error: unexpectedly found nil while unwrapping an Optional value