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iOS

Posted by Casey Ward
Casey Ward
3,092 Points

Errors with the custom Struct "Current" in the Building Simple Weather App lesson

Hi there, I believe I'm using the exact syntax as Pasan writes within the "Current.swift" file during his lesson on Building a Simple Weather App but I'm receiving two different errors that I'm unsure how to correct. Thanks in advance for any assistance.

Here are the two errors:

1: '()' is not convertible to 'UIImage'

2: Cannot convert the expression's type 'UIImage?' to type '()'

Error #1 occurs on the line of code that reads:

icon = weatherIconFromString(iconString)

And error #2 occurs on the last line of code in the file that reads:

return iconImage

And here's the complete syntax I'm using within this Current.swift file.

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


        //currentTime = currentWeather["time"] as Int

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


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

        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) {
        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

    }

1 Answer

Stone Preston
Stone Preston
42,016 Points

you need to add a return type of UIImage by placing -> UIImage at the end of the function header

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

    }
Casey Ward
Casey Ward
3,092 Points

Thank you. That worked!