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iOS Build a Weather App with Swift Managing Complexity Grand Central Dispatch

Posted by Michael Zaro
Michael Zaro
13,196 Points

I am getting crashes on my code and the code downloaded from the course downloads section. What's up?

In the Grand Central Dispatch section of the Stormy app we run the app. Mine does not display the correct information from the API even though I am getting draws from the darksky API. My available calls number is going down, so I see that I it is at least calling the API.

The crash seems to be coming from the view controller, but I even get crashes from the downloaded code. Any advice. Here is my code, for the sake of comparison.

""" // // ViewController.swift // Stormy // // Created by James Plauche on 9/1/15. // Copyright (c) 2015 Tanner Plauché. All rights reserved. //

import UIKit

class ViewController: UIViewController { @IBOutlet weak var currentTemperatureLabel: UILabel? @IBOutlet weak var currentHumidityLabel: UILabel? @IBOutlet weak var currentpercipitationLabel: UILabel? private let forecastApiKey = "894454c71c0f2bf41eb5f29c71b0b9ab" let coordinate: (lat: Double, long: Double) = (37.8267,-122.423)

override func viewDidLoad() {
   let forecastService = ForecastService(APIKey: forecastApiKey)
    forecastService.getForecast(coordinate.lat, long: coordinate.long) {
        (let currently) in

        if let currentWeather = currently {
            //update UI
            dispatch_async(dispatch_get_main_queue()){
                //execute closure
                if let temperature = currentWeather.temperature {
                    self.currentTemperatureLabel?.text = "\(temperature)º"

                    }
                if let humidity = currentWeather.humidity {
                    self.currentHumidityLabel?.text = "\(humidity)%"
                }
                if let precipitation = currentWeather.precipProbability {
                    self.currentpercipitationLabel?.text = "\(precipitation)%"
                }
            }
        }
    }


} //end of viewDidLoad

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}

}

"""

Antonija Pek
Antonija Pek
5,819 Points

Well I assume you have updated your Xcode (to version 7) as I am so this videos are obsolete, and there aren't new ones. Yet. But I am not paying to wait so I guess many people will pause their subscription until they fix this huge problem.

1 Answer

Stephen Whitfield
Stephen Whitfield
16,771 Points
Stephen Whitfield
Stephen Whitfield
16,771 Points

So what is the debugger telling you? Look in the console when the app crashes and paste it here. Make sure you are connecting the outlets in your .xib/storyboard file correctly. Also, go ahead and throw super.viewDidLoad() in your subclass of UIViewController before writing all of that code.