How can I make these two functions work well together? - ios

Question

I want to randomize the image background of weather depending on the weather information. I want to make them work one after the other;
the first function will make a string and the second function use the string produced by the first one.
import UIKit
class ViewController: UIViewController, UITextFieldDelegate {
#IBOutlet weak var cityNameTextField: UITextField!
#IBOutlet weak var weatherFact: UILabel!
#IBOutlet weak var weatherImage: UIImageView!
var weather = ""
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.cityNameTextField.delegate = self
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
#IBAction func weatherButton(sender: UIButton) {
weatherInformation()
randomWeatherImage()
}
func showError() {
self.weatherFact.text = "we can't load the weather of \(cityNameTextField.text). please try again"
}
override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
self.view.endEditing(true)
}
func textFieldShouldReturn(textField: UITextField) -> Bool {
self.view.endEditing(true)
return true
}
func randomWeatherImage() {
if weatherFact.text != nil {
let string = weather
let regex = NSRegularExpression(pattern: "-?[0-9]{1,3}", options: NSRegularExpressionOptions(), error: nil)
if let matches = regex?.matchesInString(string, options: NSMatchingOptions(), range: NSRange(location: 0, length: count(string))){
let degrees = matches.map { return(string as NSString).substringWithRange($0.range) }
var maxDegree = degrees[0].toInt()
var minDegree = degrees[1].toInt()
var averageWeather:Int = (maxDegree! + minDegree!) / 2
if averageWeather < 0 {
self.weatherImage.image = UIImage(named: "Cold.jpg")
}
else if averageWeather > 20 {
self.weatherImage.image = UIImage(named: "Warm.jpg")
}
else {
self.weatherImage.image = UIImage(named: "Mild.jpg")
}
}
}
}
func weatherInformation() {
let url = NSURL(string: "http://www.weather-forecast.com/locations/" + cityNameTextField.text.stringByReplacingOccurrencesOfString(" ", withString: "-") + "/forecasts/latest")
if url != nil {
let task = NSURLSession.sharedSession().dataTaskWithURL(url!){ (data, response, error) in
var urlError = false
if error == nil {
var urlContent = NSString(data: data, encoding: NSUTF8StringEncoding)
var urlContentArray = urlContent!.componentsSeparatedByString("<span class=\"phrase\">")
if urlContentArray.count > 0 {
var weatherArray = urlContentArray[1].componentsSeparatedByString("</span>")
self.weather = weatherArray[0] as! String
self.weather = self.weather.stringByReplacingOccurrencesOfString("°", withString: "º")
}
else {
urlError = true
}
}
else {
urlError = true
}
dispatch_async(dispatch_get_main_queue()) {
if urlError == true {
self.showError()
}
else {
self.weatherFact.text = self.weather
}
}
}
task.resume()
}
else {
showError()
}
}
}

Answer 1

Just call randomWeatherImage after you set weatherFact.text:
dispatch_async(dispatch_get_main_queue()) {
if urlError == true {
self.showError()
}
else {
self.weatherFact.text = self.weather
self.randomWeatherImage()
}
}