Can't display JSON results on in a HOME.VC text label - ios

Question

I am trying to display a Json result (temperature and Humidity) on my view controller (respectively temperatureDisp and humidityDisp), but it does not seem to work.
class HomeVC: UIViewController {
#IBOutlet var usernameLabel: UILabel!
#IBOutlet var temperatureDisp: UILabel!
#IBOutlet var humidityDisp: UILabel!
#IBAction func logoutTapped(sender: AnyObject) {
let appDomain = NSBundle.mainBundle().bundleIdentifier
NSUserDefaults.standardUserDefaults().removePersistentDomainForName(appDomain!)
self.performSegueWithIdentifier("goto_login", sender: self)
}
override func viewDidAppear(animated: Bool) {
let prefs:NSUserDefaults = NSUserDefaults.standardUserDefaults()
let isLoggedIn:Int = prefs.integerForKey("ISLOGGEDIN") as Int
if (isLoggedIn != 1) {
self.performSegueWithIdentifier("goto_login", sender: self)
} else {
self.usernameLabel.text = prefs.valueForKey("USERNAME") as! NSString as String
}
}
override func viewDidLoad() {
super.viewDidLoad()
var url2 : String = "http://admin:xxxxxxx#xxxxxx/xxxxx.fr/metrics2.php"
var request2 : NSMutableURLRequest = NSMutableURLRequest()
request2.URL = NSURL(string: url2)
request2.HTTPMethod = "GET"
NSURLConnection.sendAsynchronousRequest(request2, queue: NSOperationQueue(), completionHandler: {(response: NSURLResponse!,data: NSData!,error: NSError!) -> Void in
var error: AutoreleasingUnsafeMutablePointer<NSError?> = nil
let jsonResult : NSArray! = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: error) as! NSArray
if (jsonResult != nil) {
println(jsonResult)
} else {
println("There is a problem")
}
var temperature = jsonResult[0].valueForKey("temperature") as! String
var humidity = jsonResult[0].valueForKey("humidite") as! String
println(temperature)
println(humidity)
self.humidityDisp.text = temperature
})
}
}}
That is how the variable jsonResult looks :
(
{
Id = 117;
date = "2015-04-06";
humidite = "45.3";
login = raspberrypi;
luminosite = "\U00e9teinte";
temperature = "18.4";
time = "16:25:21";
}
)

Answer 1

I'm not sure what you mean by "it does not seem to work", but from your code I can assume at least that you are not getting the values you expect from your JSON result, but more likely your app is crashing like crazy. If you want to write applications in Swift you absolutely must understand optionals and learn how to properly work with them. Read The Swift Programming Language—and thoroughly. As your code is now, by force unwrapping using as! and using implicitly unwrapped types (those followed by !) you are ignoring the entire concept of optionals and opening yourself up to crashes.
So, assuming that there is no network or parsing errors, and assuming that the JSON string you're parsing has an array as its root object, the following should work. I've taken the liberty of typing and unwrapping your variables appropriately, as well as cleaning up some of the cruft.
class HomeVC: UIViewController {
#IBOutlet var usernameLabel: UILabel!
#IBOutlet var temperatureDisp: UILabel!
#IBOutlet var humidityDisp: UILabel!
#IBAction func logoutTapped(sender: AnyObject) {
if let appDomain = NSBundle.mainBundle().bundleIdentifier {
NSUserDefaults.standardUserDefaults().removePersistentDomainForName(appDomain)
}
self.performSegueWithIdentifier("goto_login", sender: self)
}
override func viewDidAppear(animated: Bool) {
let prefs = NSUserDefaults.standardUserDefaults()
let isLoggedIn = prefs.boolForKey("ISLOGGEDIN")
if isLoggedIn {
self.performSegueWithIdentifier("goto_login", sender: self)
} else {
if let username = prefs.stringForKey("USERNAME") {
self.usernameLabel.text = username
}
}
}
override func viewDidLoad() {
super.viewDidLoad()
var url2 = "http://admin:xxxxxxx#xxxxxx/xxxxx.fr/metrics2.php"
var request2 = NSMutableURLRequest()
request2.URL = NSURL(string: url2)
request2.HTTPMethod = "GET"
NSURLConnection.sendAsynchronousRequest(request2, queue: NSOperationQueue()) { (response: NSURLResponse!,data: NSData!,error: NSError!) in
var parseError:NSError?
if let data = data, let jsonResults = NSJSONSerialization.JSONObjectWithData(data, options: NSJSONReadingOptions.MutableContainers, error: &parseError) as? NSArray {
println( jsonResults )
if let result = jsonResults.firstObject as? [String : AnyObject] {
if let humidity = result["humidite"] as? String {
self.humidityDisp.text = humidity
}
if let temperature = result["temperature"] as? String {
self.temperatureDisp.text = temperature
}
}
} else {
println("There is a problem: \(parseError)" )
}
}
}
}