Swift in Xcode 6: How to use geocoding properly with Google Maps? - xcode

Question

I'm new to swift. I am trying to create a call to Google's API to convert any inputted addresses to a long, lat location on google maps, using their sdk.
I thought it'd be easier to start by following a tutorial http://www.appcoda.com/google-maps-api-tutorial/, then dissecting it. But I cannot seem to get it this particular line working. It will come out with a "error-exc-bad-instruction-code-exc-i386-invop-subcode-0x0" on the dicitonary line. I read other sample work on reverse geocoding that are to date, and they look very similar, but none are working. What am I doing wrong?
let dictionary: Dictionary<NSObject, AnyObject> =
NSJSONSerialization.JSONObjectWithData(geocodingResultsData!, options:
NSJSONReadingOptions.MutableContainers, error: &error) as!
Dictionary<NSObject, AnyObject>
Full function below:
func geocodeAddress(address: String!, withCompletionHandler completionHandler: ((status: String, success: Bool) -> Void)) {
if let lookupAddress = address {
var geocodeURLString = baseURLGeocode + "address=" + lookupAddress
geocodeURLString = geocodeURLString.stringByAddingPercentEscapesUsingEncoding(NSUTF8StringEncoding)!
let geocodeURL = NSURL(string: geocodeURLString)
dispatch_async(dispatch_get_main_queue(), { () -> Void in
let geocodingResultsData = NSData(contentsOfURL: geocodeURL!)
var error: NSError?
let dictionary: Dictionary<NSObject, AnyObject> = NSJSONSerialization.JSONObjectWithData(geocodingResultsData!, options: NSJSONReadingOptions.MutableContainers, error: &error) as! Dictionary<NSObject, AnyObject>
// let dictionary: Dictionary = NSJSONSerialization.JSONObjectWithData(geocodingResultsData!, options: NSJSONReadingOptions.MutableContainers, error: &error) as! Dictionary
if (error != nil) {
println(error)
completionHandler(status: "", success: false)
}
else {
// Get the response status.
let status = dictionary["status"] as! String
if status == "OK" {
let allResults = dictionary["results"] as! Array<Dictionary<NSObject, AnyObject>>
self.lookupAddressResults = allResults[0]
// Keep the most important values.
self.fetchedFormattedAddress = self.lookupAddressResults["formatted_address"] as! String
let geometry = self.lookupAddressResults["geometry"] as! Dictionary<NSObject, AnyObject>
self.fetchedAddressLongitude = ((geometry["location"] as! Dictionary<NSObject, AnyObject>)["lng"] as! NSNumber).doubleValue
self.fetchedAddressLatitude = ((geometry["location"] as! Dictionary<NSObject, AnyObject>)["lat"] as! NSNumber).doubleValue
completionHandler(status: status, success: true)
}
else {
completionHandler(status: status, success: false)
}
}
})
}
else {
completionHandler(status: "No valid address.", success: false)
}
}

Answer 1

For Swift 2, this can be used:
First, declare your variable as an empty dictionary outside of the do-catch block and do the assignment in the block, like below
do {
dictionary = try NSJSONSerialization.JSONObjectWithData(geocodingResultsData!, options: NSJSONReadingOptions.MutableContainers) as! Dictionary<NSObject, AnyObject>
} catch {
//something
}