how to send back asynchronous request to viewDidLoad method - ios

Question

i'm new on programming and of course swift. and i'm wondering how can i send back my request response to my viewDidLoad to to use there.
for requesting, i'm using alamofire and for json , swiftyJSON.
what i'm trying to do is to Get data(JSON) from server which contains titles and image urls. after that i'm trying to Get images from image urls.
in viewDidLad, i call a function which is a Get method.
override func viewDidLoad() {
super.viewDidLoad()
getData()
//use myStruct
in getData() i do this:
func getData()
{
Alamofire.request(.GET,"heregoesurl")
.responseJSON { response in
if let Json = response.result.value {
let json = JSON(Json)
for (_,subJson):(String, JSON) in json {
//get image url
//pass image url to imageGet() method
//add image to an array of myStruct
}
}
}
}
and in imageGet() method:
func getImages(url:String,type:String)
{
Alamofire.request(.GET, url)
.responseImage { response in
if let image = response.result.value {
//add image to myStruct
}
}
}
the problem is because of async nature of request, myStruct isn't ready in viewDidLoad. i used completionHandler for getData() method and it works fine. but still i don't have images and i just have image urls there. i don't know what should i do then.
any help on how to do things like this would be appreciated.

Answer 1

Try this:
public func getImages(url:String,type:String){
Alamofire.request(.GET, url).response { (request, response, data, error) in
//For sure that you will have the main queue and you will see the view
dispatch_sync(dispatch_get_main_queue(), {
self.myImageView.image = UIImage(data: data, scale:1) // or store it to your `myStruct`
})
}
}
call it inside of getData() function

Answer 2

use this:
extension UIImageView {
func downloadImage(from url : String){
let urlRequest = URLRequest(url: URL(string: url)!)
let task = URLSession.shared.dataTask(with: urlRequest){(data,response,error)in
if error != nil {
print(error)
}
DispatchQueue.main.async {
self.image = UIImage(data:data!)
}
}
task.resume()
}
}