I'm building an iOS app in Swift 3 that's supposed to communicate with a JSON Rest Api that I'm also building myself. The app will get all sorts of content from the Api, but for now all I need it to do is check the availability of the Api through a handshake function.
let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
if error != nil {
print(error)
} else {
if let urlContent = data {
do {
let jsonResult = try JSONSerialization.jsonObject(with: urlContent, options: JSONSerialization.ReadingOptions.mutableContainers) as! NSDictionary
if jsonResult["response"] as! String == "Welcome, come in!" {
print("************ RESPONSE IS: ************")
print(jsonResult)
return
} else {
return
}
} catch {
print("************ JSON SERIALIZATION ERROR ************")
}
}
}
}
task.resume()
This is the dataTask I've set up and it runs just fine (When I print the jsonResult, I get the "Welcome!" message as expected. The problem is that I want my handshake function to return true or false (So that I can give an alert if the case is false.) When I try to set up a return true or false within the if-statement, I get the error: Unexpected non-void return value in void function.
My question is: How do I return the data out of the dataTask so that I can perform checks with it within my handshake function? I'm very new to Swift so all help is appreciated :)
Below is the entire class:
import Foundation
class RestApiManager: NSObject {
var apiAvailability:Bool?
func handshake() -> Bool {
let url = URL(string: "https://api.restaurapp.nl/handshake.php")!
let task = URLSession.shared.dataTask(with: url) { (data, response, error) in
if error != nil {
print(error)
} else {
if let urlContent = data {
do {
let jsonResult = try JSONSerialization.jsonObject(with: urlContent, options: JSONSerialization.ReadingOptions.mutableContainers) as! NSDictionary
if jsonResult["response"] as! String == "Welcome, come in!" {
print("************ RESPONSE IS: ************")
print(jsonResult)
return true
} else {
return false
}
} catch {
print("************ JSON SERIALIZATION ERROR ************")
}
}
}
}
task.resume()
}
}
