How do you pass a value to an API in Swift? - ios

Question

I am pretty much a beginner in Swift and I am trying to pass a value to make a call to an API with the value being from an input field.
The API is given below. How do I write code to pass value for ZIP_CODE from a text field?
https://iaspub.epa.gov/enviro/efservice/getEnvirofactsUVDAILY/ZIP/ZIP_CODE/JSON
#IBOutlet var zipLabel: UILabel!
#IBOutlet var zipInput: UITextField!
#IBOutlet var jsondataLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
getJSON()
}
#IBAction func btnAction() {
zipLabel.text = zipInput.text
}
func getJSON(){
let url = NSURL(string :"https://iaspub.epa.gov/enviro/efservice/getEnvirofactsUVDAILY/ZIP/10001/JSON")
let request = URLRequest(url: url as! URL )
let config = URLSessionConfiguration.default
let session = URLSession(configuration: config)
let task = session.dataTask(with: request){(data, response, error ) -> Void in
if error == nil{
DispatchQueue.main.async(execute: {
let jsondata = JSON(data : data!)
print(jsondata)
print("-----")
print(jsondata[0]["UV_INDEX"])
let result = jsondata[0]["UV_INDEX"].stringValue
self.jsondataLabel.text = result
})
}else{
print("There was an error")
}
}
task.resume()
}

Answer 1

func getJSON(_ zipcode : Int){
let url = NSURL(string :"https://iaspub.epa.gov/enviro/efservice/getEnvirofactsUVDAILY/ZIP/\(zipcode)/JSON")
let request = URLRequest(url: url as! URL )
let config = URLSessionConfiguration.default
let session = URLSession(configuration: config)
let task = session.dataTask(with: request){(data, response, error ) -> Void in
if error == nil{
DispatchQueue.main.async(execute: {
let jsondata = JSON(data : data!)
print(jsondata)
print("-----")
print(jsondata[0]["UV_INDEX"])
let result = jsondata[0]["UV_INDEX"].stringValue
self.jsondataLabel.text = result
})
}else{
print("There was an error")
}
}
task.resume()
}

Answer 2

If your API gives you the response on GET Request you can use the following code -
#IBOutlet var zipLabel: UILabel!
#IBOutlet var zipInput: UITextField!
#IBOutlet var jsondataLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
}
#IBAction func btnAction() {
zipLabel.text = zipInput.text
getJSON(zipcode: zipInput.text)
}
func getJSON(zipcode: String){
let url = NSURL(string :"https://iaspub.epa.gov/enviro/efservice/getEnvirofactsUVDAILY/ZIP/10001/JSON&zipcode="+zipcode)
let request = URLRequest(url: url as! URL )
let config = URLSessionConfiguration.default
let session = URLSession(configuration: config)
let task = session.dataTask(with: request){(data, response, error ) -> Void in
if error == nil{
DispatchQueue.main.async(execute: {
let jsondata = JSON(data : data!)
print(jsondata)
print("-----")
print(jsondata[0]["UV_INDEX"])
let result = jsondata[0]["UV_INDEX"].stringValue
self.jsondataLabel.text = result
})
}else{
print("There was an error")
}
}
task.resume()
}
But Please note that this code won't work if your API gives you the response on POST request.