UIActivityIndicatorView not showing before the URLSession.shared.dataTask - swift

Question

My UIActivityIndicatorView is not showing when I call it before the API request, and will show after the request has been done,
This is my function that run inside the TouchUpInside of my button
func onLogin () {
let activityIndicator: UIActivityIndicatorView = UIActivityIndicatorView()
activityIndicator.center = view.center
activityIndicator.hidesWhenStopped = true
activityIndicator.style = UIActivityIndicatorView.Style.gray
view.addSubview(activityIndicator)
activityIndicator.startAnimating()
do {
let data = try self.getData()
let loginData = try JSONDecoder().decode(LoginResponse.self, from: data!)
print(loginData)
} catch {
let alert = UIAlertController(title: "Login failed", message: nil, preferredStyle: .alert)
alert.addAction(UIAlertAction(title: "OK", style: .default))
present(alert, animated: true, completion: nil)
}
}
and my request code was
static func getData() throws -> Data? {
let urlData = URL(string: "www.example.com")
var request : URLRequest = URLRequest(url: urlData!)
request.httpMethod = "POST"
request.httpBody = self.getBodyString.data(using: .utf8)
var data: Data?
var response: URLResponse?
var error: Error?
let semaphore = DispatchSemaphore(value: 0)
URLSession.shared.dataTask(with: request) { d,r,e in
data = d
response = r
error = e
semaphore.signal()
}.resume()
_ = semaphore.wait(timeout: .distantFuture)
if error != nil {
throw error!
}
return data
}
when I remove the do catch with getData() in my onLogin() function the UIActivityIndicatorView was working good.
The response of my API call was request timeout, but I want to see the indicator loading the request.

Answer 1

Try to bring activity indictor to front of UIview and Use it in DispatchQueue.main.async