How do you create a simple login screen in Xcode? - swift

Question

I am making an app that uses a login screen I made. The input is this Text Field that you type in your username. How do I make it respond to different usernames? For example the username is UK. How do I make it respond to if it is or is not 'UK'? I am a complete beginner to Xcode so could you please walk me through the steps please?
I tried using this if(Username!.text, isEqual: "Hello") that I saw from a video, but an error pops up saying:
'(String?, isEqual: String)' is not convertible to 'Bool'.
I have no idea what it means and how to get around it.
import UIKit
class ViewController: UIViewController {
#IBOutlet var ftest: UILabel!
#IBOutlet var Username: UITextField?
#IBOutlet var Password: UITextField!
#IBAction func SignIn(_ sender: Any) {
if(Username!.text, isEqual: "Hello")
}
//this code above is the code I tried to do based on a video and it did not work.
override func viewDidLoad() {
super.viewDidLoad()
}
}
I want it to print "Hi" or something. I just want it to react to:
If the username is 'UK' and
If the username is not 'UK'.

Answer 1

You can just simply use == as follow
#IBAction func SignIn(_ sender: Any) {
if(Username!.text == "Hello" || Username!.text == "UK") {
print("Hi")
}
}
|| means OR
&& means AND
Hope this help!

Answer 2

You can do it in this way
#IBAction func SignIn(_ sender: Any) {
if Username!.text == "UK"
{
print("Hi")
}
else
{
// do your stuff
}
}
Moreover you can also use a variable to check whether a string contained in your textfield or not like this:
var Str = "UK"
if Str.contains(self.Username!.text!) {
print("Hi")
}
Extension way:
extension String {
func contains(find: String) -> Bool{
return self.range(of: find) != nil
}
}
var value = self.Username!.text // You can put value as of your textfield.text and then check
print(value.contains("UK")) // true
print(value.contains("THIS")) // false
if value.contains("UK") == true
{
print("Hi")
}
else
{
// do your stuff
}