How to check if the characters entered in the Swift Text Field are email addresses
How to check if the characters entered in the TextField are email addresses
This time, I would like to implement a method of conditional branching depending on whether the characters entered in the TextField are email addresses.
First of all, set up Label, TextField, Button
Then connect item and code
Add the code below
//Email address or not class
class func isValidMailAddress(_ string: String) -> Bool {
let mailAddressRegEx = "[A-Z0-9a-z._+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}"
let mailAddressTest = NSPredicate(format:"SELF MATCHES %@", mailAddressRegEx)
let result = mailAddressTest.evaluate(with: string)
return result
}
Connect Button with Touch Up Inside
I will write the code here
Last spurt!
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var Label: UILabel!
@IBOutlet weak var TextField: UITextField!
@IBOutlet weak var Button: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
//Email address or not class
class func isValidMailAddress(_ string: String) -> Bool {
let mailAddressRegEx = "[A-Z0-9a-z._+-]+@[A-Za-z0-9.-]+\\.[A-Za-z]{2,4}"
let mailAddressTest = NSPredicate(format:"SELF MATCHES %@", mailAddressRegEx)
let result = mailAddressTest.evaluate(with: string)
return result
}
@IBAction func ButtonTouchUpInside(_ sender: Any) {
//When the email address is correct
if ViewController.isValidMailAddress(self.TextField.text!) {
Label.text = "Correct email address"
//When the email address is incorrect
} else {
Label.text = "Please enter the correct email address"
}
}
}
Complete
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