How to add textField in UIAlertController?

Question

I want to realize a function about changing password. It requires users to input their previous password in an alert dialog.

I want to click the button "Confirm the modification" then jump to the other view controller for changing password. I have written some code, but I don't know how to write in the next moment.

UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"Change password" message:@"Please input your previous password" preferredStyle:UIAlertControllerStyleAlert];

[alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
    textField.placeholder = @"please input your previous password";
    textField.secureTextEntry = YES;
}];

UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"cancel" style:UIAlertActionStyleCancel handlers:nil];

UIAlertAction *okAction = [UIAlertAction actionWithTitle:@"Confirm the modification" style:UIAlertActionStyleDestructive handler:*(UIAlertAction *alertAction) {
    if (condition) {
        statements
    }
}];

[alertController addAction:cancelAction];
[alertController addAction:okAction];
[self presentViewController:alertController animated:YES completion:nil];

Answer 1

You will get all added textfields from alert controller by its textFields readonly property, you can use it to get its text. Like

Swift 4:

let alertController = UIAlertController(title: "", message: "", preferredStyle: .alert)
alertController.addTextField { textField in
    textField.placeholder = "Password"
    textField.isSecureTextEntry = true
}
let confirmAction = UIAlertAction(title: "OK", style: .default) { [weak alertController] _ in
    guard let alertController = alertController, let textField = alertController.textFields?.first else { return }
    print("Current password \(String(describing: textField.text))")
    //compare the current password and do action here
}
alertController.addAction(confirmAction)
let cancelAction = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
alertController.addAction(cancelAction)
present(alertController, animated: true, completion: nil)

Note: textField.text is optional, unwrap it before using

Objective-C:

UIAlertController *alertController = [UIAlertController alertControllerWithTitle:@"" message:@"" preferredStyle:UIAlertControllerStyleAlert];
[alertController addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
    textField.placeholder = @"Current password";
    textField.secureTextEntry = YES;
}];
UIAlertAction *confirmAction = [UIAlertAction actionWithTitle:@"OK" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
    NSLog(@"Current password %@", [[alertController textFields][0] text]);
    //compare the current password and do action here

}];
[alertController addAction:confirmAction];
UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:@"Cancel" style:UIAlertActionStyleCancel handler:^(UIAlertAction * _Nonnull action) {
    NSLog(@"Canelled");
}];
[alertController addAction:cancelAction];
[self presentViewController:alertController animated:YES completion:nil];

By [[alertController textFields][0] text] this line, it will take first textfield added to the alerController and get its text.