Question

I would like to run the same code if the button on the alert is pressed, or the return key on the keyboard is pressed.

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
works for the OK button on the alert, but I can not find an equivalent for the return key.

I have been experimenting with - (BOOL)textFieldShouldReturn:(UITextField *)alertTextField, to no avail.

A year ago, three people in the comments on this site had the same problem and it was not answered:

How do you get the alertview to respond to a “Return” on the keyboard with the same result as tapping the “OK” button? I can’t seem to find anything for the iOS 5 SDK on Google.

What are all the steps necessary to accomplish this?

Edit:

More specifically:

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{

    [[NSUserDefaults standardUserDefaults] setObject:[alertView textFieldAtIndex:0].text forKey:@"url_preference"];
    [[NSUserDefaults standardUserDefaults] synchronize];
}

When the user presses OK, that code is run. What is the similar, simple equivalent for the Return key on the keyboard?

Currently, I am trying this:

- (BOOL)textFieldShouldReturn:(UITextField *)alertTextField {
    [alertTextField resignFirstResponder];
    NSLog(@"test");
    return YES;
}

Which does nothing.

This is the definition of my alert:

-(void) noUrl {

    UIAlertView * alert = [[UIAlertView alloc] initWithTitle:@"Add a URL" message:@"Change it later in Settings" delegate:self cancelButtonTitle:nil otherButtonTitles:@"Load",nil]; //If you change button name, change it in the other alertView function
    alert.alertViewStyle = UIAlertViewStylePlainTextInput;
    UITextField * alertTextField = [alert textFieldAtIndex:0];
    alertTextField.keyboardType = UIKeyboardTypeURL;
    alertTextField.returnKeyType = UIReturnKeyGo;
    alertTextField.enablesReturnKeyAutomatically = YES;
    alertTextField.placeholder = @"http://www.example.com";
    [alert show];
    return;

}

If code needs to be added in another file, or another place, I would appreciate detailed specifics.

Answer 1

Set

[alert textFieldAtIndex:0].delegate = self; 

and then implement

- (BOOL)textFieldShouldReturn:(UITextField *)alertTextField {//add any method you want to execute to here. This method will be called when user taps on the textfield in alertview.
 [alertTextField resignFirstResponder];// to dismiss the keyboard.
 [alert dismissWithClickedButtonIndex:0 animated:YES];//this is called on alertview to dismiss it.
}

Also put UITextFieldDelegate in your .h file as,

@interface CustomViewController : UIViewController <UIAlertViewDelegate, UITextFieldDelegate> 

As per the current edit in the question, you are missing,

alertTextField.delegate = self; 

Update:

Based on your comment, make alert as a class level variable as,

@interface CustomViewController : UIViewController <UIAlertViewDelegate, UITextFieldDelegate> {
  UIAlertView *alert;
}

Then change this method to,

-(void) noUrl {

   alert = [[UIAlertView alloc] initWithTitle:@"Add a URL" message:@"Change it later in Settings" delegate:self cancelButtonTitle:nil otherButtonTitles:@"Load",nil]; //If you change button name, change it in the other alertView function
   //rest of the code here...