Question

I have a UISwitch object in my .xib file. Its state is On by default. If the user switches it to Off, I want to ask if he’s sure, and if he clicks No – automatically switch it back to On.

So I set these outlet and action in my .h file:

@property (weak, nonatomic) IBOutlet UISwitch *campaignSwitch;
- (IBAction)checkCampaignSwitch:(id)sender;

This is the checkCampaignSwitch method:

- (IBAction)checkCampaignSwitch:(id)sender {
    if(self.campaignSwitch.isOn==FALSE)
    {
        [self allertMessage:@"Receive updates" :@"Are you sure you don't want
           to receive updates?" :@"No" :@"Yes"];
    }
}

This calls for method to display an Alert message with various parameters (title, text, cancel button and other button).

I also registered for UIAlertViewDelegate and in my .m file I’m trying to implement the clickedButtonAtIndex method like this:

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    switch (buttonIndex) {
        case 0:
            [self.campaignSwitch setOn:TRUE];
            break;

        default:
            break;
    }
}

I’m getting the Alert message, but nothing happens when I click the No button. Nor the Yes.
So how do I switch it back On?

Answer 1

Had to make sure the UIAlertView is delegated:

UIAlertView *displayMessage = [[UIAlertView alloc]
   initWithTitle:messageTitle
   message:alertMessage
   **delegate:self**
   cancelButtonTitle:cancelButton
   otherButtonTitles:otherButton,
nil];