Question

I want an alert when the following text fields receive the conditions in second section of code

self.circuit.rcdAtIan = [ICUtils nonNilString:self.rcdAtIan.text];
self.circuit.rcdAt5an = [ICUtils nonNilString:self.rcdAt5an.text];

The above code works fine so now I need to fire it. Using the below method was my first thought but that fires the alert on every keyboard resignation. I only want the alert to display once.

- (void)textFieldDidEndEditing:(UITextField *)textField {
    if ([_rcdAtIan.text intValue]> 200) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Warning" message:@"my message" delegate:nil cancelButtonTitle: @"Ok" otherButtonTitles: nil];
        [alert show];     
    }

    if ([_rcdAt5an.text intValue]> 40) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Warning" message:@"my message" delegate:nil cancelButtonTitle: @"Ok" otherButtonTitles: nil];
        [alert show];
    }
}

Im thinking maybe I need a bool with NSUserDefaults perhaps? but not sure how to implement that to check if the alert has been shown. Normally if I wanted an alert shown once I would do

 if (![@"1" isEqualToString:[[NSUserDefaults standardUserDefaults] objectForKey:@"alert"]]){
    [[NSUserDefaults standardUserDefaults] setValue:@"1" forKey:@"alert"];
    [[NSUserDefaults standardUserDefaults] synchronize];
    [alert show];

}

However in this instance, when the page is reloaded I want the alerts to be shown again and in any case im not sure if thats an efficient way to solve this

Answer 1

Don’t use NSUserDefaults, that would be inappropriate

in your @interface…

    @property (assign) BOOL freshAlert1;
    @property (assign) BOOL freshAlert2;

then something like this… (assuming ‘page is reloaded’ equates to your viewController coming back onscreen)

- (void)viewDidAppear
{
     self.freshAlert1 = YES;
     self.freshAlert2 = YES;

}

if (([_rcdAtIan.text intValue]> 200) && self.freshAlert1) {
    self.freshAlert1 = NO;
    ...
   }

 if (([_rcdAt5an.text intValue]> 40) && self.freshAlert2) {
    self.freshAlert2 = NO;

     ...
     }