if statement to see if a text field is empty

[Karl6669]

Hi, I have made a settings bundle for my app containing several NSStrings. I then have an if statement where I want it to do one thing if there is ANYTHING entered into that field, and something else if there is NOTHING in that field. Can't seem to get it to work properly though. Any tips?

    if ([[NSUserDefaults standardUserDefaults] stringForKey:(@"supervisor_email")]) {
        [supervisorsEmail setFont:[UIFont italicSystemFontOfSize:(8)]];
        [supervisorsEmail setText:[defaults stringForKey:@"supervisor_email"]];
    } else {
        [supervisorsEmail setTextColor:[UIColor redColor]];
        [supervisorsEmail setText:@"Not Set Yet"];
        UIAlertView *supervisorEmail = [[[UIAlertView alloc] 
                                         initWithTitle:@"SUPERVISOR'S EMAIL"
                                         message:@"You have not assigned a supervisor's email address yet.  This is required to email the report.  Please go to you iPhone settings."
                                         delegate:self 
                                         cancelButtonTitle:@"Dismiss"
                                         otherButtonTitles:nil] autorelease];
        [supervisorEmail setTag:4];
        [supervisorEmail show];
    };

I have also tried boolForKey, but, either way I do it, it always returns the same result. Any advice?

[imtz]

Try

NSString * supervisorEmail = [[NSUserDefaults standardUserDefaults] stringForKey:@"supervisor_email"];

if (supervisorEmail == nil || [supervisorEmail isEqualToString:@""]) {
    // String is Empty or doesn't exist.
}
else {
    // String is not empty.
}

[Maxner]

the ==nil wont work, but this will:


NSString * supervisorEmail = [[NSUserDefaults standardUserDefaults] stringForKey:@"supervisor_email"];

if ([supervisorEmail isEqualToString:@""]) {
//NSUSerDefaults is empty
}
else {
//NSUSerDefaults is not empty!
}

[BrianSlick]

Originally Posted by Maxner

the ==nil wont work

stringForKey:
Returns the string associated with the specified key.

- (NSString *)stringForKey: (NSString *)defaultName
Parameters
defaultName
A key in the current user's defaults database.
Return Value
The string associated with the specified key, or nil if the default does not exist or does not contain a string.

.

[Karl6669]

Originally Posted by BrianSlick

.

Thanks guys, I solved it slightly differently:

NSString *superEmail = [defaults stringForKey:@"supervisor_email"];
    if ([superEmail length] > 0) {
         //blah
    } else {
         do something else
    }